> I felt you misused the term "Depth of Focus" in your original post, or
> at least placed it out of context.
> I almost replied then but couldn't be bothered ... but since you bring
> it up again.
>
> 1. DOF is indeed not the same as DOF ;o)
>
> 2. Wide aperture on ANY lens reduces DOField but decreases DOFocus.
>
> 3. Just as with DOField, DOFocus is a function of magnigication (is
> it not?) rather than focal length per se.
>
> (Please correct if you think I'm wrong, but it could go way off topic.
> If nothing else people might actually look the term up for themselves
> ;o)
Hi Bob,
I realize now that the original poster was talking about the 'focus
range', or the movement of the focus ring on the lens. I believe he was
right, in that moving the wide angle slightly off the mount, or using a thin
extension tube would change the focus drastically, since such a small focus
ring movement changes focus so much. In other words, I think a 12mm tube
will put the focus to extememely short range, and DOF will also suffer. It
just isn't an option at this short focal length I believe.
Get your tongue out of your cheek :-)
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