Here is a question for you techies out there!
After reading a few posts on shooting with the Canon 60mm Macro behind a minidome I decided to try it out today in the pool before heading to Australia to hopefully shoot some seadragons and other medium sized subjects.
I have a Canon 7D, Canon 60mm USM, AquaticaA7D housing, Aquatica 100mm minidome and Aquatica extension rings.
I tried it 3 different ways:
1: Without extension ring, it could hardly focus, it would only focus on subjects >50cm from the front of the lens but even then with a lot of "searching" for focus.
2: I tried it with the 18456 (16,5mm) extension ring, and that helped but I still did not get 1:1 magnification, minimum focus distance was still increased and the focus was still a bit slow
3: Finally I tried with the 18453 (28,5mm) extension ring and it worked well.
Can anyone explain to me why this is? It seems that other people have managed to use the 60mm without any extensions?
Best regards, Morten