Got my new Lymax Cat Cooler yesterday and tried it out last night. Not that I have any real idea how to use it, I just left the scope out for an hour then bunged the cooler in for 20 min prior to imaging.
Seeing was fairly good, around 7/10 and slowly improving I think, but I had to pack it in around 10pm to get some kip for work next day.
Anyway seeing was good enought to warrant breaking out the 4x powermate. Prob my best avi was the latest of the night (more evidence that the seeing was improving). Here I've shown this image with three levels of processing, ME deconvolution, ME and Unsharp Masking and finally an LR deconvolution with a bit of median filtering to reduce grain.
I'm prestty happy with the result. I also have attached a scaled down version as it sharpens things up and again reduces grain.
Excellent! I don't think they needed scaling down at all! The right hand one in the first attachment is just great, it looks really similar to my one from the 5th May.
Great job!
I was out last night with my fan running, but the seeing was shocking so all avi's have since been deleted.
Glad you got to make the most of it Robert. Lovely shots. I agree with Dennis, very natural looking. Full :thumbusp:
My preference was the full size LR, though I don't know which image shows features more accurately though . If you look at the LF image there is a brown spot to the west (?) of the central meridian on the NEB that appears narrower than in the ME images, even the unsharp mask one. Also a spot on the NTBn (60 deg west (?) looks sharper and clearer as well.
Excellent results Robert, I prefer the full sized images. It's amazing how much the standard of imaging, in the forum, has increased over the past year.
I think you and Dennis are the same people but your logged under 2 different names.....lol
Come on confess...your real name is Dennis Roberts you just threw that (T) in thier to throw us off.....hahaha
Nice work Robert or is it Dennis.
Now Tony... confusing me with Dennis is what I call "High Praise" indeed
Hey Vingo, a cat-cooler is a wierd and somewhat obscene looking device that has a fan one end and a big tube you stick up inside the scope. It pulls cool air from outside inside via an internal filter to trap dust etc. It's meant to help get SCT's cooled down to ambient more fully and more quickly so ther's no tube currents etc.
Glad you got to make the most of it Robert. Lovely shots. I agree with Dennis, very natural looking. Full :thumbusp:
My preference was the full size LR, though I don't know which image shows features more accurately though . If you look at the LF image there is a brown spot to the west (?) of the central meridian on the NEB that appears narrower than in the ME images, even the unsharp mask one. Also a spot on the NTBn (60 deg west (?) looks sharper and clearer as well.
Thanks Paul - yeh, I'm not sure on accuracy either. One thing I noticed was that some of the very fine features look a little extended and I'm wondering if rotational smear might be at play. I've already reduced my usual capture time with Jupiter closer and using this large image scale from 90 to 70 secconds but might need to go to 60 seconds
Robert, I don't think at that image scale you have anything to worry about in terms of rotational blur.
Chris Go uses a C11, larger image scale than you, and he captured for 40 seconds on each channel, plus the time taken to rotate filters, so he captures for 130 seconds all up.
For my last few Jupiters, i've been capturing for 120 seconds.
I think the 90s rule that we all have sprouted over the last years is a "theoretical" limit based on rotational speed of the planet and assuming a very large image scale. At the scale we're using, I think 2 minutes, or even 2.5minutes would be ok.
The easiest way to tell, is to take a 2 minute avi, and "blink" the first and last frames in the avi and see if there's any rotational movement.
Robert, I don't think at that image scale you have anything to worry about in terms of rotational blur.
Chris Go uses a C11, larger image scale than you, and he captured for 40 seconds on each channel, plus the time taken to rotate filters, so he captures for 130 seconds all up.
For my last few Jupiters, i've been capturing for 120 seconds.
I think the 90s rule that we all have sprouted over the last years is a "theoretical" limit based on rotational speed of the planet and assuming a very large image scale. At the scale we're using, I think 2 minutes, or even 2.5minutes would be ok.
The easiest way to tell, is to take a 2 minute avi, and "blink" the first and last frames in the avi and see if there's any rotational movement.
Thanks Mike, that's good news... I could use a few more frames to play with.
cat-cooled JUPITER May 9th
I also have attached a scaled down version as it sharpens things up and again reduces grain.
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