[LRflex] Re: Focal Plane Shutter Distortion.

  • From: David Young <dsy@xxxxxxxxxxxxxxx>
  • To: leicareflex@xxxxxxxxxxxxx
  • Date: Tue, 02 Feb 2010 10:55:06 -0800

At 2/2/2010, you wrote:
>You sparked a curious question in my mind.  The retired science teacher part
>of me came back to life.  A bit of math.  Traveling at 115 kph, the bike
>would move about 3 cm in 1/1000 of a second.  Since the wheel occupies maybe
>1/4 of the vertical frame (vertical shutter) it would move about 0.75 cm
>during the exposure.  I don't think 0.75 cm would make a detectable
>lengthening of the wheel, do you?
>
>This in no way detracts from the great shot, just, in my mind, casts doubt
>as to the distortion effect seen.
>
>Aram


Hi Aram!

OK... so rain on my parade! ;-)

I thought I might be on to something interesting ... but, after 
looking at your math, you are right.  I concede... it's the angle.

Cheers!

---
David Young
Logan Lake, Canada.

Wildlife Photos: www.furnfeather.net
Personal Website: www.main.furnfeather.net
A micro-finance lender though http://www.kiva.org

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