Re: [MaxImDL] Re: Refreshing my Calibration Frames


Jul 30, 2013

 


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#54069 Jul 30, 2013

It's been almost a year since I ran dark and bias frames and I want to update them before I go off to Oregon Star Party next week. last time I did 25 darks at 10 minutes and scaled them during processing. Now that I have a camera with Narrowband filters and may be taking up to 20 minute subs, I am assuming I can go with 20 minute darks and scale them to any exposure less than 20 minutes?



Thanks!



Wayne



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#54070 Jul 30, 2013

You can, but you will definitely get better results using darks

collected at the same exposure time as your lights, and not using

scaling. It takes more time to build up a library this way, but IMO is

worth the effort.



Chris



*******************************

Chris L Peterson

Cloudbait Observatory

www.cloudbait.com

On 7/30/2013 3:29 PM, Wayne wrote:

> It's been almost a year since I ran dark and bias frames and I want to update them before I go off to Oregon Star Party next week. last time I did 25 darks at 10 minutes and scaled them during processing. Now that I have a camera with Narrowband filters and may be taking up to 20 minute subs, I am assuming I can go with 20 minute darks and scale them to any exposure less than 20 minutes?

>

> Thanks!

>

> Wayne

>



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#54071 Jul 30, 2013

Thanks Chris, I suspected that. An alternative I guess is something like sets of 1, 2, 3, 5, 10 and 20 minute flats and sticking to those for exposures

--- In MaxImDL@yahoogroups.com, Chris Peterson cpeterson@...> wrote:

>

> You can, but you will definitely get better results using darks

> collected at the same exposure time as your lights, and not using

> scaling. It takes more time to build up a library this way, but IMO is

> worth the effort.

>

> Chris

>

> *******************************

> Chris L Peterson

> Cloudbait Observatory

> www.cloudbait.com

>

> On 7/30/2013 3:29 PM, Wayne wrote:

> > It's been almost a year since I ran dark and bias frames and I want to update them before I go off to Oregon Star Party next week. last time I did 25 darks at 10 minutes and scaled them during processing. Now that I have a camera with Narrowband filters and may be taking up to 20 minute subs, I am assuming I can go with 20 minute darks and scale them to any exposure less than 20 minutes?

> >

> > Thanks!

> >

> > Wayne

> >

>



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#54072 Jul 30, 2013

That's what I do. 30s, 60s, 120s, 180s, 300s, 600s, and 1200s masters at

-10C, -15C, and -20C, 1x1 and 2x2 binning. Lots of frames, but collected

easily and nearly automatically on nights I'm not imaging, and updated

about every year.



I don't use any of Maxim's tools for automatically rounding up images

and including them in calibration sets, but if you do, I'd suggest

making saved master frames from your existing data and saving them with

your previous imaging projects. Otherwise, you may lose the ability to

go back and reprocess them in the future once you've got a new library

in place.



Chris



*******************************

Chris L Peterson

Cloudbait Observatory

www.cloudbait.com

On 7/30/2013 3:42 PM, Wayne wrote:

> Thanks Chris, I suspected that. An alternative I guess is something like sets of 1, 2, 3, 5, 10 and 20 minute flats and sticking to those for exposures

>



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#54073 Jul 30, 2013

On 7/30/2013 3:42 PM, Wayne wrote: > Thanks Chris, I suspected that. An alternative I guess is something like sets of 1, 2, 3, 5, 10 and 20 minute flats and sticking to those for exposures

>

> --- In MaxImDL@yahoogroups.com, Chris Peterson cpeterson@...> wrote:

>>

>> You can, but you will definitely get better results using darks

>> collected at the same exposure time as your lights, and not using

>> scaling. It takes more time to build up a library this way, but IMO is

>> worth the effort.



It may take more computer and camera time, but it doesn't take much of

your time... Just set up a sequence for your darks, and walk away. My

last dark sequence run took about 8 hours to complete, but I was sleeping.



Rick



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