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eric_.

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    Info on R lenses

    in Leica and Rangefinders

    Posted

    Hello all,<br><br>

     

    I am offered a Leica R kit consisting of a R3 with motor and three

    lenses. I have no knowledge of R equipment so I'd like to have your

    opinion.<br>

    The lenses have the following serials:<br>

    - 28/2.8 24419xx<br>

    - 50/2 33383xx<br>

    - 80/1.4 32023xx<br>

    - R3 14936xx<br>

    I'd like to know the version of the lenses and the approximate date

    of production (Germany?). Are these lenses compatible with all R

    bodies? Suppose all equipment is in excellent condition, what would

    be a fair price?<br>

    Thanks alot!

    Thoughts/discussion on a Digital M mount camera.

    in Leica and Rangefinders

    Posted

    I don't think your assessment about DOF is correct. DOF is a function of focal length, focus distance, and aperture setting. The 1.5 crop factor is not actually increasing your focal length of your lens.

     

    Let's look at an example. Suppose you have two prints of the same slide. The first is an 8x12. The second is a 16x24. Both are full frame prints. Since they are both from the same slide, they both have the same DOF. Now what the 1.6 digital crop factor is actually doing is similar to cutting an 8x12 section out of the middle of the 16x24 print. You now have 2 8x12 prints. However, the "cropped" print looks like it was taken with a longer lens. It wasn't though. Also, the DOF is also the same in both prints.

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