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Model: sw_aero_eyepiece-2Part Number: 20178
>Available in focal lengths of 30mm, 35mm & 40mm, with eye relief of 16.7mm, 17.5mm & 20mm respectively.
This is my one and only 2-inch eyepiece. It came very fast to Greece from FLO and shopping was a pleasant experience.It was well packed in its well-made cardboard box and a bubble envelope. The quality of the eyepiece itself felt very good.It felt large and well made in my hands and I could see the various colours reflected by the coatings of the 6 lens elements.However, is light and my Dobson can easily handle it without losing its balance.My only wide-angle eyepiece up to now was a budget 1.25-inch 40mm Plossl with AFOV around 40 degrees.With this Plossl stars had noticeable aberrations, but I didn't mind because I used it as a finder.I have a DIY f/5, 203mm Dobson telescope which is supposed to be demanding in every aspect, so I didn't complain.Then I put the AERO 35mm in my focuser and I had a field of view considerably larger than the 40mm Plossl!The Pleiades cluster that tightly fit in the 40mm Plossl field was now framed by a comfortable margin of starry space!The same happened with the double cluster and the owl nebula.The AERO eyepiece resolution was at least as good as the Plossl's and stars were clearly defined across most of the field.This AERO gave me the same experience as my excellent Russian TENTO 20x60 only there were more stars, everything was larger (28x), brighter and rock stable.Finding targets in the sky is now as easy as it can be. I just put the altazimuth coordinations from my smartphone to my telescope graded circles and the target is instantly in the frame!I am used to watching through various wide-angle binoculars and the AERO's aberrations at the margin of the field were much less noticeable than in my binoculars.In my light-polluted area, the background was not greyer in the eyepiece than what it was with the naked eye.Unfortunately, I didn't have the opportunity to test this eyepiece in a really dark sky. I can't wait to use it during my summer holidays under the pitch-black sky of an island.During the daytime, I noticed some spherical aberration, but the centre of the field is so large and in focus that I didn't mind much.All in all, I really liked this eyepiece but I don't have anything similar to compare it with. As I can't compare it to other similar eyepieces my 5-star rating could be somewhat subjective, but I was very satisfied with this wide-angle eyepiece.It was a new experience for me so I haven't got any negative aspects to comment on.In conclusion, this eyepiece offered me a field of view similar to my binoculars, but with the power of an 8-inch telescope!
Nice and Clear no distortions like pincushion or barrel in my SCT..PERFECT EP for viewing and finding..near as good as my former Pan 27mm..Quite remarkable value at f10 not tried yet at f5 but heard exc from other owners...recommended with NO reservations.
The rule of thumb goes that you shouldn't use eyepieces that exceed a 7mm exit pupil, especially in telescopes with central obstructions. But rules are there to be broken, and being a young, rebellious chap (with quite large pupils), I decided to try out the 40mm in my f/5 and f/4.5 reflectors, giving 8-9mm exit pupils. I did not notice any central darkening and in fact got very pleasant views. I have to say it is one of the sharpest widefield 2" eyepieces I have tried, and performs very well even at these focal ratios. Eye relief is pretty generous, but not too long as to cause kidney beaning - it is very comfortable to view through. Build quality is not up to the high-end standard, but is perfectly adequate. I very much appreciate the tapering barrel as it provides security without the likelihood of getting caught on compression rings. It is also small and light for a 2" eyepiece.One curiosity I noted about the 40mm is the inability to fully accept 2" filters. They screw in about half a turn before jamming.In summary, a fantastic sharp eyepiece with a very reasonable price tag.
First Light Optics LtdUnit 7 Budlake UnitsBudlake RoadMarsh Barton Trading EstateExeter, DevonEX2 8PY
Company No. 5892293VAT No. 907 2895 01
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