This is wierd. We're having exactly the same discussion on my Rollei
Users Group List.
Michael King wrote:
>
> Ansel Adams, John Sexton, Fred Picker, etc. don't seem to think so. The
> f/64 group and their descendents eschewed the whole misty, soft focus school
> of photography and all used diffusion light sources on their enlargers.
>
> Mike
>
> >The reason I got curious about the point source is I have this nice 12v
> >100A light source with halogen bulbs. they're aligned in the housing
> >with some small condensers. But I'm hearing that I could probably buy a
> >used beseler 45 pretty cheap. I'm needing the 4x5 capacity because of
> >this camera I'm building which I'm trying to build as a super high
> >resolution camera. Is there a loss of sharpness with a diffuser source?
> >
> >Gene
> >
> >Gene
> >
> >Sid Washer wrote:
> > >
> > > Hi: No, there are no fumes to contend with in a zirconium short arc
> > > lamp- it's a teeny thing sealed into a ceramic housing with a sapphire
> > > window and provision for forced air cooling. Like most metal arcs, the
> > > voltage drop is on the order of 35-40 volts and the current runs to a
> > > few amps. The arc approximates a point source to a fine degree. They
> > > used to be somewhat expensive with their power supplies and I don't
> > > suppose that they've gotten any cheaper. But, no optics at all; it works
> > > like the inverse of a pinhole camera.
> > > bye, sid
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