Optimum Apeture setting


Link Posted 01/07/2012 - 15:18
Could any one tell me what the optimum aperture setting is on the PENTAX D-FA 645 55mm F2.8 AL [IF] SDM AW lens?
Last Edited by alasdairfyfe on 01/07/2012 - 15:18


Link Posted 01/07/2012 - 15:32
It depends upon what you mean by optimum, but I suspect you mean highest resolution? Probably f8 - f11 or thereabouts. But I would expect this to be a very high quality optic where the standard is pretty even throughout the range.

For portraits the optimum aperture might be f2.8 - f4 to blur the background.

For landscapes maybe f16 to maximise DOF. The smallest aperture is usually best avoided, but the option is there where the absolute maximum DOF is required.
Best regards, John



Link Posted 08/07/2012 - 16:28
Many thanks John
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