[bojan]

By accident, I discovered one more thing that may improve the camera handling when used with telescopes ...
When trying to use LP filter in adapter I made (3D print) with my (un-modded) 60D, I "managed" to lose the focus screen.
I noticed since than that I can see much fainter objects in the view finder, but I became really aware of the cause for this when trying to take terrestrial images in Snake Valley - first, it became immediately obvious that the screen is missing, view was limited to centre of the frame only (I was using 18mm lens).
And of course, all pics were over-exposed.
I removed the screen from my moded 450D but it did not fit into 60D of course, so I ordered the replacement on ebay (not original - it is $45 + post!).
Now I started thinking of 60D full modification - without screen the camera is useless for terrestrial photography, but on telescope or longer it is easier to use viewfinder as it is now.
And I have un-modded 450 for everyday use.