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[OM] Re: F280 question

Subject: [OM] Re: F280 question
From: Tim Hughes <timhughes@xxxxxxxx>
Date: Mon, 28 Jan 2008 10:50:09 -0800 (PST)
Yes the f280 is exactly like an incandescent light, so the camera just 
calculates exposure in full
auto by integrating the combined result of "continuous" flash level with 
ambient level. 
Adding a diffuser/ND filter over the flash is the only way of reducing the 
relative contribution
over ambient. I always like to add layers of tissue paper or cut pieces of 
plastic milk container
to cut light from flashes, when they prove to be too bright on minimum setting.

Tim Hughes



--- Chris Crawford <chris@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> I think the F280's output is always the same in FP mode, it can't be dimmed.
> The exposure is controlled by aperture and shutter speed both, which also
> affects ambient exposure. This is unlike normal flash where background
> exposure is controlled by the combination of aperture and shutter, but only
> the aperture affects the flash exposure. So I think your only means of
> changing the F280's output is by controlling flash-to-subject distance, or
> by putting neutral-density filters over the flash to dim it if its too
> bright.
> 
> I actually have an F280 purchased a decade ago and really never used for the
> FP mode. I should get it out and play with it.
> -- 
> Chris Crawford
> Photography & Graphic Design
> Fort Wayne, Indiana
> 
> http://www.chriscrawfordphoto.com  My portfolio
> 
> http://blog.chriscrawfordphoto.com  My latest work!
> 
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> 
> 
> 
> On 1/27/08 9:47 PM, "usher99@xxxxxxx" <usher99@xxxxxxx> wrote:
> 
> > 
> > Still looking for easier macro fill flash for OM? besides manual which is 
> > even
> > slower now as I have more possible combinations. I need to finish my tables 
> > of
> > light loss from extension.? Have never laid eyes on one of these beasties 
> > but
> > I certainly know where to ask about them.? It seems that the fill is a bit 
> > on
> > the bright side judging from some old posts (?-1 or so).? Wonder if the 
> > degree
> > of fill can be modulated by changing the ISO on a 4T?  with a reciprocal
> > change in the exp compensation.? Increasing the ISO by one stop with exp
> > compensation of +1 seems to work ala John Lind with the T-series for 
> > "bright"
> > fill. (not really fill, but increases the flash over ambient)? It is not 
> > clear
> > that changing the exp compensation will alter the output of the F280 in FP
> > mode.? Perhaps all the changes do are cancel each other out. So the the
> > question is if that is a workable strategy.? The down side in any event is 
> > the
> > flash won't fire in FP mode with speeds under 1/60th. One extra litt
> >  le dial on the 4T would be so much easier though doing it correctly 
> > manually
> > may teach me more in the long run. One can also use distance to modulate the
> > fill of the F280 in manual, though that is not very fast either.? I like
> > manual and auto for most things though chasing critters or hiking in the 
> > woods
> > with changing magnifications makes TTL attractive.
> > I even saw one old post that claimed the fill was modulated by a thyrister 
> > on
> > the F280,sort of an auto mode, and not TTL.
> > That doesn't seem correct. Perhaps I am staying up too late.
> > Thanks for any comments.
> > 
> > Mike
> > 
> > 
> > 
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