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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