Re: [MaxImDL] Question on bias calibration


Aug 7, 2011

 


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#46330 Aug 7, 2011

Hi Guys,

.

I have a stupid newbie question. I need to calibrate my Lights from a SXVF-M25C with Flat frames.

To do that I have to calibrate Light and Flat frames with Bias frames. If Light and Flat frames were shot

at different temperatures and therefore I have two different.set of Bias, how should I set the calibration

groups in Maxim V 5? How does Maxim know which Bias group apply to the Lights and which to the

Flats? I understand that under Advanced in the Set Calibration window I have to mark

Calibrate Bias, Calibrate Flat and Bias Subtract Flats, right?

.

Thanks for any help.

.

Admilson

www.adm-astronomy.com



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



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#46409 Aug 12, 2011

Bias frames are generally assumed to be temperature independent, since they

are zero duration and therefor have little change to accumulate thermal

noise.



Are you instead referring to darks?



John



On 7 August 2011 07:00, Admilson admilson_p@...> wrote:



> **

>

>

> Hi Guys,

>

> I have a stupid newbie question. I need to calibrate my Lights from a

> SXVF-M25C with Flat frames.

> To do that I have to calibrate Light and Flat frames with Bias frames. If

> Light and Flat frames were shot

> at different temperatures and therefore I have two different set of Bias,

> how should I set the calibration

> groups in Maxim V 5? How does Maxim know which Bias group apply to the

> Lights and which to the

> Flats? I understand that under Advanced in the Set Calibration window I

> have to mark

> Calibrate Bias, Calibrate Flat and Bias Subtract Flats, right?

>

> Thanks for any help.

>

> Admilson

> www.adm-astronomy.com

>

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

>

>

>





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



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

#46435 Aug 15, 2011

Hi John,

.

thanks for the clarification. In fact the guys from the SXV forum suggested me

to create a single masterbias to be used to calibrate lights and flats, independent

of outside temperature. This seems to work perfectly so far.

.

All the Best

Admilson



From: John Winfield winfij@...>

To: MaxImDL@yahoogroups.com

Sent: Friday, August 12, 2011 7:25 PM

Subject: Re: [MaxImDL] Question on bias calibration



Bias frames are generally assumed to be temperature independent, since they

are zero duration and therefor have little change to accumulate thermal

noise.



Are you instead referring to darks?



John



On 7 August 2011 07:00, Admilson admilson_p@...> wrote:



> **

>

>

> Hi Guys,

>

> I have a stupid newbie question. I need to calibrate my Lights from a

> SXVF-M25C with Flat frames.

> To do that I have to calibrate Light and Flat frames with Bias frames. If

> Light and Flat frames were shot

> at different temperatures and therefore I have two different set of Bias,

> how should I set the calibration

> groups in Maxim V 5? How does Maxim know which Bias group apply to the

> Lights and which to the

> Flats? I understand that under Advanced in the Set Calibration window I

> have to mark

> Calibrate Bias, Calibrate Flat and Bias Subtract Flats, right?

>

> Thanks for any help.

>

> Admilson

> www.adm-astronomy.com

>

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

>

>.

>





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







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



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