First Tests of our new

Hutech Modified Canon XTi

Uploaded 12/31/06

 Here is some of our initial testing of one of the very first Hutech modified 10.1 Mpixel Rebel XTi cameras. The modifications we had done was to remove the IR blocking filter, and replace with the Type 1a filter, allowing full Hydrogen alpha response. When exposed for daylight, the images have a strong red tint, however applying a custom white balance profile while in the RAW format before conversion using a white solar calibration eliminates the cast and produces accurate colors. For the lunar image below, the lunar highlands are pure white from being pulverized by cratering, and provided essentially a grey card in sunlight for the nights shooting. Shooting deep sky on such a bright moonlit night was asking for trouble because the sky is a bright blue color at night. But getting familiar with this high resolution and very low noise camera in the not so dark was a very enjoyable experience!

Lets start with some lunar image with the 12.5" f/5 Newtonian at prime focus, and the camera set for ISO400. Here we compare the before and after on the custom white balance. Seeing was poor.

This is the raw image out of the camera with the overall reddish cast.
Larger Size Clicking the white balance eyedropper on the lunar highlands near the top gave a very neutral color correct view

Next we applied this white balance "recipe" to all of the images to yield balanced images. Here is a shot with the 12.5" and Televue 2x barlow of the Sea of Tranquility.

Click here for larger size
With the nearly full moon only 30 degrees away, the sky was a bright blue color. Five one minute frames of Orions Sword were averaged for this moon fogged image with the Stellarvue SV80s at f/4.8
Larger Image here The same image after some processing shows plenty of reds, a FAR cry from my un modified 10D, which shows the nebula as greens and blues only.

The crab nebula was nearby and just as badly sky fogged. But this three minute exposure with the Stellarvue shows the nebula clearly.

Larger Image here
Instrument: 12.5" f/5 Home made Newtonian or Stellarvue SV80s Platform: Astrophysics 1200 QMD Camera: Hutech Modified Canon XTi @ ISO400 Exposure: 1m subframes Filters: None Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing 8/10, Transparency 2/10 Outside Temperature: 35F Processing Tools: Photoshop CS2, Maxim DL, Canon RAW HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS FastCounter by bCentral