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Legacy Lenses Discuss the use of older lenses, using adapters, from the Olympus OM system, Leica M and R-series, and the millions of others too.

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Old 9th May 2009
Ken Lister Ken Lister is offline
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OM Exposure Compensation

Having just tried my 50mm f1.8 OM lens on my E500, I find a bit of a problem with the exposure. I have to compensate by minus 1/3 stop for each stop decrease in aperture. Starting with -.3 stop at f1.8, I am at -2.3 stops by f16to maintain the same image brightness on the LCD screen on playback.
I used aperture priority and centre weighted metering.

Is this normal and will I have to do it with any other lenses I acquire?
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Old 9th May 2009
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Re: OM Exposure Compensation

My 50mm f1.8 does the same thing. I have read on other forums that this is just the nature of the lens. Seems weird that the more you stop it down the brighter the picture gets. Go figure.
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Old 10th May 2009
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Re: OM Exposure Compensation

I am tempted to say "beware the lcd screen..." because I think it could be misleading in this case.

I sometimes compensate for some of the legacy lenses I have tried, but never by anything like 2 stops!

The acid test is to shoot a range of images using aperture priority and no compensation at all the different f stops, then look at the files on the computer and see if they need compensation :-)

Its quite common for my wide aperture legacy lenses to produce dark images because they let image light into the camera all over the place (compared to the 4/3 sensor) so the meter thinks its a rather bright day.

Just my 2p :-)

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Old 10th May 2009
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Re: OM Exposure Compensation

Quote:
Originally Posted by snaarman View Post
I am tempted to say "beware the lcd screen..." because I think it could be misleading in this case.

I sometimes compensate for some of the legacy lenses I have tried, but never by anything like 2 stops!

The acid test is to shoot a range of images using aperture priority and no compensation at all the different f stops, then look at the files on the computer and see if they need compensation :-)

Its quite common for my wide aperture legacy lenses to produce dark images because they let image light into the camera all over the place (compared to the 4/3 sensor) so the meter thinks its a rather bright day.

Just my 2p :-)

Pete

Tried what you suggested. Same results on my PC. From -0.3 to -2.3 stops compensation still needed.
With spot metering it is worse from -1.0 wide open to +3.0 at f16. Evaluative metering seems to work best with a variation of only one full stop from zero compensation at f1.8 to +1.0 at f16. I'll stick with evaluative metering as it seems more forgiving.
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