I purchased the ES92 17 from Eyepiecesetc.com and received it this past Monday. The packaging was excellent, and it was packed well. Thanks Don! I had a chance to look through it immediately on Monday night and Tuesday night, despite cloudy/rainy forecasts. It was clear both nights with nary a cloud in sight. Absolutely beautiful views! The ES92 17 has changed my observing sessions for the better. Now I can take my contacts off when I get home from work, rather than leaving them on until after my observing session which I came to dread.
Love, love, love, love this eyepiece. It is one of those EP’s that has that WOW! factor.
Used it in my f/5.5 10” dob in my backyard. No paracorr.
Mag: 84x | Exit pupil: 3.09mm
First thoughts [eyepiece]
The eyepiece is big and heavy. For my 10” f/5.5, the weight of the EP is of no concern. I had no issues with balance whatsoever with just the ES92 17mm. No counterweights with the eyepiece solo in the Moonlite focuser. My f/5.5 10” is able to handle the ES17 92° + TV PM x2 easily, with a counterweight on the back of the mirror cell via a bolt. No slippage at all.
First thoughts [First light]
This is the first eyepiece I’ve had that allows me to wear eyeglasses. I can see the entire FOV with my eyeglasses on with about 2-3mm between the lens of my glasses and the rubber eyecup of the eyepiece (in the down position).
Very comfortable eyepiece to use. No question about it. The AFOV at 92° does not feel cramped at all. I could not discern much of a difference between the 92° AFOV and the 100° AFOV of the Ethos and ES100 EPs. The difference is much like going from a 6E 100° to a 4.7E with the 110° AFOV. Just not that noticeable. The ES92 17 felt like it had a AFOV of 100°. Very immersive.
The views and the presentation of Saturn, M57, M13, Mars, and Luna were simply amazing. Observing with eyeglasses completely changes the experience for me, and for the better. No more shifting of my contacts. No more of the stars going stig every which way when my contacts shift. I can see the entire FOV with my glasses on with 1-2mm to spare. Just absolutely a tremendous eyepiece. I looked at Saturn, M13, M51, M92, The Double Double, and Mars. I could see the Cassini division on Saturn.
The transmission and edge sharpness in the ES92 17 are top rank.
The ES92 17 has a neutral/warm color overtone on the Moon. The moon doesn’t appear blue/white like it does in my other EPs. Rather it looks more neutral, almost warm. It’s white, but does not tend towards blue. The moon gets very slightly oval towards the very edge of the FOV. It does not impact the views.
Stars were in focus all the way out to the edge. Stars did not lose focus as they got closer to the edge. No astigmatism appeared to be present out on the edge.
I had no trouble holding the view. No blackouts. No kidney beaning. Very easy EP to use.
The EP itself does not have issues catching reflections like with the ES120 9mm. however my eyeglasses does. No fault of the EP.
Contrast seems to be good, even though it was nearly a full moonlit sky. I have a feeling that contrast will end up being a strength of this EP as I’ve looked through other EPs that didn’t have good contrast.
The presentation in the ES92 17 is unbelievable. I know now, that I'm buying the ES92 12 as my next EP. The eye relief on the ES92 17 is tremendous, and the eyepiece is so much easier for my wife and three kids to use (none of whom wear glasses like I do). My son Gustav, (he is 10) commented that everything looked so much clearer in the ES92 17, likely because of the eye relief making it a more comfortable eyepiece to use.
My wife Andrea loved it for the ease of use. She said it's the best eyepiece she’s ever looked through. I have to agree with her. This is the best EP I’ve looked through. I love it. It’s earned a permanent place in my case, soon to be joined by its 12mm sibling.
Edited by tayseidel, 31 August 2018 - 01:14 AM.