Baader 31 mm Hyperion Eyepiece - Black

The product is a quality high power eyepiece and is worth adding to your collection. Well worth the cost and has a good field of view for the planets and even small deep sky objects. A good purchase.

Update 1/15/19I recently spent an entire evening looking at the moon, M42, Betelgeuse, Rigel and Mars with a variety of eyepieces, my fantasy of looking elsewhere shattered by clouds. I compared the Baader Hyperion Aspheric with shorter focal length eyepieces with comparable fields of view, an unfair comparison, but so be it. The telescope was a well-calibrated f6 8" with a finely honed Pegasus primary (Strehl ~ 0.99) and a 1/30th wave secondary from Protostar. The scope and EPs cooled outside from late afternoon. Seeing was average from my relatively dark backyard site.On axis, the 31mm Hyperion was as good as the best of them. When a very bright object (mpon, Rigel) was placed just out of view, there was perhaps a bit more scatter than in much more expensive eyepieces. I noticed the slightest bit of coma for objects at the extreme edge of the field of view that was absent from the other shorter focal length EPs, but this is to be expected. If I focused on an object nearthe edge of the FOV, it appeared sharp and contrasty right across the field of view.Equal to a 31mm Nagler? No. A great value for a "finder" EP? Very definitely.Original post:I used to own Televue and Pentax eyepieces, but the case containing them mysteriously disappeared during a house move. Freed from all that pricey glass, I decided to explore less expensive options to rebuild my collection, hoping that the originals would eventually re-appear. The Baader Hyperion 31mm aspheric replaced a 35mm Panoptic, and honestly, I don't miss it. The Hyperion is lighter, requires no coma correction on scopes f/6 or greater, has a somewhat wider field of view, throws up very bright, very contrasty views even in my somewhat light-polluted back yard, has virtually no internal reflections,and has a very sharp fieldstop. The image quality is notably better than standard Baader Hyperions (which, it should be said, are still an excellent value), more like a Baader Morpheus, IMHO. I experienced a bit of kidney-beaning on first use, but never since, whereas this was a constant challenge with the Panoptic. And it is 1/2 the price! Highly, highly recommended.

I wasn't expecting a tremendous lot from a $200 eyepiece, but this eyepiece is a very pleasant surprise. I got it on the recommendation of an acquaintance who raved about it. He mostly uses TeleVue Ethos eyepieces, and when he told me about this eyepiece, I had to check it out. Once I saw the price, I was ready to be let down, but I ordered it anyway. I have a 9.25" Celestron SCT with a 2" TeleVue diagonal. This eyepiece maintains clarity and chromatic consistency all the way to the edge of the field of view. This size eyepiece is excellent for looking at deep sky objects, and, with a light reduction filter, good for looking at the moon. I have also viewed the sun (through a white light filter) using this eyepiece, but there was very little surface activity, so it was kind of... meh. For me, this is a really good low power eyepiece, and I am very satisfied with it.If you usually go out and spend $$$$ on TeleVue and ExploreScientific super-wide AFOV eyepieces, and you need a good low power eyepiece, I think you might want to check this thing out. It is a lot smaller and lighter than 100- to 120-degree AFOV eyepieces, since there is a lot less glass, but it delivers clear and sharp views.

There was about 1-2 grams of grease towards the bottom of the eyepiece. It was located where the eyepiece narrows from the 2" to the 1.25" profile. The grease had an orange color and was reminiscent of clean motor oil. I wiped this off with a paper towel no problem. Looking at another reviewers comment about oil no damage to the letters and no imperfections to the optics that I can detect.I did look through the eyepiece and felt that the eye relief was not as generous as the rest of the Baader series. Personally like the 10mm and 24mm the best out of the series.Do note that the leather(?) bag is slightly different as are the woven threads. It looks like a nicer material in comparison to the American offerings of the other baader eyepieces. (International product with German manual/info packets).1 star off for the oil/grease. Everything else was as expected.

I decided to switch out a few old plossls and have them replaced with something a bit more quality. After doing some research, I decided to bet on the Baader Hyperion series. The first one I bought was the 5mm Hyperion.With the very first test the difference was obvious. It is like going from 720p to 4k when you want to compare it to something. The lens is so clear and the eye-relieve is fantastic. Adding it to a good Barlow (especially with a magnification cell) makes this amazing.A big plus to me is the opportunity to screw on a T-ring for my EOS for photography when being able to use the eye-piece.

This eyepiece does not really belong to Hyperion family. It is very different than Hyperion. It took my bad memory of Hyperion away the moment I put my eye on it mounted on my f/5 scope. The performance is really good to the edge.

The quality of the lens is noticeable, it is well built, now just start using it

Happy with optical performance, but rubber eye guard keeps coming off the eyepiece. It is fine when rolled down. It is so annoying when observing outside in the dark. I have many Baader eyepieces. I have never had or heard this type of issue with Baader product. Maybe it is only with my particular unit.