50mm 1.8 - when would you use such a wide aperture?

Started Mar 23, 2007 | Discussions thread
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Meyricke Contributing Member • Posts: 659
DOF issues

I have just bought one of these for use on my D40. Achieving focus manually has been easy enough - achieving the right focus is another matter. I managed some excellent pictures in a concert hall foyer of two musicians. The problem being that I could only ever get one of them in focus at a time at 1.8. I needed to close the lens down to about 2.5 to improve that, with resulting increase in shutter speed.

Is there any easy way of discovering the size of the "focus point" at different f stops, other than just experimenting?

Can't attach images as I'm at Singapore Airport at the moment.

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Meyricke
Nikon D40, CP5700 & Photopaint

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