After spending a couple of hours with a spreadsheet to work out the spacings, I realized a couple of things:
- If I put the helical focuser on the guide camera port, there is no way to get the 85mm back focus I would need to use the
- If I put the helical focuser on the imaging camera side, I can not only get the 85mm back focus, but I can do it with spacers I already have.
So I tried it out today. I set up my C-8 with the
I know that conventional wisdom says to put the focuser on the guide camera. But as far as I can tell, what matters is just that the two paths are equal. I just have to remember to focus the guide camera first, with the scope's focuser, and then adjust the imaging camera to match.
Am I missing anything by doing it this way?