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Old 17-04-2021, 10:28 AM

JA is offline
Join Date: Oct 2016
Location: Melbourne, Australia
Posts: 2,259
Originally Posted by bluesilver View Post
Hi, just a quick basic question in regards to creating a custom white balance for a DLSR.

I have a fully modified Canon EOS 600D
This is how i set up my custom white balance
and was just looking for a bit of advise if i have done it correctly.
I went outside on a sunny day with a sheet of A4 printer paper,
I take a photo of this piece of paper with the camera in automatic basic setting.
I then save this pinkish color image and use this image as my custom white balance.

To take the flat whites, I just place a white t-shirt over the telescope lens and point the telescope to a clear part of the sky on a sunny day and take 60 second exposures.

Dose all this sound correct, or am i doing it all wrong?
Any information or advise would be appreciated.
Hello Peter,

You have a Fully Modified DSLR, i.e: the Canon internal UV/IR filter has been removed and not replaced. If that's the case, and you shoot in RAW, there is nothing to concern yourself with. You've modified the camera to increase the Ha sensitivity so you will get more red channel signal - as it should be. In the Case of Canon you will likely have 3 to 4 times more Ha signal than before. If you do a white balance using a white card you will simply be turning down the signal you have fought/paid to achieve. Any corrections to colour can be be made in post processing as one wants the highest possible signal into camera's systems, short of clipping maximum ...,for potentially the lowest possible noise.

If on the other hand your desire to white balance is for daytime use, then that's another story and on a fully modified camera best achieved with an external UV/IR cut filter (similar to the one you removed internally).

On cameras that are not fully modified (UV/IR filter replaced with a broader alternative like Baader) there is more scope to white balance for daytime use and get a colour correct (natural) result.


Last edited by JA; 17-04-2021 at 10:39 AM.
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