depth of field scale on OM lens question.

johnny9fingers

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Superior, Wisconsin USA
When you use OM lenses on an E-P2, is the depth of field scale accurate? I have been considering getting an OM adapter as I have 28mm, 50mm & 85mm lenses and thought it would be fun to give them a go on the E-P2. The only bad thing would be my OM-1n would feel even more neglected.....
 

johnny9fingers

Mu-43 Veteran
Joined
Jan 10, 2010
Messages
227
Location
Superior, Wisconsin USA
:rolleyes: Duh, I found this post by Amin that answers my question. I need to read through the posts here as a lot of the questions I have are already asked and answered :tongue:

It's very simple. Say you're using the following two cameras:

OM-1 (35mm frame) with OM 100mm f/2.8 lens mounted
E-P1 (4/3 frame) with OM 50/1.4 lens mounted via adapter
Now use those two cameras to take a picture of a given subject at a given distance will have the following effects:

Framing (angle of view) will be the same
Depth of field will be the same if the E-P1 lens f-number is set to half the f-number of the OM-1 lens. Ie, the 100mm lens at f/4 on the OM body will have the same DOF as the 50mm lens at f/2 on the E-P body
Speed (as it relates to exposure) is based on the nominal f-number, and no calculation is needed. Ie, for a given ISO speed, setting the OM lens to f/2.8 and the E-P1 lens to f/2.8 will result in the same exposure for any given shutter speed
Note that all of the above are true whether you use an OM lens via adapter, regular 4/3 lens via adapter, native lens, or medium format lens via adapter. Any 50mm f/1.4 lens used in any fashion on a body will give you the same framing and DOF as a 100mm f/2.8 lens on a 35mm frame (135 format) body, and the speed of the lens is based only on the actual f-number without any calculation factor.
 

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