Re: Processing Darks Using Maxim V5


Sep 6, 2008

 


----------------------------

#33745 Sep 6, 2008

I am working with a Canon 400D DSLR and would like to establish a

library of dark frames taken at different exposures and temperatures.



Is there a way to add the temperature field to the FITs header for

each file so that Maxim can select classify the files as if they were

recorded using an temperature controlled camera? I will collect these

darks in groups (at a given time, temperature and ISO) so that I have

a library of darks.



Do any of you guys do this sort of thing - or do you simply take a set

of suitable darks at the end of each session?



Peter



----------------------------

#33746 Sep 6, 2008

Peter,



As far as I know (and Im a beginner), with a DSLR, you can only take

darks at the end of each session.



Paul



peter2a6 wrote: >

> I am working with a Canon 400D DSLR and would like to establish a

> library of dark frames taken at different exposures and temperatures.

>

> Is there a way to add the temperature field to the FITs header for

> each file so that Maxim can select classify the files as if they were

> recorded using an temperature controlled camera? I will collect these

> darks in groups (at a given time, temperature and ISO) so that I have

> a library of darks.

>

> Do any of you guys do this sort of thing - or do you simply take a set

> of suitable darks at the end of each session?

>

> Peter

>

>



----------------------------

#33747 Sep 6, 2008

Hello Peter,



I'm no expert. But it would seem to me you could go to

View, Fite Header Widow, Edit Tab,

Type the appropriate FITS Header keyword for temperature, CCD-TEMP, in the

Keyword drop down.

It will find it if it exists, you can add it if it doesn't.

Enter the temperature in the Value field.

Click "Set"



Here are some temperature related FITS header keywords:



CCD-TEMP = -10.203084036736080 /CCD temperature at start of exposure in C





Best,

Michael



_____



From: MaxImDL@yahoogroups.com [mailto:MaxImDL@yahoogroups.com] On Behalf Of

peter2a6

Sent: Saturday, September 06, 2008 12:04 PM

To: MaxImDL@yahoogroups.com

Subject: [MaxImDL] Processing Darks Using Maxim V5







I am working with a Canon 400D DSLR and would like to establish a

library of dark frames taken at different exposures and temperatures.



Is there a way to add the temperature field to the FITs header for

each file so that Maxim can select classify the files as if they were

recorded using an temperature controlled camera? I will collect these

darks in groups (at a given time, temperature and ISO) so that I have

a library of darks.



Do any of you guys do this sort of thing - or do you simply take a set

of suitable darks at the end of each session?



Peter













[Non-text portions of this message have been removed]



----------------------------

#33751 Sep 6, 2008

Thank you all for your comments! For future releases of Maxim, it

would be nice to have a dialogue box within the sequence window that

would allow DSLR users to specify the ambient temperature. This value

would then be written into the FITs header of each dark file to assist

the the calibration process within Maxim. Maybe Doug can weigh in on

this? On the other hand, there may already be a way to do this without

doing what I suggested.



PP



--- In MaxImDL@yahoogroups.com, "Woody Schlom" woody@...> wrote:

>

> Well at least with MaxDSLR 4.6, you can take darks before, during,

and/or

> after your main LIGHT imaging.

>

> Using SEQUENCE I used to program in my darks during the imaging session.

> You tell the program how many LIGHT images you want and how many

DARKS you

> want and the program divides them up evenly and prompts you when to

cover

> the scope for the next dark.

>

> HOWEVER, constantly covering and uncovering the scope during an imaging

> session gets old real fast -- and it wastes a LOT of valuable imaging

> time -- and if you accidentally bump the scope you can lose your guiding

> star too!

>

> Then a DSLR "expert" in our club said that just like with real CCD astro

> cameras, he creates libraries of DSLR darks while he's at home and not

> imaging -- and then recalls these libraries later when he does his image

> processing.

>

> I understand that the key to creating and using libraries of DSLR

darks is

> matching ISO, exposure time and ambient temperature. You must use

darks of

> the exact same ISO, exposure time and ambient temperature as your LIGHT

> exposures.

>

> You need to create many different series of darks at different ambient

> temperatures and exposures. And then when you do your imaging, you

need to

> note the ambient temperature so you later use the corresponding set of

> darks.

>

> Hope this helps.

>

> Woody

>

>

> > Peter,

> >

> > As far as I know (and Im a beginner), with a DSLR, you can only take

> > darks at the end of each session.

> >

> > Paul

> >

> > peter2a6 wrote:

> > >

> > > I am working with a Canon 400D DSLR and would like to establish a

> > > library of dark frames taken at different exposures and

temperatures.

> > >

> > > Is there a way to add the temperature field to the FITs header for

> > > each file so that Maxim can select classify the files as if they

were

> > > recorded using an temperature controlled camera? I will collect

these

> > > darks in groups (at a given time, temperature and ISO) so that I

have

> > > a library of darks.

> > >

> > > Do any of you guys do this sort of thing - or do you simply take

a set

> > > of suitable darks at the end of each session?

> > >

> > > Peter

>







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