[LRflex] Re: [LRflex] Focal-plane shutter distortion of aëroplane propellers
- From: Charlie Falke <chfalke@xxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Wed, 03 Feb 2010 17:51:52 -0500
On 2/3/2010 5:20 PM, Jeffrey L. T. Gluck wrote:
> Apropos of this discussion, I recall seeing interesting pictures of
> focal-plane shutter distortion of aëroplane propellers. If anyone has a
> link, please post it. I saw it several years ago but lost the link. I'm
> sure most here are familiar with that.
> Jeff Gluck
>
Jeff,
Here are two. The first is from Wiki, and shows severe
distortion of helicopter main and tail rotor blades, including
the blades' shadows not corresponding to where the blades are.
This was taken with a DSLR, according to the text.
http://images4.wikia.nocookie.net/chdk/images/4/46/Focalplane_shutter_distortions.jpg
The next one I almost sent after the discussion on FP distortion
during panning. This was almost certainly shot with a Speed Graphic,
in any case the shutter moves from the top of the camera to the
bottom during the exposure, which means from the bottom of the
image to the top. The bottom of the hangar is exposed first, and
as the camera is panned to the left, the hangar moves to the right,
but only a thin slice is exposed at a time. The airplane looks
pretty good, the photographer did a good job panning.
There are two propellers on an XB-42, turning in opposite
directions, the front propeller turns in the normal (for the US)
direction of right handed, that is clockwise from the rear.
The rear propeller turns the other way. The blades are not
tapered at all, all the appearance of sweep is due to the shutter.
http://www.nationalmuseum.af.mil/shared/media/photodb/photos/060912-F-1234S-006.jpg
If you do a close up with a Speed Graphic using the body shutter, you can
get a blade curved all the way around and back the other side of the rotor
hub.
--
Charlie Falke _____ /\
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|(____\/_________/
"One test result is worth | |/ `o
one thousand expert opinions" - Wernher Von Braun 0 N4003M
"Imagination is more important than knowledge" - Albert Einstein
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