Re: Image tech disposable & flash

[P3D Greg Erker <erker@xxxxxxxxxxxxxx>]

>Aperture is f/11
>focal length is 27mm using three aspherical lenses.
>Shutter speed is approx 125th sec.
>
>Current models are loaded with AGFA 400 ASA film,
>earlier models used SCOTCH 400 ASA.

  Print film likes to be overexposed rather than
underexposed. Or more technically has more lattitude
for overexposure than underexposure.

  That's why they can get away with the above
(fixed) settings on a sunny day. 400 speed film
would be correctly exposed at 1/400 and f16 but
they are overexposing it by almost two stops due to
a slower shutter speed and one stop due to f11
vs f8. A total of 3 stops overexposure.

  If you have enough flash power you may want
to go for an aperture of f16 rather than f11.

  Many flashes don't have settings for such
high f#'s. You can trick the sensor by covering
it with some neutral density filter (ND). An
NDx2 will let you shoot at one stop smaller
(higher f#) than marked. An NDx4 gives two
stops. Flash range is reduced to 71% and 50%
in these two cases (from the marked range).

  If you don't have any ND filters to cut up
I found that the lens from a polarizing 3D
glasses is almost exactly an NDx2. (A camera
polarizer measured almost exactly NDx4).
This makes the flash sensor sensitive to
polarization but the flash light bouncing
back from most subjects will be randomly
polarized. I haven't had a problem with doing
this on my Metz 45.

Regards - Greg E.

http://www.angelfire.com/ca/erker



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