LMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6
Reply 5, posted (11 years 1 month 2 weeks 5 days 23 hours ago) and read 3827 times:
It's almost impossible then. Does anyone use a Canon 300mm with a 2x converter? I have trouble focusing. The only way to AF is to select either of the extreme focus points manually and pre focus on a point. It is impossible to us AF when pressing the trigger. The lens will just go hunting.
Mirage From Portugal, joined May 1999, 3125 posts, RR: 14
Reply 6, posted (11 years 1 month 2 weeks 5 days 23 hours ago) and read 3805 times:
it's normal, I was using an EF 75-300 IS sometimes with the Canon 2x but it's like you said, lots of trouble, out of 10 photos maybe one satisfactory and never razor sharp images, always a compromisse between long range and average quality.
Ckw From UK - England, joined Aug 2010, 763 posts, RR: 16
Reply 7, posted (11 years 1 month 2 weeks 5 days 17 hours ago) and read 3761 times:
I use a 300mm f4 with 2x (and sometimes 2x & 1.4x convertors) and just use manual focus - at long focual lengths, I don't find manual focus too much of a problem as the difference between in focus and out of focus is readily apparent. Try using MF for a while - a little practice and you'll be fine.