The original issue was depth of field, which Richard correctly adressed. You
bring in shutter speed, which is different issue than depth of field.
Shutter speed is not directly related to depth of field.
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Christopher A. Young
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"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in message
. 3.70...
Richard fired this volley in news:s4CdnUvUw4tXN-
:

I think you have that backerds, hoss.

Higher F numbers mean smaller aperture diameter.
Depth of field increases with f-number

Reducing _aperture_ increases depth of field.

An shutter speed is not involved (directly, anyway)

I think you completely mis-read what he said. You just _repeated_ it
(correctly), except for disallowing that small apertures require longer
exposure, which he had wrong and you correct.

But you were wrong about one thing: For a given 'speed' (film, CCD,
anything), shutter speed IS directly involved. The smaller the aperture,
the longer the exposure for a given level of illumination.

LLoyd