7 Best Portable Telescopes of 2026; Reviews

Disclosure: This post contains affiliate links and I may earn a small commission (at no extra cost to you) if you click through and make a purchase. Thanks in advance – I really appreciate it!

Here in this article we’ve rounded up 7 of the best portable telescopes of various types, specifications, and budget. Below, you’ll find in-depth reviews of each, as well as an elaborate buying guide to help you pick out your best portable telescope.

Our Top 3 Picks

best portable telescope

Best Portable Telescope

With so many models with so many features available today, it can be a tedious task to find the best telescope that suits you.  We have analyzed the features ( aperture, focal length, ratio, portability etc.) that make the best travel telescope to help you pick out the one that is best for you.

1. Celestron Travel Scope 70DX Portable Refractor Telescope

Celestron Travel Scope 70DX Portable Refractor Telescope – 70mm Aperture, Fully-Coated Glass Optics – Includes Bonus Phone Adapter, Backpack & More – Ideal for Beginners & Travel
  • BRIGHT, SHARP VIEWS ANYWHERE: Unlike many beginner telescopes, this quality refractor features fully coated glass lenses and a 70mm aperture for crisp, clear views of the Moon, planets, and daytime scenery—all in a lightweight, travel-ready design.
  • PERFECT FIRST TELESCOPE FOR BEGINNERS: Designed for adults and kids to enjoy together, this beginner-friendly telescope sets up in minutes and delivers rewarding views with no prior experience required.
  • EASY NO-TOOL SETUP: No complicated assembly or tools needed. The full-height tripod and telescope tube set up in seconds and pack neatly into the included backpack—so you’re always ready to observe on the go.
  • DUAL EYEPIECES FOR VERSATILE VIEWS: Includes 20mm and 10mm eyepieces for wide and close-up views of celestial and terrestrial targets. Spot craters on the Moon at night or wildlife during the day.
  • BACKPACK AND SOFTWARE: Includes a padded backpack with room for accessories, a finderscope, star diagonal, eyepieces, and a free download of Starry Night software to help you identify celestial objects and plan your next stargazing session.

The Celestron Travel Scope 70 DX is a standout pick in the portable telescope category, especially for beginners and casual skywatchers who want a ready-to-use setup without heavy gear. It features a 70 mm fully-coated glass objective lens that delivers bright and relatively sharp views of lunar craters, star clusters, and brighter planets, as well as terrestrial subjects during the day. The optics and compact design make it easy to carry and enjoyable for travel or backyard stargazing.

What makes this telescope particularly user-friendly is the complete all-in-one kit — it includes two eyepieces for different magnifications, a finderscope for easier aiming, a smartphone adapter and Bluetooth shutter remote for capturing images, and a custom backpack for transport and storage. Setup is tool-free and intuitive, so even first-time users can have it ready in minutes. This blend of portability and convenience is ideal for families, campers, or anyone dipping their toes into astronomy without wanting complex equipment.

No telescope is perfect, and some users point out that at higher magnifications the stability of the tripod can be a limitation, and the basic mount requires patience to keep targets in view. However, for its price and purpose — a lightweight, beginner-friendly telescope that travels well — the Travel Scope 70 DX delivers solid performance and memorable viewing experiences for its class.

2. Gskyer 70 mm AZ Mount Refractor Telescope

Sale
Gskyer Telescope, 70mm Aperture 400mm AZ Mount Astronomical Refracting Telescope for Kids Beginners - Travel Telescope with Carry Bag, Phone Adapter and Wireless Remote.
  • Superior Optics: 400mm(f/5.7) focal length and 70mm aperture, fully coated optics glass lens with high transmission coatings creates stunning images and protect your eyes. Perfect full positive telescope for astronomers to explore stars and moon.
  • Magnification: Come with two replaceable eyepieces and one 3x Barlow lens.3x Barlow lens trebles the magnifying power of each eyepiece. 5x24 finder scope with mounting bracket and cross-hair lines inside make locating objects easily.
  • Wireless Remote: This refractor telescope includes one smart phone adapter and one Wireless camera remote to explore the nature of the world easily through the screen and take amazing celestial images.
  • Adjustable Tripod: This telescope allows for many different viewing positions with a adjustable aluminum alloy tripod and a carry bag, the telescope and tripod can fit inside the bag for easy traveling and storage.
  • Satisfaction: Buy with confidence from a leading manufacturer.

