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05-27-2014, 04:23 AM   #1
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Severe front focus with external flash spotbeam

Hi, I got myself a Sigma EF-500 ST for my K-r. It exposes well with only one annoying flaw. When focusing in the dark, the flash AF assist kicks in and the K-r focuses. However, the focus lock is always way in front of the intended target. The result is consistent at any distance and focal length. The front focus does not happen with the camera's built-in af assist. I'm using the kit lens here.

The funny thing is, on my film camera (SFX), focus is spot on with the external flash AF assist. So I think it's more of a problem with the camera than the flash.

Anyone faced a similar problem?

05-27-2014, 07:12 AM   #2
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The flash assist is a red LED on the EF-500, right? It may be that the AF is wavelength sensitive on your K-r.

05-27-2014, 05:41 PM   #3
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Yes, the led is red. Hmm, so there's nothing I can do about it then. I have the impression that all af assist lamps on external flashes are red?

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