So I'm gearing up for my yearly trip to Utah and Bortle 1 skies! I've been thinking about purchasing a TV 11mm Plossl for the faintest of the fuzzys. I use 100 degree eyepieces and a Coma Corrector, and Ive only used cheap plossls.
Do you think a premium Plossl without a Coma Corrector would noticablely improve light transmission over my current setup?
No. You might go from 94% to 98%, about a 0.03 magnitude improvement.
That is likely less than the difference in the sky from moment to moment.
My last time out I was looking at a galaxy somewhere in the middle 15th magnitude range with an Ethos eyepiece
and I popped in a Delite (which has really insanely good contrast) to see if I could see it better.
Nope. And the extra need for constant nudging drove me nuts, so I went back to the Ethos.
And your scope has an even longer focal length than mine.
The gain in light grasp with a simpler eyepiece, which is what is needed, isn't sufficient enough to help at all.
A sky with high transparency is what matters. A large aperture scope is what matters. Eyes very sensitive to light are what matter.
Concentrate on maintaining the best night vision you can to see deeper.
--don't use any lighting of any kind. Cover all red led lights with tape.
--don't look at the night sky with your observing eye.
--block all peripheral light at the eyepiece, with hands, hood, lightshield, whatever. Since you own the 9mm 120°, you're already used to doing this.
--look at a black cloth on the ground until you can see wrinkles in it, then move to the eyepiece immediately
--be at least 15 minutes after looking at the sky or using a light of any kind.
--if you use DSCs, turn off the screen
--use the eyepiece with the rubber flipped up
By doing all that, you can gain a half magnitude. That's like having an eyepiece with only a 63% transmission versus a 100% transmission, a situation that doesn't exist.
Edited by Starman1, 25 January 2020 - 02:07 PM.