Astro-Cows

[Fay]

Yes, I thought that the more stacked subs the better, obviously best to be picky & only use the best one's.

Love the Milky Way, Mark.

[JohnP]

Fay - doesn't make sense stacking frames if they are blurry.....!

That's excellent Mark - Certainly one of the best Jupiter image from an OAS member - Red spot is well defined & you can actually see detail in it also bands, spots & festoon's showing up nicely...

Well done - John

[Tony G]

Mark,

Great images, especially the last Jupiter. I was under the same assumption as Fay, the more frames the better the image, but thinking about what you said John, it seems obvious now that if you keep stacking blurred images on top of each other it would be blurred.
I'm going back to a few of mine, and see what I maybe able to do. (if I get a chance).

Tony G

[Fay]

Of course I would not stack blurry one's!

[JohnP]

Fay as you know when stacking you get images that are very sharp (excellent moments of seeing) through to totally blurry (crap seeing) - obviously it's down to you to decide what % of the images are worth keeping/ stacking. I think Mark was just a bit more critical in which frames he stacked 2nd time around & it really improved the image...

John

[MarkS]

Yes,  John is right, some frames are sharp and others are blurry - you need to decide what % of images to use. 

Now, in theory, Registax should be able to select those best frames using some kind of quality measure but I've never got it to work successfully for planetary images.  So I displayed the frame list and ticked the frames that I myself decided were sharp.  It took 15 minutes to select 80 out of 600 frames but it was well worth it for the final result.

[Fay]

Yes, Mark, as far as I remember, as I don't use Registax that often, I leave up to the program to select the best % that I enter. I have never really looked at 300 frames individually.

[Rick]

Aye. For a relatively bright subject on which you wish to caprure very fine detail you can certainly make a case for taking only the very best few frames. For Jupiter, which rotates relatively quickly, you don't want frames taken over too long an interval either, or the detail will be smeared out.