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Optimal aperture for Olympus 45mm f1.8 and Panasonic 20mm f1.7

Discussion in 'Native Lenses' started by Max, May 18, 2014.

  1. Max

    Max New to Mu-43

    2
    May 18, 2014
    Hello,

    In normal daylight condition what is the optimal aperture for these lenses that provide an optimal image quality / sharpness?

    Thanks
     
    • Like Like x 1
  2. Vivalo

    Vivalo Olympus Loser

    931
    Nov 16, 2010
    Finland
    In general it is f4 or f5.6 with m4/3 lenses. My own subjective experience with both of those lenses is that f5.6 is the sharpest aperture but f4 won't be any softer in practice.
     
  3. Matero

    Matero Mu-43 Veteran

    455
    Jun 22, 2013
    Finland
    I only got 45mm and have normally been shooting with 2.2 or 2.8. Now yesterday used 4.0 almost for all shots and those show up remarkably sharper than 2.2.


    Sent from my iPhone using Mu-43 mobile app
     
  4. GFFPhoto

    GFFPhoto Mu-43 All-Pro

    Feb 24, 2013
    The 20 is best at 4.0, or at 2.0 depending on who you ask (although lenstip shows 2.0 to be almost as good as 4.0)

    http://www.lenstip.com/269.4-Lens_review-Panasonic_G_20_mm_f_1.7_ASPH._Image_resolution.html
    http://slrgear.com/reviews/showproduct.php/product/1295/cat/68

    The 45 is best at 2.8 in the center, the corners are best at 4.0 (although lenstip shows a slight decrease in the center from 2.8 to 4.0)
    http://www.lenstip.com/316.4-Lens_review-Olympus_M.Zuiko_Digital_45_mm_f_1.8_Image_resolution.html
    http://slrgear.com/reviews/showproduct.php/product/1443/cat/14

    I doubt you would notice any difference shooting either lens between 2.8 and 4.0
     
  5. Vivalo

    Vivalo Olympus Loser

    931
    Nov 16, 2010
    Finland
    Yeah, f4 might be the sweetspot. In practice f5.6 will give more DOF and that way more of the image will be sharper. Depends what you are trying to capture.
     
  6. EarthQuake

    EarthQuake Mu-43 Top Veteran

    831
    Sep 30, 2013
    F2.8-5.6 generally, in my experience for those two lenses. Though both are quite sharp at F2, so it really depends on how much DOF you need.
     
  7. Max

    Max New to Mu-43

    2
    May 18, 2014
    Thank you for these good advices. I've actually done some tests yesterday with a tripod taking a picture of a small text and noticed that around 3 or 4 the text was sharper.

    Sent from my SGH-I337M using Mu-43 mobile app
     
  8. LowriderS10

    LowriderS10 Monkey with a camera.

    May 19, 2013
    Canada
    I shoot most of my M4/3 lenses at f4 (or as close as possible)...seems to be the spot where they sharpen up as much as they ever will, without diffraction rearing its ugly head.
     
  9. GFFPhoto

    GFFPhoto Mu-43 All-Pro

    Feb 24, 2013
    I think we don't get diffraction until around f8, but you are correct that in general they start to soften after around f4