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Lens comparison to 35 mm slr

Discussion in 'Help and Feedback' started by oxhouser, Nov 27, 2012.

  1. oxhouser

    oxhouser Mu-43 Regular

    Nov 26, 2012
    I have looked but up to now didn't find the info
    Does anybody have a quick look up or cheat sheet showing the equivalent 35mm SLR lens to a micro 4/3 lens?
    I have been using SLR cameras for years and have a feel for what size lens gives what results but as I'm new to 4/3 format I'm a bit unsure, lenses I like to use on SLR are 10mm to 24 mm zoom a 50mm prime and an 18-250 mm zoom
    In particular I'd like to get close to the 10 mm wide and have something like the 50mm prime as that was a very sharp lens and you could really blur the background to make the subject pop.
    Any help much appreciated
  2. dwig

    dwig Mu-43 Top Veteran

    Jun 26, 2010
    Key West FL
    Assuming by "35mm SLR" you mean a "full frame 35mm film SLR" then:

    The general "quick" approximation is that µ43 lenses need to be 1/2 the focal length to give a similar field of view.

    I say "similar" because the µ43 image aspect ratio (shape) is different than that of a full frame 35mm image. The above approximation is based on the diagonal dimensions. If you crop the µ43 images to the aspect ratio of a 35mm FF image the scaling factor changes from 0.5 to something more like 0.45.
  3. OhWellOK

    OhWellOK Mu-43 Veteran

    Oct 4, 2012
    Brooklyn, NY
    Someone with more technical expertise could probably answer this more in depth than I, but in basic terms m4/3 has a 2X crop factor in relation to to 35mm. Thus, a lens with a focal length of 25mm on m4/3 is = 50mm lens on an SLR. Like dwig said above, the aspect ratio is different though 4:3(m4/3) vs 3:2(SLR).
    I believe this comparison refers to 35mm SLR; not sure if the comparison is slightly different with DSLRs using APS-C or FF sensors?
  4. kevinparis

    kevinparis Cantankerous Scotsman Subscribing Member

    Feb 12, 2010
    Gent, Belgium
    basic rule is the micro 4/3 lens is half the focal length of the 35mm equivalent

    so the 25mm f1.4 from panasonic gives a field of view the same as a 50mm on a 35mm camera.

    Depth of field alters a bit too... the 25/1.4 has an approximate equivalent depth of field to a 50mm 2.8 on 35mm

    The panasonic 25/1.4 is a very sharp lens - though a little more expensive compared to equivalent lenses on 35mm

    there is no equivalent of the 10-24 - the nearest being the 7-14 from panasonic

    similar with the 18-250, the nearest being 14-140 from panasonic and the 14-150 from olympus

    full page of all the existing micro 4/3 lenses here

    Four Thirds | Micro Four Thirds | Products(Lenses)

    hope this helps

  5. WT21

    WT21 Super Moderator Subscribing Member

    Feb 19, 2010
    OP seems to have an APS-C camera, given the lenses cited. If it's a Canon ASP-C, then that, too, is a crop camera, at 1.6 vs. full frame. Nikon and Sony crop DSLRs are 1.5 vs. Full frame, and m43 is 2.0 vs. full frame.

    Assuming Nikon or Sony, then, comparing your 18-250 vs. m43 would be 18X1.5/2=13.5mm. Or you can just do 18mm * .75 = 13.5. 250 would therefore be 137.5. Meaning the nearest would be something like a 14-150. Coincidentally, if you are shooting Oly, Oly has a very nice and compact 14-150 for around $300-400 used (not sure the new price) that would approximate your cited 18-250.

    10-24 would need 7.5-18mm, similar to the 7-14 from Panny or the 9-18 from Oly, though the Panny is closer on the wide end, and the Oly is closer on the long end.
  6. D MATIC

    D MATIC Mu-43 Regular

    Jul 18, 2012
    10-24mm zoom sounds like an aps-c lens. Can you confirm which exact lens you are using?
  7. oxhouser

    oxhouser Mu-43 Regular

    Nov 26, 2012
    I'm using a canon 400d now but had an Olympus M20 a good few years back, I have the answers I need from the replies above
    Thanks for the help it's much appreciated
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