Jato, Pt 2 - C-119.jpg (1/1)

[Mitchell Holman]

[wild1bill]

Now that's awesome. Thank you.

wildbill.

"Mitchell Holman" > wrote in message
...

[wild1bill]

Now that's awesome. Thank you.

wildbill.

"Mitchell Holman" > wrote in message
...

[Oviedo]

Is it an optical illusion, eye strain, or are the props bending?

[Oviedo]

Is it an optical illusion, eye strain, or are the props bending?

[Peter Twydell]

In message >, Oviedo
> writes
>Is it an optical illusion, eye strain, or are the props bending?
>
>
This effect can happen with focal plane (?) shutters, which are in
effect a gap moving across the film. They do not see everything at once.
Imagine the shutter opens when a blade is horizontal (at 3 o'clock) and
rotating clockwise. At that point the shutter sees the blade root. As
the shutter goes from left to right (for example), it sees the next part
of the blade in a slightly lower position. By the time it gets to the
tip, that will be at, say, 5 o'clock. The image will therefore be
curved.

See here:
http://www.theaerodrome.com/forum/aircraft/24857-ot-spinning-propeller-qu
estion.html

Try Googling 'shutter curved propeller' or similar.

HTH
--
Peter

Ying tong iddle-i po!

[Oviedo]

"Peter Twydell" > wrote in message
...
> In message >, Oviedo
> > writes
>>Is it an optical illusion, eye strain, or are the props bending?
>>
>>
> This effect can happen with focal plane (?) shutters, which are in effect
> a gap moving across the film. They do not see everything at once.
> Imagine the shutter opens when a blade is horizontal (at 3 o'clock) and
> rotating clockwise. At that point the shutter sees the blade root. As the
> shutter goes from left to right (for example), it sees the next part of
> the blade in a slightly lower position. By the time it gets to the tip,
> that will be at, say, 5 o'clock. The image will therefore be curved.
>
> See here:
> http://www.theaerodrome.com/forum/aircraft/24857-ot-spinning-propeller-qu
> estion.html
>
> Try Googling 'shutter curved propeller' or similar.
>
> HTH
> --
> Peter
>
> Ying tong iddle-i po!

Thanks for the explaination!

The bending props is a unique effect.

[Oviedo]

"Peter Twydell" > wrote in message
...
> In message >, Oviedo
> > writes
>>Is it an optical illusion, eye strain, or are the props bending?
>>
>>
> This effect can happen with focal plane (?) shutters, which are in effect
> a gap moving across the film. They do not see everything at once.
> Imagine the shutter opens when a blade is horizontal (at 3 o'clock) and
> rotating clockwise. At that point the shutter sees the blade root. As the
> shutter goes from left to right (for example), it sees the next part of
> the blade in a slightly lower position. By the time it gets to the tip,
> that will be at, say, 5 o'clock. The image will therefore be curved.
>
> See here:
> http://www.theaerodrome.com/forum/aircraft/24857-ot-spinning-propeller-qu
> estion.html
>
> Try Googling 'shutter curved propeller' or similar.
>
> HTH
> --
> Peter
>
> Ying tong iddle-i po!

Thanks for the explaination!

The bending props is a unique effect.

[Richard Brooks[_2_]]

Oviedo said the following on 05/02/2009 23:02:
> The bending props is a unique effect.
>

Almost! The fashion advertising crowd had used that effect with
making racing cars and people lean right over some years ago and it's
made a come-back with the Matrix bullet-time array of cameras showing
people that look like that have been distorted in spirals.


<http://people.rit.edu/andpph/photofile-b/lartigue-1.jpg>
<http://people.rit.edu/andpph/photofile-b/doisneau-1.jpg>

<http://maisonbisson.com/blog/post/10531/focal-plane-shutter-distortion/>