Oly 60mm/2.8 Macro: ISO question

Discussion in 'Native Lenses' started by Starred, Oct 15, 2012.

  1. Starred

    Starred Mu-43 Regular

    134
    Aug 7, 2010
    It seems that whenever I use the Oly 60mm Macro, the ISO increases very fast, at least faster than I am used to with other lenses.
    E.g. when I shot a flower in my livingroom this morning with the 60 on f/2.8 the shuttertime was 125 and ISO 2000. When I did a similar (about similar distance) shot with the Oly 45 on f2.8 the shuttertime was 100 and the ISO 800. When I repeated this with the Oly 14-150 on 60mm and f5.4 the shuttertim was also 125 and ISO was 2000.

    Does this have got something to do with the fact that it is a macro lens?
     
  2. FlyPenFly

    FlyPenFly Mu-43 Veteran

    448
    Feb 15, 2011
    The closer you get to a subject, effective aperture increases even if the camera isn't reporting it.
     
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  3. Yes. As a macro lens approaches it's minimum focusing distance the lens group begins to move further away from the sensor, the same as if you had attached a set of extension tubes to a normal lens. This reduces the light transmission to the sensor, such that an f/2.8 lens like the Oly 60mm will have an effective maximum aperture value of approx f/5.6 at 1:1 magnification.
     
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