Re: OT: camera for small work
On Mon, 22 Oct 2007 19:27:12 -0400
"Douglas A. Tutty" <dtutty@porchlight.ca> wrote:
> On Mon, Oct 22, 2007 at 11:52:24PM +0200, Micha Feigin wrote:
>
> > not sure about macro work, but consumer digital cameras have a
> > rediculous depth of field due to the tiny ccd. Thats one of their big
> > issues in proper portrait work.
> >
> > anyway, not sure if there is a linux driver or anything more then an
> > api but I know that the canon a740 (not very cheep but a very nice
> > camera if you also want to use it later) has the possibility of
> > working as a webcam. I don't think that earlier ones have the
> > interface. I can try to ask what interface exists (have seen it done
> > on windows)
> >
> > At least the older nikons don't have that ability either.
> >
> > As said before though, what about a good magnifying glass, or is this
> > an excuse to also spring for a digi cam
>
> A bit of an excuse. Also a bit of safety. I'll be using 1.5 mm chisels
> on buffalo horn in a work field 3 cm x 1 cm x .5 cm deep. A loupe has a
> focal lenght of under a couple of inches. Do I really want my eye ball
> within a couple of inches of the tool and the work? A really good large
> magnifying glass is about the same price as a medium grade digital
> camera.
>
> I know that my Nikon film SLR and macro lense works. I would think that
> there is no inherent reason why any digital camera with an LCD real-time
> viewer couldn't be capable of this. Whether they actually put that
> capability into the camera is a different story best answered at the
> camera shop. The only question then will be if there is a driver in the
> linux kernel that will work for the camera.
>
> The Nikon Digital SLR is, I think, an 18 MP camera with good depth of
> field; don't know if it can hook up with a USB as a webcam. The
> Panasonic 8 MP cameras with a macro funcition built-in have an adequate
> depth-of-field; ditto.
>
unless you can fork the 5500$ at least for the Nikon D3 which IIRC can output
real time video, an slr will not do the job. Digital SLRs have a mechanical
shutter so the lcd is exposed only when you take the picture. No real time
feedback even to the lcd not to mention external feedback. Plus, most digital
SLRs have an aps sized ccd/cmos which means a 1.5+- focal length multiplier and
a depth of field close to that of a film SLR (a bit bigger at the same
f-number/magnification).
Compact digital cameras have a digital shutter (only an electronic circuit, no
physical shutter). They thus have real time updating of the lcd and
theoretically possible external screen. Like I said, one of the cannons I think
it was the canon a640 can do it with the windows software (my sister is very
happy with the a620), don't know about linux. I think some sonys can do it also,
don't know which ones and there less of a chance for linux support.
> Doug.
>
>
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