Explore Scientific 82 Degree 11mm Eyepiece Review

I wish someone told me about the Explore Scientific 82 Degree 11mm Eyepiece when I began my astronomy journey. It could’ve made my experience more exciting, easier, and more meaningful. 

I used terrible eyepieces, and my telescope choice wasn’t exactly topnotch too. This made my experience so awful I quit observing for a few months.

Luckily, since then, I’ve tested good eyepieces and have completely fallen in love with astrophotography all over again.

In this review, we’ll be digging deeper into the Explore Scientific 82 Degree 11mm Eyepiece, and break down its features, benefits, and drawbacks so that you can make an educated decision about whether or not you should buy it.

Who is the Explore Scientific 82-degree 11mm Best Suited For?

This eyepiece is for folks who want something budget-friendly without having to give up great features such as great optics, waterproof & fog proof features, and compatibility with other focal extenders. 

It’s also an excellent piece to start with if you want to test the premium eyepieces without breaking your bank. Although there are other cheaper options, I prefer this eyepiece from Explore Scientific because it offers a great experience for beginners, intermediate, and experts so you’ll not be needing an upgrade soon. 

I began using this piece as a beginner, and although I have graduated to high-end pieces, I still use it once in a while. As a beginner, it allowed me to see everything I’ve been missing out on, and as a seasoned pro, it still checks most boxes when I use to evaluate an excellent eyepiece.

How is the Performance of the Explore Scientific 82-degree 11mm?

The ES 82-degree 11mm is a spectacular eyepiece for many galaxies and nebulas. It gives you a moderate magnification and a detailed view without reducing the brightness too much. 

For example, you get a reasonable image when viewing Jupiter, and it just doesn’t zip fast across the eyepiece. It also has excellent color detail, which makes the experience very exciting.

Unfortunately, although the eye relief is standard and it worked well for me, some users who wear glasses said they found it a little tight.   

To sum it up, although this eyepiece doesn’t have the same clarity as that of premium eyepieces such as the 17mm TeleVue Ethos, its performance is really great for the price.

What I like

Waterproof & fogproof

If you live at a place with a single-digit humidity, you’d care less about your lenses or mirrors fogging up. But those of us who live in high humidity areas really appreciate a fog-proof eyepiece. 

Fortunately, the ES 82-degree 11mm eyepiece uses argon gas instead of nitrogen which slows down the cooling and ultimately reduces the fogging effects. This works well because argon has larger molecules than nitrogen, which prevents it from leaking through the compromised seal. The fog proof really comes in handy during late-night observations when the temperatures drop. 

Additionally, the eyepiece has a waterproof feature, and while it doesn’t allow you to deep your eyepiece in water for hours, it can protect it for at least 30 minutes in water. A 30 minutes waterproof feature sounds insignificant until your toddler drops your eyepiece in water (I would know).

Focus on quality

I love that the eyepiece allows you to enjoy your observation without straining your eyes or causing eye fatigue. This means you can enjoy viewing for longer hours. 

The eyepiece also has an averted feature that you can use to view ‘more of the image’ or ‘through the image.’ This gives you a better view of the image, and a chance to fully observe it in all dimensions. 

82-degree AFOV

This should’ve actually been the first benefit on the list. The ultra-wide 82-degree AFOV allows you to open up the large galaxies, nebulas, and star clusters world. 

As I mentioned, I had only used ‘crappy’ eyepieces before buying the ES 82-degree 11mm, and so when I started using this eyepiece, it almost felt like the eyepiece wasn’t there. It was the first time I felt fully immersed and connected to the experience.

The eyepiece allows you to view even objects that are more than 3-degrees wide, and view an object for a longer period. 

Compatibility with focal extenders 

This isn’t necessarily a huge deal because it’s highly unlikely you’ll need any magnification with the 11mm. Besides, if you push it too far, you’d end up seeing a lot less. 

However, if you’d like to increase magnification by 2X or even 5X, you can do it with the help of the Scientific’s Focal Extenders. 

What I don’t like

Here are some of the setbacks of purchasing the ES 82-degree 11mm. 

A poor warranty policy 

You never know what to expect when buying an eyepiece, and it’s always comforting to know you’re somewhat covered. 

Unfortunately, the Explore Scientific Store only offers a one-year warranty, which is a turn-off based on the money you’re spending on the eyepiece. 

It’s a little tight for people with glasses

While the eye relief is good, it can be a little tight for people with glasses at 15.6mm. That said, you can always find an eye box to maximize the exit pupil for an ultra-wide field of view at high magnification. 

It’s pricey 

Although the eyepiece has good optics and a wider POV, many people still feel it’s a bit pricey. You can get the same quality while using other eyepieces such as the Celestron XCel eyepiece, with the only con being a narrow view, at a third of the price. 

Frequently Asked Questions

Here are some of the central questions about the ES 82-degree 11mm Eyepiece

Are the Glass Edges on the Explore Scientific Eyepiece Blackened?

Yes, the interior of the eyepiece has a black finish which helps in controlling light scattering and improving contrast. 

What is the Barrel Size of the ES 82-degree 11mm Eyepiece?

The eyepiece has a barrel size of 12.5 inches, and it effortlessly fits 1.25 focusers and inserts. 

Is the Explore Scientific 82-degree 11mm Eyepiece Compatible with Any Telescope?

Thanks to its barrel size, the eyepiece is compatible with many telescopes, including SCTs, refractors, and Newtonians. 


There are a lot of eyepieces in the market, and getting the right one can feel like looking for a needle in a haystack. It took me a long time, and it almost made me quit on my passion. 

There is also the question of price because you don’t want to end up broke from an eyepiece. The ES 82-degree 11mm Eyepiece gives you the perfect balance – it’s in the premium eyepiece entry-level, and comes at an affordable price.

I hope you got great insights into the ES 82-degree 11mm Eyepiece from my review. If you still have any questions, go ahead and ask in the comment section. 

You can check out the current price of the Explore Scientific 82 Degree 11mm Eyepiece on Amazon.

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