Search found 138 matches

by mAnKiNd
Sun Sep 16, 2018 1:15 am
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?

Nope, no one has called the cops on me yet...at it again tonight, waiting for clouds to get out of the way and Robin's cloud blasting script to be written.

How's it looking up there?

Cheers
by mAnKiNd
Sat Sep 15, 2018 3:59 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?

Managed to get 6x15m calibrated stacks constructed from 30x30s G230 O100 exposures with the HO filter. I had started at f/4 but didn't like the star shapes, so after about 40 minutes, I stopped the lens down to f/5.17 (with filter rings) and started again. Was much happier with the star shapes, but ...
by mAnKiNd
Sat Sep 15, 2018 2:14 am
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?

Thin clouds here aswell... shooting darks as well...
by mAnKiNd
Fri Sep 14, 2018 4:08 pm
Forum: Tips and Tricks
Topic: New public domain software: astro-dark-frame-library-manager
Replies: 10
Views: 1751

Re: New public domain software: astro-dark-frame-library-manager

Nice work Brian, could be very useful for owners of uncooled cameras.

Cheers
Minos
by mAnKiNd
Fri Sep 14, 2018 11:16 am
Forum: How do I?
Topic: Smart Histogram where to point question
Replies: 4
Views: 606

Re: Smart Histogram where to point question

Ah, well that settles that then lol!

Thank you again for your time Robin

Cheers
Minos
by mAnKiNd
Thu Sep 13, 2018 9:42 pm
Forum: How do I?
Topic: Smart Histogram where to point question
Replies: 4
Views: 606

Re: Smart Histogram where to point question

Thanks Robin, that does make sense (I think!) I understand that if I go with my option 2, then there will be a lot more signal in the fainitest parts of the image (because of the target's presence) and the snr analysis won't be as accurate as option 1 (the normal way of doing it). Hope I'm understan...
by mAnKiNd
Thu Sep 13, 2018 7:15 pm
Forum: How do I?
Topic: Smart Histogram where to point question
Replies: 4
Views: 606

Smart Histogram where to point question

Hi, I raised this question in another topic I started in Deep Sky Imaging, but felt it needed a seperate topic for clarification. In the updated manual, in the Smart Histogram tab, under Measuring Sky Brightness, it states "you should point the telescope at an area of sky without nebulosity or many ...
by mAnKiNd
Thu Sep 13, 2018 6:17 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?

In Photometry there is a quantity called Airmass which is a function of zenith distance. Airmass affects the calculation of photometric magnitude by noting that the atmosphere reddens the color of a star. We can extend this to AP by frequently rerunning The Brain on the same rectangle of dark sky a...