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B4->m4/3 alternatives?

Discussion in 'Adapted Lenses' started by Artorius, May 27, 2013.

  1. Artorius

    Artorius Mu-43 Regular

    Hello there. I recently purchased a Fujinon 7.3mm-102mm f1.9 TV lens and am certain it is in B4 mount. I got it for a steal! $8. However, all B4->m4/3 adaptors seem to be in the rang of $120-$300. So, I was wondering if any of you had less expensive alternatives to these rather pricey adaptors. Thanks for your consideration!
     
  2. kinlau

    kinlau Mu-43 Top Veteran

    836
    Feb 29, 2012
    No, not really. It's such a small production item with low demand, that $120- is pretty well the cheapest I've seen. Make sure you didn't end up with a B3 mount lens instead.
     
  3. ekoe

    ekoe Mu-43 Regular

    73
    Sep 26, 2010
    Hello Artorius,
    That is a 1/2" Bayonet mount, not B4. There is no adapter yet available for it that I am aware of. I adapt these to m4/3 non-permanently by custom fabricating a collar to fit the 1/2" zoom to an existing m4/3 mount. I also adjust the lens for parfocal performance through the zoom at that time.
    I'm attaching a couple photos of a previous 1/2" Bayonet to m4/3 conversion I have done.
     

    Attached Files:

  4. ekoe

    ekoe Mu-43 Regular

    73
    Sep 26, 2010
    I can do a similar conversion for B4 mounts as well.
     
  5. Artorius

    Artorius Mu-43 Regular

    [ame="http://s183.photobucket.com/user/KingofHyrule95/media/Lenses/_1010416.jpg.html"]_1010416.jpg Photo by KingofHyrule95 | Photobucket[/ame]

    [ame="http://s183.photobucket.com/user/KingofHyrule95/media/Lenses/_1010411.jpg.html"]_1010411.jpg Photo by KingofHyrule95 | Photobucket[/ame]

    Here's some pictures of the lens itself. How much would it cost for you to do this conversion? And you're sure its not B4?
     
  6. ekoe

    ekoe Mu-43 Regular

    73
    Sep 26, 2010
    B4 is for 2/3" video. The zoom range of 7.3-102mm is typical of 1/2" video.
    The Fujinon model number (which should be noted on the servo motor, if you have it) should be "S14x7.3B12U". The 'S' and 'B' in that model number indicate a 1/2" Bayonet mount. Please PM me or contact me through my website for additional info.