Modifying a DSLR to Full-Spectrum for Astro-Photography

We decided to take one more step further in our favorite hobby, and sent our Canon 100D DSLR camera for removal of the pre-installed “Red Filter.”

We used Kolari Vision ( for the process, which is simple; pay the fee, send the camera, let them do their job, get the camera back. The service charge was $275, priority shipping with USPS was $23 (with signature confirmation & $500 insurance). Sent the camera on Friday and it was shipped back on Wednesday and I received it on Saturday.

You have to use a custom white balance to override camera’s red filter settings. The easiest way to do it is taking a picture of a white or gray surface under good light. After that you can choose that image under “Custom White Balance” menu and the camera will adjust itself.

Clouds weren’t helpful almost for a week. Finally, I had a chance to take a picture of Orion Nebula (M42) for comparison. Here is the result:

The left one is the same camera a month ago, and the right one is the same camera tonight. So all the blue clouds we saw was actually purple.

Also the histogram of another target (Horse-head Nebula) shows the difference clearly:
I will post more about this once I have more.