43 lenses and DoF

Discussion in 'Native Lenses' started by Wigelii, Oct 12, 2013.

  1. Wigelii

    Wigelii New to Mu-43

    Oct 12, 2013
    With the launch of the EM1 decided to return to Olympus (worked with OM-1 and OM-4 years ago).
    I buy the EM1 with the 12-40 F2.8 lens but I also need a tele.
    I consider the 50-200 F2.8-3.5 but I read that you can't get anything out of focus because this s like a F 4-5.6 lens on APS-C or F 5.6-8 lens on Full Frame.
    Is that correct?
  2. MAubrey

    MAubrey Photographer

    Jul 9, 2012
    Bellingham, WA
    Mike Aubrey
    Nope. The 50-200mm f/2.8-3.5 is like f/3.5-4.3 on APS-C and f/5.6-f/7 on FF. But either way, you can still get plenty out of focus simply because of the focal length of the lens. The compression of the lens is what does it.

    The mu-43.com image threads are a little lacking for the 50-200mm, but take a look at pixel-peeper.com:



  3. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    To know what the framing and DOF will be like, you have to multiply both the focal length and the f-number by the crop factor between the two formats of interest.

    -4/3 is a 1.2X crop compared to Canon APS-C, which is a 1.6X crop compared to 35mm full frame.
    -4/3 is a 1.3X crop compared to Nikon/Sony APS-C, which is a 1.5X crop compared to 35mm full frame.
    -4/3 is a 2x crop compared to 35mm full frame

    -To go from 4/3 to Canon APS-C, multiply everything by 1.2.
    -To go from 4/3 to Nikon/Sony APS-C, multiply everything by 1.3.
    -To go from 4/3 to 35mm/full frame, multiply everything by 2.

    So the 50-200 f/2.8-3.5 on 4/3 behaves like a:
    -60-240mm f/3.4-4.2 on Canon APS-C
    -65-260mm f/3.6-4.6 on Nikon/Sony APS-C
    -100-400mm f/5.6-7 on 35mm full frame

    All of the above will give you shallow DOF opportunities on their respective formats. However, if you want even more shallow DOF and can live with medium telephoto, I highly recommend the Olympus 75mm f/1.8 lens.
  4. ckrueger

    ckrueger Mu-43 Veteran

    Jul 16, 2011
    I've done a lot of shooting with a 100-400 (4.5-5.6), and let me tell you, at 400mm-e you'll often be wishing you had more DOF. I've had many great photos be a bit off technically because AF was off by literally an inch.

    I suppose sometimes you may desire an inch of DOF for some shot-for-effect portrait where just the eyes are in focus, but the much more common scenario for me is shooting action or wildlife where I want the entire bird or car in focus, and I'd prefer to shoot at f/11 if I had the light.

    Your style may be different, but in my case extra DOF in telephoto is a safety net that saves photos, not a problem.

    Also, I shot briefly with the 50-200 on an E-3, and one great benefit of that lens is that it can still AF decently, and has decent sharpness with a 2x TC. 800mm-e at f/7.1, with AF in a lens package <3lbs? That's unheard of in larger formats. It was a very nice kit, which I only returned to instead buy a 40D, 300/2.8IS and 2x TC, which is a whole different beast.

    Anyway, I don't have any good examples of the 50-200's DOF, but here's a few examples of 400mm on APS-C, which should be about what you'd get with the 50-200. All of these are f/5.6 except the dog photo, which is f/8:

    • Like Like x 3
  5. ~tc~

    ~tc~ Mu-43 Hall of Famer

    Oct 22, 2010
    Houston, TX
    The exposure advantage of a smaller sensor, due to being able to get the desired DOF with a larger aperture is not to be underestimated. Motion blur is MUCH more commonly an issue than DOF in most photographic instances, and m43 has a big advantage there.
  6. Wigelii

    Wigelii New to Mu-43

    Oct 12, 2013
    Looking at the pictures, I think it will do.
    I must say, the 75 1.8 sounds tempting too (and the pics look great).
    I regularly take pictures in theaters, in low light. So 1.8 would be great but on the other hand, untill now I often used a Pentax 200mm F2.8 (I am in the middle of selling all my Pentax gear and move to Olympus) and I miss the flexibility of a zoom because in theaters it is rather difficult to move around a lot and disturbing if I do.
    So I think a zoom would be better there. I would have liked the 14-150mm that Olympus anounced but it will be available only by the end of 2014 (I think).
  7. LowTEC

    LowTEC Mu-43 Regular

    You may also take a look at the Lumix 35-100 2.8.
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