Limitations of m43 in bright light. OMD and Leica 25mm f1.4

Started Apr 14, 2013 | Discussions thread
CrisPhoto Senior Member • Posts: 1,530
Re: Limitations of m43 in bright light. OMD and Leica 25mm f1.4

Alumna Gorp wrote:

A polarising filter can be good as well if you already have one.

Yes, that's a good idea.

I came to the same conclusion when  I faced the "ISO 200" issue.

My workaround:

  • Attach the polariser filter which gains 1 stop
  • over expose +1EV and use RAW for another stop

Let me explain over expose: The OM-D has about 400% over expose capability. Other cams like my old Minolta have only 200%. So by setting exposure to +1EV I don't lose much but get the aperture down from 2.0 to 1.4.

By the way, the over-exposure capability is the reason why DXO says that (compared to max. sensor saturation) the cam would have about ISO 100.

But this is not how ISO is measured, compared to 50% grey in OM-Ds JPG output the cam has ISO 200 correctly.

Anyhow, by over-exposing (which does not hurt in RAW) and by using the polariser i get the aperture open and therefore I hesitate to buy a ND filter. If I would, I would buy a ND64 or so for long exposures ...

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OM-D + PL25, O45, O75
O9-18, P12-35, O40-150

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