Trying to figure out what FR to use with the ED80/Moonlite set up. Specifically for the Sun. I need to figure out how to get a full disc as the mosaic thing is killing me. So it's an ED80 f/7 or 560mm. Now I tried a 0.5 and can't quite get there. I need about 5mm-8mm of additional infocus. Problem is perhaps the blocking filter diagonal? Will a 0.8X do the job? If so, it looks like these are not easy to come by. The cheapest I found is from Orion for about 125US but it is a 2" with threads designed to thread into their focuser. Ideally I need one like the 0.5 I already have which is a 1.25" that threads onto the camera. Maybe that doesn't exist?