The Gskyer 70 mm AZ Mount Refractor Telescope is a compact, beginner-friendly portable telescope that offers good value for its price point, especially for kids and casual skywatchers. It features a 70 mm aperture and 400 mm focal length with fully coated glass optics that deliver bright views of the moon, stars, and terrestrial scenes. The included 5×24 finderscope, two eyepieces, and a 3× Barlow lens let you easily switch between magnifications, making it simple for newcomers to explore both lunar details and brighter celestial objects.

What sets this telescope apart at its price is the all-in-one kit it arrives with: an adjustable tripod, smartphone adapter and wireless remote, carry bag, and accessories that make setup and use more convenient. Beginners appreciate being able to take it out, assemble it in a few minutes, and start observing without needing extra purchases. The portability and included gear also make it a fun choice for outdoor trips, backyard stargazing, or daytime nature viewing.

While expectations should be realistic — this isn’t a high-end instrument — most owners find it useful as a first telescope and a great way to spark interest in astronomy. Some users note that the tripod can feel lightweight and that performance is limited under higher magnifications, but for a beginner model designed for ease of use and portability, it consistently earns positive feedback for introducing people to the sky without overwhelming them with complexity.

3. Celestron Travel Scope 80mm Portable Telescope

Sale
Celestron Travel Scope 80 Portable Refractor Telescope – 80mm Aperture, Fully-Coated Glass Optics – Includes Tripod, Smartphone Adapter, Backpack & Software – Ideal for Beginners & Travel
  • BRIGHT, SHARP VIEWS ANYWHERE: Unlike many beginner telescopes, this quality refractor features fully coated glass lenses and a 80mm aperture for crisp, clear views of the Moon, planets, and daytime scenery—all in a lightweight, travel-ready design
  • PERFECT FIRST TELESCOPE FOR BEGINNERS: Designed for adults and kids to enjoy together, this beginner-friendly telescope sets up in minutes and delivers rewarding views with no prior experience required
  • EASY NO-TOOL SETUP: No complicated assembly or tools needed. The full-height tripod and telescope tube set up in seconds and pack neatly into the included backpack—so you’re always ready to observe on the go
  • DUAL EYEPIECES FOR VERSATILE VIEWS: Includes 20mm and 10mm eyepieces for wide and close-up views of celestial and terrestrial targets. Spot craters on the Moon at night or wildlife during the day
  • BONUS BACKPACK AND SOFTWARE: Includes a padded backpack with room for accessories, a finderscope, star diagonal, eyepieces, a smartphone adapter, and a free download of Starry Night software to help you identify celestial objects and plan your next stargazing session

The Celestron Travel Scope 80mm Portable Telescope is a standout choice for anyone wanting a lightweight, go-anywhere telescope that’s easy to set up and use right out of the backpack. With its 80 mm aperture and fully-coated glass optics, this refractor delivers bright, crisp views of the Moon, star clusters, and even brighter deep-sky objects, while also working well for daytime terrestrial viewing. It comes as a complete kit with two eyepieces (20 mm and 10 mm), a finderscope, erect-image diagonal, and smartphone adapter, making it exceptionally beginner-friendly and versatile.

Portability is where this model really shines — the entire setup weighs just around 4.5 lbs and fits neatly into the included custom backpack, so it’s ideal for travel, camping, or backyard stargazing. Setup is tool-free and intuitive, and the adjustable tripod lets you find a comfortable viewing height quickly. The smartphone adapter is a fun addition that lets users try basic astrophotography or capture scenic daytime views through their phone’s camera.

While most users enjoy the ease of use and optical performance for the price, there are a few small trade-offs — the included tripod and finderscope are decent for casual observing but not as rugged as higher-end gear, and aligning the smartphone adapter can take patience. Still, for a portable, beginner-oriented telescope that performs well for both sky and land observation, the Travel Scope 80 delivers excellent value and a rewarding first-telescope experience.

