Site Sponsors
Results 1 to 3 of 3

Thread: Batis 25 coma test on A7R II

  1. #1
    New Member Pipefish's Avatar
    Join Date
    Dec 2015
    Location
    Manila
    Posts
    6
    Post Thanks / Like

    Batis 25 coma test on A7R II

    I'm now the proud owner of a Batis 25 (one of two people who own one in my country) >:-> and I've managed to do some tests. The lens is a beauty. The LED indicating focus distance and DOF is an eye-catcher, I think it's the first curious thing that people notice. The lens is fat but light. It's razor sharp from corner to corner -- at F2 -- based on preliminary tests I've done.

    The 25 isn't coma free. It exhibits bat wing-like light aberrations especially when wide open, although they improve as you stop down starting at F2.8. The focus distance indicator is cool, although I hoped it was more precise -- the steps become bigger as the distance increases. An option for 0.1 unit increments across would have been nicer.

    Here are some cropped photos to show the coma. I don't have star shots yet, but the city lights should give you an idea. The photos are uncorrected for distortion. Vignetting correction of 34% was applied in Lightroom. The full-size photos (42MP JPGs) are in this album.

    F2:


    F2.8:


    F4:


    F5.6:
    My Flickr
    Thanks 5 Member(s) thanked for this post
    Likes 1 Member(s) liked this post

  2. #2
    New Member
    Join Date
    Sep 2015
    Location
    EU
    Posts
    10
    Post Thanks / Like

    Re: Batis 25 coma test on A7R II

    Hello,

    After few months of searching and testing several copies of Batis 25 at Friday finally I got my own piece .
    (2 copies that I previously tested were weaker in sharpness (to F 2.8 - 3.5) from FE 28/2 which I also owned for several months.)

    In my copy aberration is also present and closing the aperture to 2.8 actually almost solves the problem (so far).

    After two days of shooting it is visible just in a few pictures.
    (last few days weather is not so great in my region and maybe if there will be more sun problem starts to be more visible (for e.g photo with backlight or as shown by Pipefish night photography)).

    The picture below shows the worst case scenario up to this moment.
    Small jpg’s sooc with correctiosns on (Sony & Zeiss should do some upgrade for people doing photos in jpg, these images are not a particularly demanding):

    Sony ILCE-7S
    E 25mm F2
    F2
    1/100
    ISO 100


    Sony ILCE-7S
    E 25mm F2
    F2
    1/160
    ISO 125


    Soon I'll try do some night shots for compare.
    Link to Dropbox with raw & jpg:
    https://www.dropbox.com/sh/8e6szl4ps...pxMEhJ7Ba?dl=0


    From myself I will add that despite this issue I'm more than very happy with my purchase and I finally got a proper wide angle companion to my FE55 and 35 F2 on RX1.

    Regards,
    Michal


    ps. English is not my native language so sorry if I made any mistakes.
    Thanks 4 Member(s) thanked for this post

  3. #3
    New Member
    Join Date
    Sep 2015
    Location
    EU
    Posts
    10
    Post Thanks / Like

    Re: Batis 25 coma test on A7R II

    Update,

    Last night I did a few test shots at apertures from f2 to f8.
    Camera is a A7s and because of different sensors certainly there are differences in image processing.
    Generally, I do not see such problem as on Pipefish samples.

    Maybe images which I put in the link below will be useful to someone.

    https://www.dropbox.com/sh/8s84pnkq1...4SPDIY-ma?dl=0 (480 MB)


    Michal

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •