View Full Version here: : Saturn 22/08 and 21/08
multiweb
23-08-2021, 01:01 PM
Two shots of saturn in IR with ASI 462MC and Astronomik ProPlanet 742 IR-pass filter. CN-212 at ~8m FL. 10000 best frames out of 3 separate 90s streams joined in Pipp. Bottom one was last night.
h0ughy
23-08-2021, 01:12 PM
Nice grab but does look slightly soft
multiweb
23-08-2021, 01:14 PM
Yep. I'm in a jetstream red zone. :)
Dennis
23-08-2021, 01:26 PM
Very nice Marc, quite astonishing for that focal length.:thumbsup:
Cheers
Dennis
multiweb
23-08-2021, 01:36 PM
Thanks mate. :thumbsup: Condition have been less than ideal but I'm having a ball.
I was surprised too at 8m. The mount is really behaving lately. I could track with only occasional nudging in quite a tightly cropped viewport. It hasn't tracked like that in years. Touch wood.
I also figured Jupiter moons are great to collimate the scope so I did a bit of that Saturday night. It was out a little so very minute adjustments. I also have a slight trefoil shape which I think is the secondary being pinched. Likely but the collimation screws at the back so next clear night I'll release the pressure equally see what happens.
Got a couple of streams on Acrux, Antares and RigelKent when I was tweaking. Will upload them.
Those are great results Marc. I like the way the C-ring is shown which is not easy, especially when dealing with poor seeing conditions. It's all too tempting to just clip any fuziness around the outside, and often that removes a lot of this detail as well. I also think the softness goes away completely when one reduces the image scale, with more space around it, but that's strictly a subjective presentation issue. Nice work!
multiweb
23-08-2021, 02:39 PM
Thanks Mirko. :thumbsup: I'm getting better practice at focusing so just waiting on some decent seeing now. Regarding image scale you reckon I should reduce the final image?
ChrisM
24-08-2021, 10:17 PM
Marc, have you been able to do a comparison between visible and IR bandpass views?
I understand that the IR view should provide a more stable image, but am yet to verify that.....
Cheers, Chris
multiweb
24-08-2021, 10:28 PM
Oh yeah big difference. I don't even bother with color unless the seeing is good. IR is a lot sharper even on the moon. Only problem is less contrast on Jupiter. The bands are subdued and look a lot darker and defined with a straight LUM. IR is also great for collimating I figured recently. My camera is also more sensitive in IR than in visible light which allows a lot of frames to be captured in a short amount of time.
multiweb
25-08-2021, 04:23 PM
Still going through the SER streams. These ones look a little better. Must have been a better slice with the seeing. 21/08 @ 13:11UTC and 13:05UTC
Sunfish
25-08-2021, 05:29 PM
Pretty crisp features in that second shot. Unusual flavour to the IR
multiweb
25-08-2021, 05:33 PM
Thanks Ray. :thumbsup: I seem to have caught a glimpse of that fainter thin outer ring.
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