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Using my Astronomik CLS light pollution filter, I found that my astrophotos were awash with blue. I could not process them correctly and especially with galaxies, I ended up discarding hours of work. After some helpful advice, I tried a 'custom white balance' on my Canon 30D by shooting a white card in full sunlight with the filter attached. I set that photo as the one to use as custom white balance, and Voila! Balanced photos.

The filter always did a great job removing light pollution, but now it's a snap to process the images.

You can see that the WB that I was using, daylight, is the absolute worst setting I could have chosen.

All photos in this folder are with the Astronomik CLS filter installed.

White Balance Calibration Photo

White Balance Calibration Photo

New, Non-Overexposed Calibration Photo

New, Non-Overexposed Calibration Photo

Auto WB

Auto WB

Daylight WB

Daylight WB

Custom WB

Custom WB

Auto WB

Auto WB

Daylight WB

Daylight WB

Custom WB - Yes, Thats a Red Leafed Maple - Not Green

Custom WB - Yes, Thats a Red Leafed Maple - Not Green

Auto WB

Auto WB

Daylight WB

Daylight WB

Custom WB

Custom WB