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07-01-2014, 06:20 PM   #1
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? Re Metz 58-AF2 not registering lenses ...

I'm using a new to me Metz 58 AF2 on my k20d and had a quick question. When I attach my 50 mm FA 1.4 it shows up as an A70mm when using Pttl. I can change it to M50mm on the flash but should that be necessary?
Thanks,
Ken

FYI my 40mm shows up as a 50mm
My 70mm shows up as an 85mm

07-02-2014, 05:16 AM   #2
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Try toggling Zoom Size on your flash.


Hope that helps.
07-02-2014, 08:32 AM   #3
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You're not taking into account the crop factor of your lens. The lens barrel may be at the 50mm position, but the focal length is equivalent to an 80mm on a 35mm or full-frame camera, which would make the flash's decision to be set at 70mm correct.
07-02-2014, 11:24 PM   #4
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QuoteOriginally posted by FrankC Quote
which would make the flash's decision to be set at 70mm correct
But the distance from camera to object does not change with the crop factor.

07-03-2014, 08:57 AM   #5
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QuoteOriginally posted by Schraubstock Quote
But the distance from camera to object does not change with the crop factor.
This is true, but the flash has an internal zoom feature that varies the illuminated area according to lens FOV. That feature is normalized to the 35mm equivalent.


Steve
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