800mm lens with a 2x teleconverter?

Started May 11, 2012 | Discussions thread
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Re: 800mm lens with a 2x teleconverter?
In reply to zofo75, May 11, 2012

zofo75 wrote:

wow, thats gonna slow it down a lot.

I thought it was going to go down by 2 stops, not double...

two stops is always double. f8-f16 is just like f2-f4.

will it still be usable at f16?

Barely. Liveview might help, but the viewfinder is going to be DARK. I tried a similar setup with 3 teleconverters on a 180mm f3.5 prime lens (Giving me 1100 f19) and it was pretty hard to see through the viewfinder on a sunny day!

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