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[OM] Re: Fill-Flash Questions

Subject: [OM] Re: Fill-Flash Questions
From: gries@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Date: Tue, 16 Mar 2004 15:02:07 -0600
Uh, the short answer?  get an F280. ;)

Seriously though I think fill flash with slide film is even more difficult 
because of the tight exposure latitude.

I don't usually trust AUTO mode, so my process for getting fill 1 stop under 
from ambient would be to use GN.  With the flash sync at 1/60, one is limited 
when outdoors - thus the beauty of having Super FP.

For your example, I would determine the exposure for 1/60 then move the correct 
distance for flash to give 1 stop under what you have metered.




------------------------------------------------
On Tue, 16 Mar 2004 12:00:45 -0800, Rob Harrison <robhar@xxxxxx> wrote:

> 
> I'm new to using flash--always been a natural light kinda guy. But even 
> old dogs want to learn new tricks sometimes. I've read about this a few 
> different places, but somehow still not convinced I completely get it.
> 
> OK, so let's say I'm outdoors shooting a portrait against the sun. I 
> want to use fill flash. Is this how I would do it?
> 
> 1) With an OM-4ti...
> 
> a) Let's say I have a T32 flash.
> I switch the camera to auto, set the flash to TTL. I meter the ambient 
> light, set the aperture for a value that allows a shutter speed of 
> 1/60th or less. Let's say I'm using Reala, and f11 works. ASA100, 
> 1/60th @ f11. (But does the 4ti automatically switch to 1/60th?) I 
> change the _ASA_ setting (not exposure compensation) to ASA 200. Take 
> the photo. This gives me a fill of one stop under ambient light. Right? 
>   I can dial in any amount of compensation this way actually, in 1/3 
> stop increments, up to the limit of the ASA wheel. OR...if I know I 
> want TWO stops under, it looks like the T32 has a 1/4 power setting. 
> Right?  Or is there a simpler way (I hope)? I think what's confusing 
> for me is how the TTL-OTF flash, and auto mode of the camera, interact.
> 
> b) Another flash with 3 auto apertures-- say 2.8, 5.6 & 11.
> I meter ambient light. For flash one stop under ambient light, I choose 
> an aperture on the camera that's one stop smaller than one of the auto 
> apertures on the flash. Let's say f8 at 1/60th works for ambient light. 
> I change the flash to its auto setting of f5.6. I can vary the ratio of 
> flash to ambient light by the difference between the auto aperture on 
> the flash and the camera aperture--# of stops camera aperture is 
> smaller than auto aperture on flash = # of stops less flash, more 
> ambient light. In this case, a flash that offers a large number of auto 
> options is quite useful.
> 
> 2) With an OM-1...
> 
> a) same as "1b" above, or...
> b) with flash on manual setting, do the guide number/distance = 
> aperture calculation, then either cut the power in half on the flash 
> (for one stop under), or choose a one stop smaller aperture on the 
> camera that still allows proper exposure of ambient light.
> 
> Whew.
> 
> Please, enlighten me if I'm totally off on this. I'm going to try 
> shooting a roll of slide film to test these approaches, thought I'd run 
> it by you all first.
> 
> Cheers,
> Rob Harrison
> Seattle
> 
> 
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