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05-21-2014, 06:35 AM   #1
Pentaxian




Join Date: Sep 2011
Location: Nelson B.C.
Posts: 3,267
Flash and 300mm = iso800

This is an odd one and I'm wondering what is happening. K-3, DA*300 and Metz 50AF, in pttl mode. I tried in av, tv mode, same thing. It will expose properly, but the iso is elevated to 800. I use a flash extender to fill shadows, and one shot today had 1/180, f22 and iso 800. It would have been a better shot at iso 100 and f19.

Why does the iso not go below 800?

05-21-2014, 06:59 AM   #2
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awaldram's Avatar

Join Date: May 2008
Location: Hampshire
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Posts: 720
I would imagine it hardwired on the assumption the longer the focal length the farther your shoooting the greater sensitivity you'll require (to overcome flash power)

I never use auto ISO for flash as the camera has no way of knowing what your trying to reach and therfore cannot deliver a sane expsoure solution using auto ISO.
05-21-2014, 08:25 AM   #3
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Join Date: Mar 2012
Location: Joensuu (Finland)
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But in Av mode, did you try selecting f/5.6 aperture value? what happens then?
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