Min exposure time to see *something* of M101/other galaxies?

[coxy322]

How does a filter fit between the T-Ring and the Focuser when using Prime Focus?

Do you have any links to the required equipment to use filters with Canon 1100D and the scope?

LP is not necessarily a huge problem where I live but it is here (edge of 80k pop town) - is it worth getting into LP filters or do you get better results just processing the LP out?

[RikM]

the Astronomic EOS clip filters fit up inside the body of the camera. You can also use these with EF series lenses though not with EF-S unless you make some modifications.

I use a 2" filter which screws onto the focuser end of my coma corrector, the t-ring and camera fit onto the other end of the coma corrector. filters should screw onto the front of normal t-adaptors in the same way though.