[Tig] plane of focus (still cam)?
rob at colorist.org
Wed Mar 12 14:05:01 GMT 2008
On Mar 10, 2008, at 10:34 PM, woz wrote:
> How well defined was the edge of the 'stain'?
quite defined. It had all the properties of a stain if you looked at
it on a drinking glass, for example.
> Have some greasy food (joking!) put a print on the lens and shoot a
> plain background at f5.6, f11 then f22 and if you have it f32 (never
> mind the diffraction effects we'll assume they are
> insignificant);.also have you considered the possibility that the
> print on the lens could cause flare with certain light directionality?
it wasn't so nice a photo as you describe; it was fairly flat in
focus, like 5.6 or so, and used flash. But... now that I've cleaned
the objective lens, and took the same shot again, it's gone. I
didn't realize that depth-of-field on CCD cameras could show such
anomalies. Now I know my next entreprenurial entreprise: Digital
Lens Cleaner. You use it with your fingers and a Digital Lens Wipe,
which conforms to Digital Standards, and the fluid can be broken down
into digital form, ...... (the analogy fails at this point).
> Vaporous! Now there's a word I would not have thought to use, I hope
> you don't mean miasmic!
miasmic is what I found prevalent in the machine room when entering
after someone else had just left. Or, when one enters a supermarket
aisle in an unprepossessing manner, then shortly later realizing an
emanating presence had been there before you.
rob at colorist.org http://www.colorist.org/robhome.html
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