Fill flash. What I have learned.
The shutter speed is set to 1/60. You generally do not want Aunt Mable's
artichokes in focus with the portrait style shot of the people. So go a slow
speed to use a wider aperture and limit depth of field.
Lets say you are at 4 meters, the aperture is f4. With 25 ASA film, these
are perfect for the T32. But this is full power. If the ambient light gives
you f4 at 1/60, and so does the flash, the fill effect is very pronounced.
Generally you want a fill ratio of 1:2 or 1:4. So you have your exposure,
you need to limit the flash.
Normal Auto.
If htere is a f4 setting on the flash, do not use it. It will be correctly
(1:1) exposed at this value. Select it to f2 or f1.4. These settings
actually make the flash more sensitive, as it expects some light reflection
from further away. These are two or three stops from a 1:1 fill ratio.
Fully manual
Sometimes, you cannot get the right normal auto setting. Go manual. If you
need to drop the flash by 1 stop, put one finger over the flash. Two stops,
two fingers. You can use filters to reduce the light output, but depending
on what you are photographing, you may not have time. If the flash has many
manual settings, use these.
Summary
1. Select the film speed for depth of field in the expected light at 1/60
2. Set the flash output to be less than the required at that aperture.
3. Impress everyone by putting your fingers in front of your flash head.
4. A flash in non TTL mode will not accept the quench signal from the
camera.
Foxy
----- Original Message -----
> If I put a non-TTL "normal auto" shoe mount flash (like a vivitar 283)
> on a TTL camera like a OM2n, and put the OM2n into auto mode, will the
> camera provide correct exposure by taking into consideration the light
> from the flash? In other words, do the light sensors in the OM2n
> respond to strobe light without a T series flash attached?
>
> The reason I ask is because it appears at least to be impossible to
> independently control depth of field (via apeture settings) and strobe/
> ambient light ratios with a T series flash installed. For example, with
> a T series flash on a OM2, with both set to "auto", the ratio of strobe
> to ambient light is only controlled by the apeture setting (open up for
> more ambient light but get less depth of field). With a "normal auto"
> flash that has an independent film speed setting (or even power setting
> with sunpak flash), you can fool the flash into outputing less power by
> setting the film speed on the flash to a higher ISO number than what's
> actually in the camera. (100 speed film in the camera, set the flash to
> 400 (200?) for half power).
>
> Basically, I want to know if the above "trick" will work with the ttl
> auto OM2.
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