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Old Oct 20, 2004, 11:23 AM   #1
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Where thereis more than 1 person, how do I make sure all of them are in focus as DOF is so small at f1.8. Right now I am using 50mm f1.8. Will 20mm f1.8 help or one has to use smaller aperture and flash. Any inputs are appreciated.
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Old Oct 22, 2004, 2:55 AM   #2
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You don't HAVE to leave it at 1.8 aperture in low light situations. Increase the ISO setting (400, 800, 1600), use a different aperture setting, and use the center focusing point.

Lens Spec for 50mm f1.8 :

f/Stop Range 1.8-22
Minimum Focus Distance 1.5'
Magnification 1:6.66
Zoom/Focus Control Not applicable
Angle of View 46 Degrees
Groups/Elements 5/6
Length 1.6"
Maximum Diameter 2.7"
Weight 0.29

Here's an example from a EF-S 18-55 kit lens in a low light situation. TV= 1/80, AV 3.5, centerweighted, ISO 1600, Focal length 18mm.
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Old Oct 22, 2004, 5:46 AM   #3
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A smaller focal lenght will increase the DOF, you can check its DOF here: http://www.dofmaster.com/dofjs.html
... it'll also determine a lens hyperfocal distance for a set aperture
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