Roy C
Occasional bird snapper
That's 1344mm on the 7D2 then Jeff - useful if the IQ is OK with a converter. Interesting that it works OK with the Canon 1.4x II as well.i have just tried mine with a canon 1.4 mkii t.c and the a/f is fine at 600mm and playing around earlier today using the 10mtrs to infinity limiter the lens focussed as fast at 600mm as a canon 400mm f5.6 prime ,its obviously slower at full focus range but thats not what its designed for .just waiting for a bit of decent weather to try it properly the freezing fog has been hanging over head for 3 days now ,not a breath of wind either .
to sum up on a 1.6 crop sensor you get a maximum of 960mm range .
and with a 1.3 crop sensor thats f8 enabled you get a maximum of 1092mm with full a/f
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