hi,

I'm wondering if it's possible and how best to drop the focal ratio of my C80-ED from f/7.5 to f/5'ish. All my equipment is packed away at the moment (hence the endless clear nights) for moving house, so I have to think about using it instead! .

Attached is a diagram of the adapters I use to attach the 300d to the C80. I realised there are limitations due to the 1.25" drawtube adapter restricting the tube diameter. I have a 0.5x 1.25" focal reducer which can fit into this adapter, but of course this creates an even smaller inner diameter and is quite far from the camera sensor.

It's probably a long shot, but I was wondering if there are any 0.6'ish x focal reducers that are either EOS clip (will attach directly to the 300d) or T-thread (will attach to either end of the extender tube or allow it to be ommited and attach to the drawtube T-thread adatper)?

Thanks