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Re: [OM] OM= 3Ti & 280 flash

Subject: Re: [OM] OM= 3Ti & 280 flash
From: "Paul D. Farrar" <farrar@xxxxxxxxxxxx>
Date: Fri, 17 Jul 1998 19:34:13 -0500
At 01:16 AM 7/17/98 EDT, ONLYOLY wrote:
>In a message dated 7/16/98 2:10:08 PM Pacific Daylight Time,
>farrar@xxxxxxxxxxxx writes:
><< I was under the impression that daylight fill with the OM-3Ti-F280
> combo in FP mode was very simple. For -2 stops fill in sunny f/16, set 
> the camera for ambient light, then take the picture at a distance of 
> 1.4m. I don't have a F280 so I can't try it.
> Paul Farrar >>
>Hi Paul,
>Wish it was that simple. What happens at 3,4,5,6 meters?  Where did you hear

At 3m, -4 stop fill. At 4m, -5stop etc. 

My understanding is that it behaves as a constant light source, like a quartz
light. It has a strength that gives a sunny f/16 exposure at 0.7m, so at 1.4m
it is 2 stops below the sunny f/16 of the ambient light.

>or read of this.  All I have for reference is my 3Ti instruction manual and a
>280 instruction manual dated (0491) so it does not list the fairly new 3Ti.
>Per the chart, (wait let me get my 3" magnifying glass, I think it is around
>here somewhere) Auh yes. With ISO 100 @ 1.5m = f1.4 @ 1/2000sec+; 1/1000sec @
>f2.8; 1/250 sec @ -f5.6.  But the chart says it does not include natural
>lighting so the actual settings may differ.  Hum, I wonder by how much?  I

Let's load up with ASA 125. Go outside; that's 1/125-f/16, or 1/250-f/11.
We want a -2 fill, so we need the distance where the flash would expose at
1/250-f/5.6, which is .... 1.5m!

>have used the 280 FP mode on my 4T in auto for fill and it works pretty good.

Should work OK, if you don't get too close. Then the background will start
going dark. If you are far away, it just doesn't do anything.

The test I want to run, if I get one is:
Put a person outside in direct sun so shadows appear on the face. Take a
series of shots at different distances, using a zoom to keep the subject
size constant.
Evaluate the effect.

>So, I have resided myself to just use TTL mode on the 3Ti.  Maybe I should
>make a copy of this little chart and glue it to the back of my 280.
>I all fairness, I think the 280 FP mode is a great feature and has some
>possibilities worth exploring if I truly understood this feature and all the
>benefits it has to offer in both auto and manual modes.  But, I do not, and
>Olympus has done a terrible job with their instruction manual to educate us.
>I have been playing with the 280 in FP mode for close-up photos.  I think
>there is some real possibilities using high speed sync for fill in flash that
>will not "black" out the background.  But I have a long way to go to
>understand this.  I understand Nikons flash instruction manual is 99 pages
>long.  Maybe Olympus thinks we are all P&S shooters?  
>If anyone can give me some pointers on this subject, please do so.

There is an article on the Web by Andrew Davidhazy.


see what you think of it.

Paul Farrar

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