Just got a couple CCTV lenses: a Computar and Canon

Discussion in 'Adapted Lenses' started by ronbot, Jul 27, 2010.

  1. ronbot

    ronbot Mu-43 Regular

    98
    Apr 27, 2010
    Finally got some CCTV lenses and adapter; a Computar 12.5mm F1.3 and Canon 12.5-75mm F1.8. Here they are with the Panny 20mm for reference:
    [​IMG]
    [​IMG]

    Here are sample shots to show the vignetting of both lenses using a 16x9 aspect ratio.
    First, the Computar:
    [​IMG]

    Next, the Canon 12.5mm:
    [​IMG]

    Finally, the Canon at 75mm:
    [​IMG]

    More sample pictures from the CCTV lenses at different aspect ration here.

    The Computar had to be modified to be able to screw all the way into the adapter.

    The Canon hasn't been modified, but it seems like it needs a quicky with Mr. Dremel to be able to focus to infinity at the wide end. Then again, maybe it is just the way it is as there is no focusing issue past the wide end and towards the tele end.

    Despite the vignetting on both lenses, I'm having fun experimenting with them. At $25 each, can't really complain. Actually, the Computar is currently my widest and brightest lens, so I'm happy with it.
     
  2. Krang

    Krang Mu-43 Veteran

    202
    Feb 19, 2010
    That's pretty decent for a 12.5mm c-mount. Still a bit too much vignetting for me though…

    I assume that the sample images are all aperture wide open?
     
  3. JoepLX3

    JoepLX3 Mu-43 Top Veteran

    509
    Jun 13, 2010
    Japan
    Nice shots and good question.
    - How about comparison shot of widest vs most narrow aperture at both 12.5 & 75 mm?
     
  4. ronbot

    ronbot Mu-43 Regular

    98
    Apr 27, 2010
    Totally forgot to mention it, but all shots were taken at F2.8 actually.

    I'll post additional pictures when I can.