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Custom White balance for modified DLSR?

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#1 bluesilver

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Posted 12 April 2021 - 01:39 AM

Hi,  just a basic question,

I have a fully modified Canon 600D DLSR camera.

I shoot the images in RAW through a telescope.

 

The question is:

Do i need to set up a custom white balance or can i just leave the white balance as standard and take the images?

 

I have read that you should set a custom white balance and also read that it isn't needed.

 

I take the images through Astrophotography tool.

 

I did set up a custom white balance by getting a sheet of A4 printer paper and while the sun was out too a photo of that,  then used that image as my custom white balance.

But thinking now,  I possibly don't even need a custom white balance.

 

Only really asking as i have been thinking when you take flat frames, ( just a white t-shirt over the telescope lens ) the flat color is going to be very different between a custom white balance and a standard white balance with the modified DLSR

 

Sorry if that reads a tad confusing.

But any advice would be appreciated.

Thanks.

 


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#2 bobzeq25

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Posted 12 April 2021 - 02:20 AM

Hi,  just a basic question,

I have a fully modified Canon 600D DLSR camera.

I shoot the images in RAW through a telescope.

 

The question is:

Do i need to set up a custom white balance or can i just leave the white balance as standard and take the images?

 

I have read that you should set a custom white balance and also read that it isn't needed.

 

I take the images through Astrophotography tool.

 

I did set up a custom white balance by getting a sheet of A4 printer paper and while the sun was out too a photo of that,  then used that image as my custom white balance.

But thinking now,  I possibly don't even need a custom white balance.

 

Only really asking as i have been thinking when you take flat frames, ( just a white t-shirt over the telescope lens ) the flat color is going to be very different between a custom white balance and a standard white balance with the modified DLSR

 

Sorry if that reads a tad confusing.

But any advice would be appreciated.

Thanks.

White balance is a terrestrial deal.  It's simply a preprogrammed adjustment of the RGB channels for various terrestrial light sources.  In astro, you do a far more precise adjustment of the RGB channels in processing using other methods.

 

It's useful if you want to take terrestrial photos with a modified camera.

 

Flat color doesn't matter much, you calibrate the lights with the flats before you Debayer them.


Edited by bobzeq25, 12 April 2021 - 02:21 AM.

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#3 asanmax

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Posted 12 April 2021 - 01:01 PM

Yup, pretty much what bobzeq25 already stated.

No custom white balance is needed for astrophotography. You can always balance the colors in postprocessing.


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#4 bluesilver

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Posted 17 April 2021 - 06:25 AM

Thanks for the replies and sorry for the delay in response, been away for a few days.

Some interesting advice there,

I have read in a few different places that say when you have a modified DLSR you must first setup a custom white balance before you start imaging.

But if i am reading correct here,  most are saying that you don't need a custom white balance with a modified DLSR for astrophotography.

Is this correct?

And if so,  do you just leave the white balance set as auto?

 

Sorry for the confusing questions.



#5 michael8554

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Posted 17 April 2021 - 07:56 AM

Is that Correct ? Yes

 

White Balance Auto ? Depends on your processing software.

 

If it applies the white balance setting, then probably a fixed instead of auto white balance, such as Daytime, for consistent results. 

 

But most Raw-loads into the software give you the option to apply or not, most don't bother and colour-correct in the software.



#6 bluesilver

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Posted 17 April 2021 - 05:08 PM

Thanks for the reply,  appreciated.

I am goin g to be using Deep Sky stacker ( DSS ) and either Gimp or StarTools for the processing.

I am thinking StarTools might be the better option of the two.

I was surprised to here that some use a custom white balance,  by taking a photo of a white card and then using this image taken from the white card as their custom white balance.

I would of thought doing this would of taken a lot of the color away from the image,  that was why we modified our DLSR cameras in the first place was to get these extra colors.



#7 bobzeq25

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Posted 17 April 2021 - 05:29 PM

Thanks for the reply,  appreciated.

I am goin g to be using Deep Sky stacker ( DSS ) and either Gimp or StarTools for the processing.

I am thinking StarTools might be the better option of the two.

I was surprised to here that some use a custom white balance,  by taking a photo of a white card and then using this image taken from the white card as their custom white balance.

I would of thought doing this would of taken a lot of the color away from the image,  that was why we modified our DLSR cameras in the first place was to get these extra colors.

A custom white balance is used by a very few imagers.  Most just upload RAW data (which has no white balance applied).  The custom white balance does not take away a lot of color, but not using any white balance generally gives you better control over color.

 

StarTools is a far better choice.  It has an excellent gradient reduction tool (WIPE) for reducing the effects of light pollution, and other advantages.


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#8 F.Meiresonne

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Posted 17 April 2021 - 07:33 PM

+1 for Startools.

 

Worked with GIMP for months , it did  never work out well.

 

Images really got alot better once i got Startools a bit in the fingers.


Edited by F.Meiresonne, 18 April 2021 - 03:23 AM.

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#9 bluesilver

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Posted 18 April 2021 - 12:21 AM

Appreciate the replies.

So basically just set the white balance as auto for the modified DLSR?

Then use DSS for stacking,  then process the image from DSS in StarTools?

Dose that sound about right?

I realize there might be a bit more to it,  but just to get the basics right.

Thanks again,  appreciated.



#10 kevinbreen

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Posted 18 April 2021 - 03:36 AM

Appreciate the replies.
So basically just set the white balance as auto for the modified DLSR?
Then use DSS for stacking, then process the image from DSS in StarTools?
Dose that sound about right?
I realize there might be a bit more to it, but just to get the basics right.
Thanks again, appreciated.


That's right. Save your output from DSS as a FTS file. Open it in StarTools. Then

Autodev
Bin
Crop
Wipe
Autodev
Color
Denoise
Save (if you've bought ST)

That's a very basic outline of ST, granted, but it's a fantastic tool.


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