I have a JML 6 1/4 inch f 8 process lens and a JML
8 1/4 f 8 process lens.. They both appear to be extreem wide angle lenses
.. Does any one know anything about these lenses , what they will cover
and what type of lens configuration is in them? The iris stops about 1/2
way with a maximum
Energy stored in capacitor [Joules] = 1/2 * C*V^2
C in Farads, V in volts.
I think the voltage is dumped into a transformer or trigger coil, which
might be an autotransformer.
Many xenon flashes have a lower arc voltage (tens of volts) and a trigger
voltage (4-10 kV depending on size) which goes
Well, maybe my email software cut me off since I went on too long.!
- Helioprint lens 1:8/150
Aperture range 1:8 - 1:64
At f/8: Angulare coverage 65°, image field diameter and
magnification 1:1 380mm
At f/22: Angulare coverage 68°, imag
OK - my experience & research.
I think shipping Atlanta to Holland Michigan was about $21-22 - I was the
only bidder and vaguely think $56 shipped. I subconsciously hoped they were
wrong about the weight and also convinced myself that the shipping was less
than I expected so of course it HAD to be
Some labs will give 'em up, some wont. I think they get some credit for
them. I offered one place to pay their deposit/credit value and in the end
they changed their mind...the manager couldn't "think out of the box"...just
couldn't deal with the idea.
I >think< they had 160 uF photoflash electroly
Hi folks,
Put the flash as close as possible to the subject to maximise the
illumination of the subject. Not close to the camera.
Brian
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As I recall the flash duration was shorter in duration with flashes
designed with higher voltage on the capacitor. Obviously capacity of
capacitor would have something to do with duration of course.You really
should read Eggerton's book on electronic flash.
As flash duration depends largely on the
