Sigma 300 f2.8 canon +2 & +1.4 stacked

[BALDYMAN]

Just thought i would try this to see how quality was, I was suprised.
800 iso , in good light on the 5d it still auto focuses ( i do have the +1.4 modded with tape) What do you think?

 

[markgray]

Thats still very sharp, nice shots

 

[CT]

That's pretty good. As long as you're sticking the two converters behind a quality prime lens I find the results very acceptable.

 

[Joe T]

Thats very good indeed considering. I would imagine my 120-300 2.8 with similar converters would give most (maybe 80-90%?). Now I need to learn how to shoot birds