What's going on here?

Oggy

Oggy

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Roger
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sBach-1.jpg


When I first saw this picture I got what was happening wrong. Look at the sharpness of the fuselage then the wings.
 
Not sure what's going on here from what I can see I'm thinking a shot with a very shallow DOF that is focused on the fuselage?

Or is there something I'm missing?
 
It's parallax shift two points moving round a central orbit have to move at different speeds to stay in a constant relation to one another .

Physics 101 :-)
 
zilly said:
It's parallax shift two points moving round a central orbit have to move at different speeds to stay in a constant relation to one another .

Physics 101 :-)
Click to expand...

^^^ Yes. It's a common effect with panning. Another contributer here may be that the shutter is travelling top to bottom, but that's kind of BTW.

The pivot effect is most common if you pan a car at close range with a wider lens and a relatively slow shutter speed - both ends blurred and sharp in the middle. It can look quite good.
 
When I first saw the picture I was thinking photography not aircraft. My first thought was DOF then it struck me that I was about 1000-1500 ft from the aircraft and there was no way I could have got a DOF of a few feet. The picture was actually taken at F8.

As Joe mentioned the smoke is a clue. The real evidence is the ailerons (the hinged portions at the back of the wings which move in opposition to each other to give the aircraft roll control). The right one is deflected down and left one up. This particular aircraft is one of the most agile in the sky, and with those deflections it is rolling very rapidly to the left. The effect is not quite parallax, but not dissimilar. Basically any part of the aircraft close to the axis of roll only moves a small amount, and anything further away moves more in a fixed time period and so appears more blurred.

I am amazed though at how pronounced the effect is.
 
So, without all the big words, are we basically talking about motion blur here?

It's late in the evening and I'm confused. But I think I get it..
 
Urban Grimshaw said:
So, without all the big words, are we basically talking about motion blur here?

It's late in the evening and I'm confused. But I think I get it..
Click to expand...

Yes, but as some parts of the aircraft are moving further than others they are more blurred. :thumbs:
 
Yeah, it's quite interesting. Bit of a mind bender to think about it. The motion blur makes perfect logicalal sense (once it's been pointed out :) ), but the relativity of movement is a strain on the brain.
 
It's the same as a turning wheel. The outer edges are travelling faster than the more central parts as they have further to travel for one revolution.
 
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