On Mon, 22 Apr 2013 16:35:16 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

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.

Numbers Lloyd..not physical diameter.
f 1.2 is a lower NUMBER than f32. Bigger hole....smaller number.


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.

Correct.


LLoyd


LLoyd