Canon’s new 600mm and 800mm lenses

Started 3 months ago | Discussions thread
alanr0 Senior Member • Posts: 2,326
Re: Canon’s new 600mm and 800mm lenses

Old Greenlander wrote:

Chris in UK

tell me how you get a shallow DOF with those lenses...

How shallow do you want?

At 10 m distance, assuming 0.03 mm Circle of Confusion, DOFmaster tells us that depth of field extends from 9.95 m to 10.05 m for the 800 mm lens at f/11.

For a portrait, it will be tricky to get nose and ears in focus at the same time, if the subject is facing you.

At 6 m minimum focus distance, total depth of field is probably less than 40 mm for the 800 mm lens (depending on the pupil magnification and the working f-number), with a similar value for the 600 mm f/11 at its 4.5 m minimum focus distance.

Predicted total DoF at f/11 nominal aperture is 34 mm at maximum magnification 0.14.

Hyperfocal distance is 1.9 km.

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Alan Robinson

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