Explore Scientific 72° ED Series 8.5mm Waterproof Eyepiece
SKU: 38346887155

Explore Scientific 72° ED Series 8.5mm Waterproof Eyepiece

Sale price$134.55 Regular price$149.50
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Description

Explore Scientific 72° ED Series 8.5mm Waterproof EyepiecePlssl and Kellner eyepieces shipped with most telescopes get the job done, but they leave performance on the table narrow apparent fields, limited eye relief, and visible chromatic aberration at the field edge. The Explore Scientific 72 ED Series 8. 5mm Waterproof Eyepiece is a genuine HOYA FCD1 extra low dispersion glass eyepiece with a 72 apparent field of view, waterproof argon purged construction, and long eye relief a meaningful optical upgrade

Plössl and Kellner eyepieces shipped with most telescopes get the job done, but they leave performance on the table — narrow apparent fields, limited eye relief, and visible chromatic aberration at the field edge. The Explore Scientific 72° ED Series 8.5mm Waterproof Eyepiece is a genuine HOYA FCD1 extra-low dispersion glass eyepiece with a 72° apparent field of view, waterproof argon-purged construction, and long eye relief — a meaningful optical upgrade that transforms what you see through your telescope.

The FCD1 ED glass sharply reduces chromatic aberration compared to standard eyepiece designs, producing cleaner star points and higher contrast across the field. The 72° apparent field of view is wide enough to create a panoramic, immersive viewing experience without the weight and expense of ultra-wide designs. Argon purging prevents internal fogging in humid conditions, and the waterproof housing means dew-soaked nights won't damage the optics.


Key Features
  • HOYA FCD1 extra-low dispersion glass — reduced chromatic aberration for sharper, higher-contrast views
  • 72° apparent field of view — immersive wide-field viewing without tunnel vision
  • Waterproof and argon-purged — sealed against moisture, fog-proof in all conditions
  • Long eye relief — comfortable extended viewing for both eyeglass wearers and unaided observers
  • 1.25" barrel — standard format compatible with most telescope focusers
  • Enhanced multi-layer deposition coatings on all air-to-glass surfaces for maximum light transmission

Ideal For

High-magnification planetary observation with slightly more field than shorter focal lengths. An excellent upgrade from stock Plössl eyepieces for observers who want wider fields, better eye relief, and the optical clarity that ED glass provides. Compatible with any telescope accepting 1.25" eyepieces.

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SKU: 38346887155

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Momx4
New York, US
★★★★★ 5
Just what a gamer needs!
Format: Paperback
Perfect gift for my son!
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Reviewed in the United States on May 26, 2015
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Mick Charles Beaver
Whiting, US
★★★★★ 2
would have been better as a blog
Format: Paperback
First off, I have read over half of this book, but ultimately decided to put it down because it had a low signal-to-noise ratio. If the second half is filled with magic, I apologize in advance. What I liked: * The author is very honest. He does not shy away from discussing his failures (and successes). * The postmortem on the game "Life of Pixel" was especially good. * Interviews from various indie studios are sprinkled throughout. What I did not like: * A number of pieces of information were already out-of-date. This makes me think that the concepts should have been discussed at a higher level. For example, specifics about game engine costs are discussed. These numbers have changed since E3 of this year. Definitely recheck any information before formulating a plan based on the book's recommendations. * The indie studio interviews are a wasted opportunity in that they each interview has the same set of questions. It's like a questionnaire was sent out via email and the responses were pasted into the book. * When discussing commercial options, such as engines or other software packages, blurbs once again appear to be cut-and-pasted (this time verbatim from the package's web site). * Some of the advice is too broad and too light. For example, when writing about how to create a press release, the author discuss how to write in the active voice. I'm frankly not looking for writing tips in my Indie Game Developer Handbook. * The book is filled with tons of web links. My paperback copy was not so useful here. I ultimately left the book with the impression that the information would have been much better in the form of a blog. The author could have really gone in depth with the parts of the book that shined while keeping the surveys of topics in a form that serves them better (i.e. web links on the web).
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Reviewed in the United States on April 28, 2015
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Meridian
Battle Creek, US
★★★★★ 5
Helpful information and Questions to consider
Format: Paperback
As a writer of science fiction and fantasy I had already looked into the physical aspects of the worlds I was creating, but I quickly realized I needed to include society and culture in the worldbuilding. I started a search for information, questionairres, or guidelines to use and found very little that would be helpful to me as a writer. Until I came across this book. It's exactly what I needed. It touches on multiple aspects of beliefs and practices and asks questions to help you think through what you want for your worlds, even if it's mostly backgroud. A very useful tool.
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Reviewed in the United States on May 26, 2024
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Amazon Customer
Cuba, US
★★★★★ 3
Great Value for Book
Format: Paperback
Substantially cheaper than Barnes and Noble! Good read. Got alot of ideas! Hint ALWAYS check online for a cheaper price typically i he found books 35 to 50 % cheaper.
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Reviewed in the United States on July 27, 2025
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laughingant
Fort Morgan, US
★★★★★ 5
Good book
Format: Hardcover
Well-written and a great read for children who are fans of the animated series.
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Reviewed in the United States on March 24, 2026

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