4. HUGERSTAR 80 mm Portable Refractor Telescope

Sale
HUGERSTAR Telescope, Telescope for Adults & Kids & Astronomy Beginners, 80mm Aperture 600mm Portable Refractor Telescopes Fully Multi-Coated Optics with AZ Mount Tripod, Phone Adapter and Moon Filter
  • Superior Optics: This telescope features a large 80mm aperture and 600mm focal length for bright, wide-field views. Fully multi-coated lenses enhance light transmission and reduce glare - Ideal for astronomy at night and nature observation by day
  • Optimum Magnification: This telescope for adults, kids, and beginners includes 25mm & 10mm eyepieces and a 3X Barlow lens, offering 24X-180X magnification. A 5X24 finder scope for fast targeting. Perfect for moon, birding, wildlife, scenery & stargazing
  • Convenient Accessories: Comes with a sturdy aluminum tripod (adjustable from 21.2-44 inches) for stable viewing angles, a phone adapter for capturing and sharing images, and a moon filter reduces glare and improves contrast, making lunar viewing clearer and more comfortable
  • Easy Setup & Portable: This refractor telescope offers a simple, no tools setup - 90% of users are ready in 10 minutes. Includes clear instructions. Lightweight and compact with a carry bag for travel. Perfect for beginners to enjoy backyard stargazing, camping, hiking, or wildlife viewing anytime, anywhere
  • Satisfaction: Trusted by thousands of satisfied stargazers, the HUGERSTAR portable telescope inspires curiosity in science and astronomy, perfect for kids and beginners. A great choice for family bonding and learning, making exploration fun and memorable

The HUGERSTAR 80 mm Portable Refractor Telescope is a great entry-level telescope that blends ease of use with surprisingly capable optics for the price. It features an 80 mm aperture and 600 mm focal length that gather plenty of light for bright, wide-field views of the Moon, star clusters, and even some terrestrial scenery during the day. The fully multi-coated lenses help increase light transmission and reduce glare, which improves image clarity across a range of viewing conditions — a real plus for beginners exploring astronomy for the first time.

What makes this model stand out for casual observers and families is the all-in-one kit it arrives with. The package typically includes two eyepieces for multiple magnifications, a 3× Barlow lens, a 5×24 finderscope for easier target acquisition, and an adjustable aluminum tripod that keeps the telescope steady under various heights. Added accessories like a smartphone adapter and moon filter make it easier to capture images and enjoy clearer views of bright lunar features without glaring. For backyard stargazing, camping, or basic daytime nature viewing, this setup is both convenient and versatile.

Of course, it’s not a high-end instrument, and some users note that the tripod and mount are more suited to casual use than heavy-duty astronomy gear. But for those just getting started or looking for a lightweight, portable telescope that doesn’t require extra purchases to begin observing, the HUGERSTAR 80 mm delivers excellent value and enjoyable views of the night sky.

5. Dianfan 90 mm Telescope

Sale
Dianfan Telescope, 90mm Aperture 550mm - Astronomical Telescope for Adults High Powered,Portable Telescopes Fully Multi-Coated High Transmission with Tripod, Phone Adapter, Carrying Bag, Folding Stool
  • High-Quality Optics: The Dianfan 90×550 astronomical telescope features a 90mm aperture and a 550mm focal length.The telescope features fully multi-coated optics for high light transmission and brighter, clearer images.Perfect for beginners and experienced stargazers to explore the wonders of the night sky
  • Powerful Magnification: Equipped with two eyepieces and a 2× Barlow lens, this telescope offers magnification ranging from 22× to 165×. It provides detailed lunar views, allowing you to observe craters, lunar seas, and other fascinating surface features. A great high-powered telescope for adults and astronomy enthusiasts
  • Easy to assemble and use: Designed with a user-friendly structure, this telescope can be set up in about 15 minutes, even for first-time users.Clear assembly instructions and quick-release components ensure an easy and straightforward setup.The intuitive design lets beginners focus on exploring the night sky instead of dealing with complex installation
  • Comprehensive Kit & Portability: This telescope set includes a finderscope, phone adapter, carry bag, and folding stool for versatile use. The sturdy, custom-fit carrying bag allows for easy transport and storage while protecting the telescope. The folding stool provides comfort during observation, helping to avoid discomfort from prolonged bending or squatting, and offering convenience for outdoor stargazing.The folding stool is suitable for children or adults under 198 lb (90 kg) for short-term observation
  • Professional Astronomical Telescope: The Dianfan 90×550 telescope combines quality, functionality, and reliability. It delivers high-resolution views that bring the universe closer. Designed for both adults and kids, this high-powered telescope inspires curiosity in astronomy and science while encouraging exploration of the night sky. It is also ideal for stargazing, bird watching, wildlife observation, and city landscape viewing

