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I think i need new adapter for A7?

Discussion in 'Sony Alpha E-Mount Cameras' started by hknymz, Jan 15, 2014.

  1. hknymz

    hknymz TalkEmount Regular

    27
    Mar 3, 2013
    Hi,
    Photos taken by SMC Pentax K 200 mm f/4 , some darkness have on corners . Is it adapter issue ?

    [​IMG]
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  2. serhan

    serhan TalkEmount All-Pro

    Aug 27, 2011
    NYC
    It might be adapter or the lens. It is hard to tell. Most of the lenses esp on full frame vignette. Usually you need to stop down to reduce it.
     
  3. Armanius

    Armanius TalkEmount Regular

    188
    Aug 8, 2011
    Houston Texas USA
    How does the lens perform on a Pentax body?
     
  4. serhan

    serhan TalkEmount All-Pro

    Aug 27, 2011
    NYC
    I was searching for reviews, but all Pentax dslrs are apsc sized, no ff... Sb using on film might help...

     
  5. hknymz

    hknymz TalkEmount Regular

    27
    Mar 3, 2013
    I dont use this lens on any pentax body.

    Sent from my GT-N7000 using TalkEmount mobile app
     
  6. Armanius

    Armanius TalkEmount Regular

    188
    Aug 8, 2011
    Houston Texas USA
    Do you have this issue with any other Pentax lenses? Is it a fairly cheap adapter? I don't know much about camera engineering, but as a guess, I don't think adapters would cause vignetting. Crappy adapters might cause focus issues due to faulty flange distance.
     
  7. dbmiller

    dbmiller TalkEmount Top Veteran

    777
    Mar 2, 2012
    New England
    An adapter would cause vignetting if the "throat" wasn't wide enough. Since the NEX cameras are all APS-C, it is quite possible an adapter was not designed with full-frame in mind.

    I have heard that the Hawk's helicoid adapter for M-mount needs to be version 3 to work correctly on full frame. I believe it - I have an older version and I know the barrel of the helicoid was smaller than the opening of an LTM or M-mount, but was more than large enough to let lenses cover the APS-C NEX sensor.

    Vignetting can also come from a filter. If you had a filter on the lens, try taking some shots with the filter removed and see if that changes anything.
     
  8. Armanius

    Armanius TalkEmount Regular

    188
    Aug 8, 2011
    Houston Texas USA
    I'm using a Kippon adapter for Nikon to NEX, and I haven't run into any vignetting issue that the native lens itself doesn't already have.
     
  9. lowincash

    lowincash TalkEmount Regular

    131
    Dec 21, 2011
    Los Angeles
    Kin
    Maybe it's the adapter, should 200mm on FF have any issue with vignetting?

    BTW I like the look with the vignetting on the bird shot :D
     
  10. Nate_Dogg

    Nate_Dogg TalkEmount Regular

    88
    Feb 6, 2013
    Eugene, OR
    Nate Pfeifer
    Does the vignetting lessen when you stop down? If it does, I'm assuming it's the lens, if not, it's probably the adapter.
     
  11. MAubrey

    MAubrey TalkEmount Top Veteran

    ^This.
     
  12. hknymz

    hknymz TalkEmount Regular

    27
    Mar 3, 2013
    i will try tomorrow all suggestion :)