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RE: [OM] OM2S only does 1/60th, sort of?

Subject: RE: [OM] OM2S only does 1/60th, sort of?
From: "Daniel J. Mitchell" <DanielMitchell@xxxxxxxxxxxxx>
Date: Mon, 13 Aug 2001 13:24:16 -0600
> I always thought that it must distort the picture a bit, having one 
> side exposed later than the other, but I suppose it doesn't 
> matter much, except for _very_ fast-moving objects.

 Hm, perhaps I should do some math and work out when it really _does_
matter.. 

 Say I'm taking a photo of a car driving past at 80mph, but let's do this in
metric for sanity's sake, so call it 120kph, near enough. And imagine I have
the camera aligned vertically, so it'll be moving perpendicular to the
motion of the shutter.

 Imagine I'm 20m away from it; how far across the field of view does it move
in 1/60th of a second? Bit of trig, and it'll move 16 degrees through the
field of view during that time. Assume I'm using a 50mm lens, angle-of-view
there is 47 degrees, so it'll smear across roughly 1/3 of the image. Now,
assume something more realistic; 200mm lens = 12 degree angle of view, and
I'm 100m away, same speed. Now it covers 10f the image, which is still a
bit iffy, but a lot more manageable.

 I guess what this does tell me is that the shots I took on the weekend
should come out just fine, given that nobody was moving anything like that
fast.

 -- dan

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