The Dianfan 90 mm Aperture × 550 mm Telescope is a powerful yet surprisingly approachable portable telescope that’s ideal for beginners and casual stargazers seeking clearer and brighter views of the night sky. Its 90 mm aperture paired with fully multi-coated optics helps gather plenty of light for detailed lunar observations and brighter celestial objects, while also offering enjoyable daytime terrestrial viewing. The included finderscope and multiple eyepieces make it easy to switch magnifications depending on what you’re observing, and the overall optical quality rivals many other budget-friendly telescopes in its class.

One of the standout features of this model is its complete accessory kit. It typically ships with a sturdy tripod, phone adapter, carry bag, and even a folding stool, making it a genuinely portable package for backyard, camping, or travel use. The setup is intuitive and can be completed in about 10–15 minutes, even for first-time users — a big plus for anyone who wants to spend more time observing and less time assembling. The carry bag and reasonably lightweight design also make it easy to take this telescope wherever your sky-watching adventures lead.

Of course, this isn’t a professional-grade instrument, and some components like the tripod or plastic parts may feel less premium than higher-end models. Even so, for the price and convenience, the Dianfan 90 mm telescope delivers solid performance and memorable views that are perfect for new astronomers exploring the stars or learning celestial basics. Its combination of strong optics, ease of use, and portability makes it one of the more compelling beginner telescopes in the portable category.

6. HEXEUM 80 mm Astronomical Telescope

Sale
Telescope 80mm Aperture 600mm - Astronomical Portable Refracting Telescope Fully Multi-coated High Transmission Coatings AZ Mount with Tripod Phone Adapter, Wireless Control, Carrying Bag. Easy Set Up
  • Optimum Magnification: Our telescope for kids and adults is quipped with two replaceable excellent-quality eyepieces (25mm and 10mm) for 24X and 60X magnification. 3x Barlow lens trebles the magnifying power of each eyepiece. magnificate moon up to 72 or 180 times. Also with 5x24 finder scope makes locating objects easy.
  • Excellent Quality Optics: This telescope is 600mm(f/6.7) focal length and 80mm aperture, 80mm aperture to capture more light picture and multi-fully high transmission coated all-optical lens enhance image brightness and clarity X
  • Portable And Convenient: Comes with a phone adapter and an adjustable aluminum tripod. Wireless remote control and carrying bag make it easier for you portable and capture amazing images.
  • Easy To Set Up: In order to save your time. Even for novices, no tools are required to set up the telescope. quick and easy to focus. Truly realize a no-tool-set telescope
  • Satisfaction Quality: Lifetime maintenance. If you have any questions about the product and service, please feel free to contact us, we will do our best to help you in 24 hours

The 80 mm Aperture 600 mm Astronomical Telescope is a solid portable option for beginners who want a noticeable step up from smaller entry-level scopes without sacrificing ease of use. The 80 mm aperture gathers enough light to deliver bright, satisfying views of the Moon, planets like Jupiter and Saturn, and larger star clusters, while the 600 mm focal length strikes a good balance between magnification and field of view. Fully coated optics help improve contrast and clarity, making this telescope enjoyable for both nighttime stargazing and daytime terrestrial viewing.

This telescope is designed with simplicity and convenience in mind. It typically comes as a complete starter kit, including multiple eyepieces, a finderscope for easy target alignment, an adjustable tripod, and often a smartphone adapter for casual astrophotography. Assembly is straightforward and beginner-friendly, allowing new users to start observing quickly without needing additional accessories or technical knowledge. Its relatively lightweight build makes it easy to move around the backyard or pack for short trips.

While it’s not meant for advanced astrophotography or high-power deep-sky observing, this model performs very well within its intended role. The tripod and mount are adequate for casual use, though some vibration at higher magnifications is expected at this price point. Overall, the 80 mm 600 mm portable telescope offers excellent value for beginners and families looking for a capable, easy-to-use telescope that delivers rewarding views without complexity.

