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Sony A7R + LA-EA4 + Minolta Beercan 70-210mm f4

Discussion in 'Adapted Lenses' started by tbyork2014, Jan 19, 2014.

  1. tbyork2014

    tbyork2014 TalkEmount Regular

    84
    Jan 11, 2014
    Hi,
    Thought I would share about images taken with the above combo at 210mm. It is known to have a significant amount of chromatic aberration, and also may not be able to keep up with the A7R's 36MP sensor. Hopefully the images below will shed some light on this. BTW, I have done -10 microAF adjust with this lens as it seems to focus more accurately with this setting. All are shot handheld and center crops, center-point AF on the chimney.

    f4.0:
    12027784945_86e33da586_b_d.

    f5.0:
    12028124484_64cd424623_b_d.

    f5.6:
    12028011053_5199f3d6c3_b_d.

    f8.0:
    12028024423_35c424a2dc_b_d.

    My thoughts were that at f5.0 the sharpness improves significantly, whereas at f4 and 4.5 (not included) were still not sharp and high in chromatic aberration.

    Boon
     
    • Like Like x 3
  2. addieleman

    addieleman Passionate amateur

    Nov 13, 2012
    Netherlands
    Ad Dieleman
    Thanks for sharing. Would love to see some full-size files from these...
     
  3. tbyork2014

    tbyork2014 TalkEmount Regular

    84
    Jan 11, 2014
    As requested.

    These at f4:
    12055383904_552bc103b8_o_d.

    f8:
    [​IMG]

    BTW, I've noticed something strange with my Photoforge 2 app, as the exif shows f16 for the second file, whereas it say f8 on my camera. BTW, the longitudinal chromatic aberration is high at f5, less at f5.6 and significantly less by f8.

    Boon
     
    • Like Like x 1
  4. addieleman

    addieleman Passionate amateur

    Nov 13, 2012
    Netherlands
    Ad Dieleman
    Thanks a lot for sharing. The f/4 one doesn't look very attractive, the f/8 one seems OK apart from slight unsharpness that may be motion blur? Judging from the detail on the roof there may be just a little front-focus. BTW, the FxIF plug-in for Firefox says f/8 for the second and f/4 for the first, same for Faststone Image Viewer, so there's probably a programming error in the Photoforge 2 app.

    Seeing this I'll probably withhold from getting an LA-EA4 and an AF telezoom even though I am getting a little frustrated after years in mirrorless land without a really good stabilized AF telezoom. Will hold my breath for the FE 70-200/4. Thanks again!
     
  5. tbyork2014

    tbyork2014 TalkEmount Regular

    84
    Jan 11, 2014
    Sorry but the blur is more from Flickr compression than the actual OOC jpeg which is much sharper. I don't think you can judge the focus from the detail in the roof tiles, as it has been quite compressed; the focus was on the brickwork of the chimney (centre-point AF). But I do agree that the f4 is a disappointment. Unfortunately all the A-mount lenses I have are screw-drive, as I suspect the SSM lenses will focus better with the LA-EA4.
    Boon
     
  6. addieleman

    addieleman Passionate amateur

    Nov 13, 2012
    Netherlands
    Ad Dieleman
    I see, didn't know that Flickr compresses jpeg files.
     
  7. tbyork2014

    tbyork2014 TalkEmount Regular

    84
    Jan 11, 2014
    Or should I say Photoforge 2 when uploading to Flickr.

    Boon
     
  8. RAWFA

    RAWFA TalkEmount Veteran

    327
    Dec 25, 2011
    For the price the Monolta 70-210mm f4 costs I think the results are perfectly acceptable. I'm very interested in hearing your thoughts regarding the AF speed with the LA-EA4. I've seen some tests with the A58 and the A77 and I was really surprised at how fast it was able to focus.