Hi
I recently acquired a 2nd hand Astronomics field flattener (
AT2FF) and finally got a chance to try it out on my ED80 last night. The results were more than disappointing as the flattener made everything much, much worse. I don't have photos on hand but the stars in the corners/sides were way more "elongated" than on the ED80 alone. I tried it on Canon 1200D and on Nikon D90, same results.
I am sure I am not using it right. I had the following configuration:
ED80 <-> AT2FF <-> T-ring <-> camera.
Thinking of the distance between the shoulder of AT2FF and camera sensor:
1200D with 10mm thick T-ring gives distance of 44 + 10 = 54mm which is within AT2FF required 57mm +/- 4mm.
D90 with 8mm thick T-ring giving 54.5mm distance. Again within specifications.
Any ideas what I am doing wrong?
Thanks