This is How Cameras Glitch with Photos of Propellers

http://petapixel.com/2015/11/14/this...ith-photos-of-
propellers/

The fact that rolling shutter messes up a photo of a rotating airplane
propeller isn't news, but this is a pretty neat way to show exactly how it
happens.

--
Sandman

On Fri, 20 Nov 2015 20:34:58 -0800 (PST), RichA
wrote:

On Tuesday, 17 November 2015 14:43:25 UTC-5, Sandman wrote:
http://petapixel.com/2015/11/14/this...ith-photos-of-
propellers/

The fact that rolling shutter messes up a photo of a rotating airplane
propeller isn't news, but this is a pretty neat way to show exactly how it
happens.

--
Sandman

What if you shoot fast enough to stop the propeller? Can it be stopped with an exposure of 1/8000th-1/16000, typical for high-end cameras today?

No.

All that happens is that the shutter rolls across the sensor just as
fast/slowly as before but with a narrower slit/opening.

I once use a Graflex to look down on a hill climb track and ended up
photographing a perfectly blank stretch of road. The slit in the
shutter blind tracked across the film at a nice sedate pace and never
caught up with the image of the car.

True :-)
--

Regards,

Eric Stevens

On 11/21/2015 03:07 AM, Eric Stevens wrote:
On Fri, 20 Nov 2015 20:34:58 -0800 (PST), RichA
wrote:

On Tuesday, 17 November 2015 14:43:25 UTC-5, Sandman wrote:
http://petapixel.com/2015/11/14/this...ith-photos-of-
propellers/

The fact that rolling shutter messes up a photo of a rotating airplane
propeller isn't news, but this is a pretty neat way to show exactly how it
happens.

--
Sandman

What if you shoot fast enough to stop the propeller? Can it be stopped with an exposure of 1/8000th-1/16000, typical for high-end cameras today?

No.

All that happens is that the shutter rolls across the sensor just as
fast/slowly as before but with a narrower slit/opening.

I once use a Graflex to look down on a hill climb track and ended up
photographing a perfectly blank stretch of road. The slit in the
shutter blind tracked across the film at a nice sedate pace and never
caught up with the image of the car.

True :-)


Back in my high school days, I used a 35mm focal plane shutter with a
strobe to shoot a basketball gym in our small school's gym. I have a
shot with a jump ball, where the strobe was enough to stop the action,
but the ball was directly between a light fixture and the camera. The
ball is frozen, but the light fixture appears right in the middle of the
ball.

--
Ken Hart

On Sun, 22 Nov 2015 14:26:05 -0800 (PST), RichA
wrote:

On Saturday, 21 November 2015 03:07:34 UTC-5, Eric Stevens wrote:
On Fri, 20 Nov 2015 20:34:58 -0800 (PST), RichA
wrote:

On Tuesday, 17 November 2015 14:43:25 UTC-5, Sandman wrote:
http://petapixel.com/2015/11/14/this...ith-photos-of-
propellers/

The fact that rolling shutter messes up a photo of a rotating airplane
propeller isn't news, but this is a pretty neat way to show exactly how it
happens.

--
Sandman

What if you shoot fast enough to stop the propeller? Can it be stopped with an exposure of 1/8000th-1/16000, typical for high-end cameras today?

No.

All that happens is that the shutter rolls across the sensor just as
fast/slowly as before but with a narrower slit/opening.

I once use a Graflex to look down on a hill climb track and ended up
photographing a perfectly blank stretch of road. The slit in the
shutter blind tracked across the film at a nice sedate pace and never
caught up with the image of the car.

True :-)
--

Regards,

Eric Stevens

Thankfully, this is like moire, you don't see it too often in normal shooting. I guess the most iconic image displaying it is the race-car one where the wheels of the car are ovals.

e.g.
http://www.vanderbiltcupraces.com/vc...-16_edited.jpg
or http://tinyurl.com/ngkd2js

There is a much better shot somewhere but it seems to have
disappeared.
--

Regards,

Eric Stevens