7. UncleHu 150EQ Newtonian Reflector Telescope

UncleHu 150EQ Newtonian Reflector Telescope for Adults High Powered, Professional Equatorial Telescopes for Adults Beginners with Portable Carry Bag, Phone Adapter, Stainless Steel Tripod, Moon Filter
  • 150mm Large-Aperture Newtonian Reflector — Bright, Detailed Views: This 150mm Newtonian reflector with a 650mm focal length gathers ample light to deliver sharp, high-contrast views of the Moon, planets, and deep-sky objects. It’s an excellent choice for beginners and families looking for a capable first telescope, while also offering performance that meets the needs of users seeking an upgrade. The sleek, modern design adds a refined touch to any observing setup.
  • Equatorial Mount for Accurate Tracking — Fine RA/DEC Control: The equatorial (EQ) mount aligns with Earth’s rotation, enabling smoother and more intuitive tracking of celestial objects. The latitude adjustment screw helps you fine-tune the viewing angle, while dual slow-motion control cables allow precise Right Ascension and Declination adjustments to keep your target centered throughout your observation.
  • Stable Stainless Steel Tripod with Counterweight: The reinforced stainless steel tripod provides rigid, low-vibration support with an adjustable height range of 48.4–66.2 in (123–168 cm) for users of all ages. The counterweight balances the telescope tube for steadier, clearer views. The accessory tray keeps your accessories organized and within easy reach.
  • Portable Carrying Bag — Safe Storage & Travel-Ready Design: The padded carrying bag protects all components while keeping everything neatly organized for worry-free storage. Easy to carry, it’s great for backyard observing, camping trips, school events, and dark-sky adventures. Enjoy astronomy anywhere with a setup that travels as easily as you do.
  • Complete Accessory Kit — Easy Setup & Versatile STEM Learning: This telescope includes a detailed printed manual and requires no tools for quick assembly. 25mm and 10mm eyepieces plus a 2× Barlow lens for 26×–130× magnification, allowing easy switching between wide-field views and detailed close-ups. (Notice: This telescope may include one of two eyepiece sets; both versions are fully tested and deliver the same optical performance.) The 5×24 finder scope helps you locate and center targets quickly, the moon filter reduces glare for improved lunar contrast, and the phone adapter lets you capture and share memorable moments. Everything you need to begin exploring the night sky is included.

The UncleHu 150EQ Newtonian Reflector Telescope brings serious stargazing power to the portable telescope category with its large 150 mm aperture and 650 mm focal length, designed to gather plenty of light for bright, high-contrast views of the Moon, planets, and many deep-sky objects. This makes it a compelling choice for beginners who want to go beyond basic views and explore the night sky’s richer details without stepping up to bulky, expensive gear. The Newtonian reflector design paired with fully capable optics helps deliver impressive clarity for its class.

What sets this model apart from simpler scopes is its equatorial (EQ) mount, which allows smoother tracking of celestial objects as they move across the sky. With dual slow-motion control cables and adjustable latitude settings, observers can fine-tune their view and keep objects centered longer — a feature usually found on more advanced telescopes. The listing also notes a sturdy stainless-steel tripod, counterweight for balance, and a padded carrying bag, making setup and transport easier for backyard sessions or trips to darker skies.

The accessory kit rounds out a beginner-friendly experience, including multiple eyepieces for varying magnification, a Barlow lens to extend range, a moon filter to reduce glare, a finderscope to help aim at targets, and even a phone adapter for casual astrophotography. While it’s not as compact as smaller refractors, its performance and feature set offer excellent value for budding astronomers who want clearer detail on moons, planets, and brighter deep-sky objects without a steep learning curve.

Best Portable Telescope - Buying Guide

Telescopes are an incredible door to the heavens, for anybody intrigued by space and astronomy.

thebigbangoptics

Features To Consider When Buying A Portable Telescope

Aperture

The aperture of a telescope refers to the diameter of either the objective lens of a refractor or objective mirror of a reflector.

The aperture size is the true key to the “power” of a telescope—its size is directly proportional to the scope’s ability to gather light. And the more light a scope can gather, the better the image an observer will see.

However, that doesn’t mean you should simply buy the telescope with the largest aperture you can find. If your scope is inconveniently large, you are less likely to use it, let alone travel with it.

Typically, 2.4-inch (60-millimeter) and 3.1-inch (80-millimeter) refractors and 4.5-inch (114-millimeter) and 6-inch (152-millimeter) and 8-inch reflectors are popular for amateurs.

