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Teleconverters, DOF and f Stops?

drueke

Little Compton, RI, US
10 posts

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drueke Silver Member Nikonian since 24th Oct 2008
Wed 28-Sep-11 09:45 PM

Hi,
I understand most of the aspects of using a teleconverter to 'extend' reach. With a 2x converter, I double the focal length and loose 2 f stops.

Using an 85mm lens and 2x for example, the DOF for 40' and f16 will be ~33 to 50' or a spread of around 16'. Ok, what do I set the aperture at on the camera? I'm thinking f8 (down 2 stops at the lens) will give me f16 at the sensor? BTW the spread at f8 is only about 8'.

So what's the setting on the camera? f8 or f16??

Thanks,
Ray.


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