X-E1 aperture priority and auto iso mode issue

Discussion in 'Coffee with Rico Pfirstinger, Fuji X-Pert' started by sga, Mar 23, 2014.

  1. sga

    sga New to FujiXspot

    Mar 22, 2014
    Background to my question:
    I'm interested in landscape photography and have recorded a photo of a typical county scene on a clear, sunny day.
    Lens is the 18 - 55mm XF set at 18mm and with the OIS on and aperture priority mode with f/11 set.
    With the ISO fixed at 200 (i.e non-auto) the exposure (multi mode) was 1/105 sec and iso 200
    With ISO AUTO (MSS 1/60sec, max ISO 6400, Base iso 200) exposure was 1/400sec, iso 800.

    My puzzle - why does the auto ISO favour such a higher than needed ISO value? It seems to have a definite tendency for high iso values instead of more desirable values closer if not equal to the base level.

  2. Ray Sachs

    Ray Sachs FujiXspot Veteran

    Feb 1, 2013
    Near Philadephila
    You probably have DR set to 400%. That'll push the ISO and compensate in processing (for jpegs at least) and 800 becomes it's minimum when you leave ISO up to the camera. Try DR set to 100% and then play with whatever tradeoffs you perceive between higher DR and ISO.

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  3. sga

    sga New to FujiXspot

    Mar 22, 2014
    Spot on thanks Ray. Have just tried your suggestion and now I understand.

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