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> From: David Irisarri Vila <valicors@xxxxxxxxxx>
> To: olympus@xxxxxxxxxxxxxxx
> Subject: Re: [OM] Exposure compensation [2]
> Date: Saturday, May 23, 1998 8:56 PM
>
> Then if you see through the viewfinder and see (ie. 1/8s), you don´t
> have to be panic because the shutter is locked at 1/60s. Then, I can´t
> understand the OTF system, because when you shoot with flash you
> can meter the exact light comming to the surface of the film. Then,
> the shutter must control the speed increasing or decreasing as
> needed, don´t you?
>
Yes, in ambient mode, the shutter will control the amount of light to film
plan. In OTF flash mode, if light are enough, the camera circuit will send
signal to the flash and cut the light output.
> What does mean sync 1/60 or slower? If I want to fire at 1/15 with
> flash, I must put the camera in manual mode???
>
Yes.
>
> So, I would be a good idea to shoot with 100mm, having a good working
> distance in order to enhance the background light. I have problems with
> this because I use a Zuiko 50mm/f1.2, don´t you?
>
So, what you have to do may be try to frame in a larger portion of your
object and depends on the situation, set the exposure compensation to -1/3
to -1 stop.
>
> Could you please explain me what is GN-distance?
>
GN is stand for Guide Number, e.g. Olympus T32 quoted GN 32/m. At full
power out, if your object is 1m from the flash than you have to set your
lens to f32; 4m set to 32/4 = f8 ...etc. Please note the actual GN figure
of you flash may not be same as quoted. Also, if there is strong ambient
light, you have to account for that. For ambient light of two stop or more
under, you may ignore it.
C.H.Ling
> Best regards
>
> Dave
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