All the telescopes in our list above are 8-inches and below.

Focal Ratio

This is the ‘speed’ of a telescope’s optics, found by dividing the focal length by the aperture. The smaller the f/number, the lower the magnification, the wider the field, and the brighter the image with any given eyepiece or camera.

Fast f/4 to f/5 focal ratios are generally best for lower power wide field observing and deep space photography. Slow f/11 to f/15 focal ratios are usually better suited to higher power lunar, planetary, and binary star observing and high power photography. Medium f/6 to f/10 focal ratios work well with either.

Focal Length

Focal length refers to the distance between the primary lens/mirror and the point where the object is brought into focus.

The focal length is important, because it’s a factor in how well a telescope magnifies objects. To figure out the magnification, divide the focal length of the telescope by the focal length of the eyepiece: If you have a 25-millimeter eyepiece and a refractor of 1000 mm, the magnification is 40 power, written as 40x (or, 1000 / 25 = 40).

To avoid fuzziness, make sure to magnify a telescope to no more than twice the aperture of your telescope in millimeters (or 50 times the aperture in inches).

Mount

The Mount is what the OTA is attached to and is responsible for the how the user aligns, moves, and tracks celestial objects.

There are three principal types of mounts: Alt-Azimuth (AZ or Alt-Az), German Equatorial (EQ), and Motorized. Motorized mounts can be of either Alt-Az or EQ, but are usually set aside to differentiate them from manual mounts.

An altazimuth mount can be moved up and down and side to side, and usually requires you to make manual corrections when you’re watching an object move across the sky.

A better option can be an equatorial mount, with one axis aligned parallel to the Earth’s axis of rotation. If you live in the Northern Hemisphere, you orient an equatorial by pointing at the North Star, Polaris.

More sophisticated users may want computerized or GoTo mounts, which can automatically move in the right direction to track objects in the sky.

Usually, you need to input the date, time and location of your session before starting. Some systems require you to point the telescope at two or three bright objects in order to calibrate it.

Eyepieces

Any new telescope should have at least one eyepiece, and some sets come with two or three. An eyepiece is rated by millimeters, with smaller numbers indicating higher magnification. A 25-millimeter eyepiece is common and appropriate for most stargazers.

It’s important to remember that while a higher-magnification eyepiece may provide more details, it can be harder to keep an object in view.

To get the steadiest seeing in such cases, you may need to use a motorized mount. A lower-power eyepiece makes it easier to find objects and keep them in view. It will also require less light, so viewing dimmer objects is easier.

High- and low-power eyepieces each have their place in observing, so their value depends on the interests of the stargazer.

Types Of Telescopes

While telescopes come in many different forms, there are three general types to choose from.

There are refractors, which collect light with lenses; reflectors, which use mirrors; and compound telescopes, which are hybrids of the two.

Refractors feature a lens at the front of the telescope’s tube. They don’t require much effort to maintain, but they get expensive as the size of the lens gets bigger. There are two main types of refractors: apochromatic and achromats. You should use apochromats because they offer better optical quality, even though they are more expensive, Sky & Telescope said.

Reflectors are a more affordable option than refractors, but they require more maintenance, because their optics can fall out of alignment. To gather light, reflectors use a curved mirror at the back end of the telescope’s main tube.

Compound telescopes use both lenses and mirrors to gather light, and they’re quite portable, because their tubes are more compact and lighter. The most popular designs are Schmidt-Cassegrains and Maksutov-Cassegrains.

Conclusion

The Celestron – 70mm Travel Scope  is our top pick for beginners who are looking to buy their first travel telescope.

The Celestron Travel Scope 70mm f/5.7 AZ Refractor Telescope Kit is designed for portability and ease of use for both astronomical and terrestrial use.

ABOUT US

We are a team of active amateur astronomers, here to help you with all your astronomy and science related needs – this is anything, from reviewing the latest telescopes to be released to talking about gravity and neurons. The Big Bang Optics was started because of our love for astronomy and to help others like us find the best telescope and accessories.

LEGAL DISCLAIMER

The Big Bang Optics is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. The Big Bang Optics also participates in affiliate programs with Clickbank and other sites. The Big Bang Optics is compensated for referring traffic and business to these companies.