I had average seeing, but poor transparency with a near full moon. I decided to take out the AT92 again in my backyard red/white zone.
I really wanted to test the ES 17mm 92 deg. Overall it is just an epic eyepiece. I do not use that word often, but it is truly epic in every way.
In my AT92 f5.5 it sings. Perfectly corrected with huge swaths of sky that it swallows up, and it actually is fairly good on the 98.1% full moon.
I had a look at M27, no visible with the light pollution and moon, but with the UHC and OIII filter it was visible. I found M57 as well without the filter but super faint.
I had a look at Vega and star field. I had a look at Altair and surrounding starfields. I swalled up the double cluster, which look muted being so close to the bright moon but still noticeable.
Also Melotte 20, which was perfectly corrected but a bit cut off from being able to view it in its entirety. I had a look at M36, M37, M38....I believe I could only see M36 but I wasnt scrutinizing in this area with how much light was being reflected from the moon.
I had a look at M45, which was super close to the moon but still a nice view.
The moon was actually quite good in the ES 17 as well. Normally wide field eyepieces do not do too well but I was impressed TBH.
Not quite as the clarity of the Brandons, but that could have been an exit pupil thing, as the moon can be fickle that way. You really need to match exit pupils exactly otherwise it is very difficult to discern differences.
Larger exit pupil especially typically pops more, looks better than a smaller exit pupil IME.
Colors seem to pop like nothing else on the moon with those Brandons, especially tonight in average seeing. The full moon was looking stunning with all eyepieces tonight, up until a 32 brandon and 5x powermate which the seeing started getting a tiny bit wavy. The 15 and 11 delites were performing very well. I alternated between the lumicon 25% neutral density filter, the lumicon light yellow, and lumicon orange filter while viewing the moon, each with their roles to play on viewing luna.
Another awesome part of the night was the clouds that transited the disk. I took off all filters when this did that and the light, thin cloud did little to hamper the view, actually made it a bit contrasty.
I spent most of my time on the terminator, if you can call it that with such a bright illumination phase. Key aspects were observing Pentavius, including its central peaks and Rimae Petavius visible inside it. Also
There was a mare on the edge of visibility, Vendelinus which looked great. Mare Crisium also dominated the view, with its smooth flooded lava plane. Small craters were visible on the surface at the edge of visibility on Mare Crisium's floor, and the geological folds were also noted in the large mare.
Other medium sized craters like Wrottesley, Pentavius B, Lohse, and a trio of small craters around Langrenus, which that in itself was the next most attractive large crater with its central peaks, rivalling Pentavius with its grandeur.
I was worried a fast scope might not ever give me jaw dropping views of the moon, nothing like longer focal length scopes can deliver but tonight just proved otherwise, that fast quality scopes can rise to the occasion. Finding focus is a tad harder than it would be on a f7.5+ refractor, but the fine focuser on the AT92 is very easy to dial in smoothly. It is also comes to a sharp focus, where you know you are in hard focus.
This fact is especially true with viewing double stars. I tested it out on Almach tonight. Brilliant orange/yellow and blue secondary always deserves a look. I checked it out with the 24 brandon and 5 x powermate, and got the air disk of the main component of Almach.
The night wasn't conducive to viewing much other than the moon, but it was a fun night out nonetheless.
Thanks for reading and clear skies!
Edited by Tyson M, 14 November 2019 - 12:07 AM.