ryanh

So i got a new telephone a couple months ago, i got a Explore Scientific Ed80 (480mm, f/6) to pair up with my Canon T4i, and with this i got a Orion Field Flattener. I saw that i needed to have 55mm of backfocus, but when i had around 55 of backfocus, i couldn’t even focus on the subject. I had to use extenders to even get my camera to focus. So from the edge of the field flattener to my camera sensor was around 93.5mm. Am i doing something wrong? I feel like the edges look horrible compared to other peoples images with the same ff. Does this ff just not work with my scope? if so would greatly appreciate it if someone told me what ff would work for it. I just want to get back out imaging again. Image i got with the ff:

I just got an Explore Scientific 80ED refractor and i have a bahtinov mask for my six inch reflector that fits perfectly on the dew shield of my new refractor but the actual lens is smaller than the dew shield. Will it still achieve focus? (i can’t test it right now because my dslr adapter is still being delivered and it’s cloudy)