What's the deal with the 14mm?

Started Nov 1, 2012 | Discussions thread
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RedDog Steve
Contributing MemberPosts: 969Gear list
Re: What's the deal with the 14mm?
In reply to Anders W, Nov 30, 2012

Anders W wrote:

Following your own idea earlier in this thread, I show three different series. In the first, no attempt has been made to eliminate CA of any kind. In the second, the box labeled "Remove Chromatic Aberration" has been checked so as to eliminate lateral CA. In the third, the Amount slider of the Defringe tool has been brought up from 0 to 10 on the purple side to eliminate any residual fringing.

In my view, two conclusions can be drawn:

1. The filter has little or no effect.

2. Stopping down from f/2.5 to f/5.6 significantly reduces (although does not eliminate) the purple fringe that remains after lateral CA has been eliminated. This in turn suggests that the residual fringe is due to some form of longitudinal CA. Lateral CA is not reduced by stopping down. Longitudinal CA is.

Thanks !


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