Search found 138 matches

by mAnKiNd
Wed Sep 12, 2018 9:53 pm
Forum: Deep Sky Imaging
Topic: sticky exposure length or sticky gain/offset for sky-limited exposures?
Replies: 41
Views: 4539

Re: sticky exposure length or sticky gain/offset for sky-limited exposures?

I've read about people keeping gain and offset the same. Some people opt for keeping the stack size the same and adjusting exposure, and others who keep the exposure the same and adjust the stack size. They are equivalent but keeping the exposure the same allows you to use the same darks. Brian Ind...
by mAnKiNd
Wed Sep 12, 2018 9:48 pm
Forum: Deep Sky Imaging
Topic: sticky exposure length or sticky gain/offset for sky-limited exposures?
Replies: 41
Views: 4539

Re: sticky exposure length or sticky gain/offset for sky-limited exposures?

Having said, it is often recommended to vary gain/offset and is often done in imaging techniques, for example, Mr. Rista and others wrote many times on the CN forums about using the following gains for the ASI1600: L: G50 O50 RGB: G75 O50 NARROWBAND: G200 O50 ...all of them sharing the same offset s...
by mAnKiNd
Wed Sep 12, 2018 9:44 pm
Forum: Deep Sky Imaging
Topic: sticky exposure length or sticky gain/offset for sky-limited exposures?
Replies: 41
Views: 4539

Re: sticky exposure length or sticky gain/offset for sky-limited exposures?

oopfan wrote:
Wed Sep 12, 2018 9:41 pm
Yes, I wouldn't mess with changing gain since it affects the full well depth.
Thanks, that is a very good point and could cause inconsistencies within the different filter datasets/livestacks.
by mAnKiNd
Wed Sep 12, 2018 9:39 pm
Forum: Deep Sky Imaging
Topic: sticky exposure length or sticky gain/offset for sky-limited exposures?
Replies: 41
Views: 4539

Re: sticky exposure length or sticky gain/offset for sky-limited exposures?

Hi Brian, thanks, that is correct indeed! I shortly considered that option, but since I'm going to rely on the auto-save feature (for ensuring consistency between stacks), it can only do x minutes so far, not auto-save every x amount of frames. Perhaps Robin can squeeze this one in when he gets a ch...
by mAnKiNd
Wed Sep 12, 2018 9:24 pm
Forum: Deep Sky Imaging
Topic: sticky exposure length or sticky gain/offset for sky-limited exposures?
Replies: 41
Views: 4539

Re: sticky exposure length or sticky gain/offset for sky-limited exposures?

Here's a working example of what I'm talking about but with imaginary figures as I've yet to determine actual values: 1hr Livestack comprised of sticky exposure lenghts: L: 120x30s G50 O10 R: 120x30s G75 O30 G: 120x30s G70 O30 B: 120x30s G75 O30 1hr Livestack comprised of sticky (i.e. unity) gain/of...
by mAnKiNd
Wed Sep 12, 2018 9:08 pm
Forum: Deep Sky Imaging
Topic: sticky exposure length or sticky gain/offset for sky-limited exposures?
Replies: 41
Views: 4539

sticky exposure length or sticky gain/offset for sky-limited exposures?

Some advice would be greatly appreciated. I'm about to start a new project and I'm contemplating which would be the best approach. I'll be shooting the Heart Nebula and wanted to see how long I could collect data for it. Each night, I'll go out and capture my respective mono channels (as 60 minute a...
by mAnKiNd
Wed Sep 12, 2018 8:31 pm
Forum: Gallery
Topic: IC 5070 Pelican Nebula
Replies: 6
Views: 1044

Re: IC 5070 Pelican Nebula

Very nice work Dave! Loving those textbook histograms :) All Star Polar Align (Celestron mount) Just curious, do you carry out ASPS in conjunction with SC plate-solving for each alignment point? I tried that once and it builds up the model quite efficiently. However, I then started selecting Quick A...
by mAnKiNd
Wed Sep 12, 2018 8:18 pm
Forum: Deep Sky Imaging
Topic: To Gain or not to overGain
Replies: 37
Views: 4661

Re: To Gain or not to overGain

Very useful points! I'd also like to add that with high-gain, short exposures apart from the aforementioned, you also increase the probability of tighter stars in your final stack.That and also less trails and other anomalies as they will most probably affect only one out of your many short exposure...
by mAnKiNd
Sun Sep 09, 2018 1:37 am
Forum: Gallery
Topic: NGC 896, The Fish Head Nebula
Replies: 6
Views: 894

Re: NGC 896, The Fish Head Nebula

Textbook histogram!
by mAnKiNd
Sun Sep 09, 2018 1:23 am
Forum: Gallery
Topic: M52+NGC7635
Replies: 12
Views: 1426

Re: M52+NGC7635

Super!"