Canon EF 50mm f/1.8 II UNsharp

Started Sep 10, 2012 | Discussions thread
MM1
MM1
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Re: that is bad
In reply to WalterMundstock, Sep 11, 2012

WalterMundstock wrote:

I understand that this back/front focus thing is basically a problem that may occur where the lens will focus slightly in before (or after) the subject itself, thus causing a focus issue.

This may not be only lens focusing somewhere else. You also might have a body that is miscalibrated and it sends a perfectly fine lens into wrong position.

This happens when the light path to the imager sensor is not harmonized with the light path to the AF sensors (as they are in different places).

So there may be more places where the focusing error may be introduced. You could even "fix" the focusing error by calibrating originally a good lens to the incorrectly focusing camera.

Is this something configurable? Or is this something that require sending the equipment to manufacturer?

Some bodies have this "micro focus adjustment", but this doesn't solve that many situations as when you send the lens/camera to the manufacturer for the service.

And some bodies don't even have it and require sending the equipment to the manufacturer in every case of AF problems.

Thanks.
Walter

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Cheers,
Martin

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