warrenvon wrote:
Regis . . . I've been forwarding your osprey images to a canon friend. This has generated a question from him:
"It is indeed a great shot...
BUT... I STILL cannot reconcile his shooting specs:
Canon 5Dsr - Canon 400 II DO f4 - Canon 2.0x III - 1/1328 - f/10 - ISO @ 1000
His 400mm prime is an f/4. With a 2x converter, his effective aperture is f/8, which in itself is fine b/c his 5Dsr can probably AF at f/8 (perhaps with just the central AF point but that's all he needs)
BUT... he is claiming an f-stop of f/10. If that is true, then to the best of my understanding of Canon AF, he must be manually focusing. Which, if true, his capture is even that much more remarkable.
Warren... can you clarify my understanding of his shooting specs with him? I don't have an account."
Regis . . . I've been forwarding your osprey image... (
show quote)
I don't mean to be out of place but I shoot very often with Regis and will answer this for you. The camera will auto focus at F/8 and above. You can set the lens to f/10 to f/32 and his camera will still auto focus. The camera and lens including the use of a converter be it a 1.4 or 2X will work as long as the maximum aperture does not exceed f/8.0. The camera will auto focus at f/8.0 and will stop down to the aperture set when it takes the picture. As fast as this action is I don't know very many photographers that could manual focus because you never know where the action will be. It would be a easier photographing eagles as they are somewhat predictable but no easy task.