Januarys cover

[Dave Roberts]

Just been looking at the cracking shot on the front of the January mag. Question is why is the prop arc at the top less than the other three blades?

[Mark A]

I guess it's the 'rolling shutter' effect as the camera sensor scans the image a line at a time.

If it's scanning left to right the effect would be to compress something moving right to left and stretch something moving left to right.

You got a similar effect on SLR film cameras due to the moving slot of a focal plane shutter.

[carlmeek]

Took this last week. I figured it must be the image sensor scanning top to bottom.

I checked, my propeller definitely isn't bent!!