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tony, couldn't you have taken a practice shot and rotated said cooled camera diagonally to take in said monstrous galaxy? Having said that, what great detail and wow factor again!
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Very true Houghy...it would have been easy for me to rotate the camera so it was framed better...my fault...no excuse Tony....wont happen again.
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I see what you mean about the donut Tony.
Curious to see what's causing it.
Has it occurred before in other images?
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It sure has...all my images with the focal reducer does but it wasn't on my first images using the FR...?????....cant see the donut without the FR imaging at F10.
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Very nice Tony, what FL is that at?
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Approx 2000mm focal length
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Are you finding that having a cooled camera is making a big difference?
Have you tested both cooled and uncooled?
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Geoff there is definitely a small increase in performance with less noise but is less noticeable doing 3-5 minute exposures, where I think it will improve results is in summer time when it's hot up here and also doing extremely long exposures at a dark site...something like 20+min exposure's.
Basically anytime when heat noise becomes a problem there will be a beneficial increase to signal noise ratio.
Thanks guys and I am sorry I did not frame the image properly...somehow my mind was more on this stupid donut and how to fix it.
Also it can not be dust on the reducer because I just got it replaced this week with brand spanking new one...same results.