Test in french

These tests are complementary of the excellent work made by Christian Buil which can be seen here :

As my theoretical knowledge is not so strong as Christian's one ;-))) I wanted these tests being very practical : the aim of these tests is to understand how an astronomy-for modified EOS 350d works in every day photography, the original Canon anti-IR filter being replaced by Baader's one.

The DSLR has been modified by my friend Richard Galli feel free to contact him in French or English if you want him to modify your camera body. These tests have been made with :

- 2 totally unfiltered cameras
- 1 straight out of the box with Canon original filter inside
- 1 Baader filter inside modified camera
- 1 17-40mm L - f/4 lens
- 1 macro lens 100mm - f/2,8
- 1 70-200mm L - f/4 lens
- 1 300mm L - f/4 lens
and last but not least !!
- 1 100-400mm L lens Here is a picture of the little zoo ;-)))) :

I made these tests with 2 mains goals in mind: First what about white balance (WB) after modification and how to correct it, and second, how is Autofocus working, which can be interesting for most daylight photographers ;-)))

White Balance :

All pictures are RAW files. Of course, no colour adjustment or sharpening has occured.

In a first experience, all cameras are shooting with automatic white balance (AWB setting on the EOS)for comparison purpose. If you wish to learn more about WB please refer to your instruction manual.

totally unfiltered camera :

focus is not perfect but it was not the aim for this picture

Baader filter inside modified camera :

"normal" camera :

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All images copyright © Thierry Demange