SVBONY 25mm Telescope Eyepiece, Large Aperture Eyepiece, 40 Degree Field of View Plossl Eyepiece with Filter Threaded for Observing Moon Planetary Binary

I didn't pay very much for this eyepiece, so I was really surprised to see how good it was for the money. I bought it primarily for stargazing. I wanted to bring the power on my 70mm Celestron spotting scope down to 10X (the longest focal length stock eyepiece it came with was 20mm, or 20X). This eyepiece produces a clear, sharp edge-to-edge image of stars, with no signs of optical aberrations. I tested it during the day for terrestrial viewing and found it to produce a sharp image as well. I'm also really pleased with the wide field of view. Good eyepiece!

Great Product

Great value! But beware, this focal length won't work well for fast scopes with large obscurations! Optical reality, not the fault of the eyepiece. For example - a 6" F4 Newtonian. The magnification will be 15X and the exit pupil diameter 10mm! A typical eye pupil is only 6mm, so you get the center obscuration black out. About the fastest F-number this works well with is F6 or F7.

Purchased this for a 4 inch Dobsonian. Great view out of an old reflector. Not quite as good as a Televue in my 8 inch Meade, but it's hard to tell the difference unless you know what to look for. This is a great eyepiece and I don't have to worry about the kids dropping a high dollar eyepiece. Would recommend these and would buy again.

Impressive quality as to materials and build. Solid metal and multi-coated glass. Blackened internally to reduce stray light reflections. I have yet to view through it in the field, but am very confident that I will be very pleased, based on a thorough review by my highly trusted and very reliable YouTube reviewer, Jason of Small Optics. I purchased a second one for my neighbors, who are giving their young daughters a Celestron beginners' refractor telescope for Christmas 2023. A 40mm eyepiece is a great tool to be used with the stock eyepieces of any beginner scope or with more advanced scopes, as it provides a wider view of the sky. That wider view enables one to be well-oriented as to where to look and move the scope for bringing desired viewing targets into the center of the telescope's view. Then, one can simply lock the scope to that position, then replace the 40mm eyepiece with a 25mm, 10mm, etc. for greater magnification of the desired target, loosen locks of telescope, and off to viewing the target close up with the more powerful stock eyepiece. Alternatively, the 40mm can help provide beautiful sweeping vistas for those who enjoy simply scanning the night sky full of many more beautiful stars, planets, and clusters, etc. than the naked human eye can ever detect.

I recommend it 100% sharpness is 100% high definition..

Good eyepieces considering the low cost, but too much vignetting for my Denk binoviewers in a 900mm FL 120 refractor. This is not a problem with the eyepiece pair. I was just pushing the limit for widest FOV and looking for lowest mag, but it didn't work.

An inexpensive eye piece that provides excellent viewing.