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Old March 27th, 2010, 04:37 PM   #1
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Ikegami B3 mount, changing to Sony B4 mount.

What I have wondered for some time, seeing as 2/3th inch Ikegami B3 mount lenses go for a lot cheaper than the equal B4 mount lenses, is if it is possible to convert a B3 lens to B4 mounting?

I have searched low and high across the web but I can't find an answer. Terms used were "B3 to B4 mount" "Ikegami camera mount to Sony camera mount" "Ikegami bayonet mount to Sony bayonet mount" etc etc.
I did find Canon conversion kits on ebay for the box/studio/sport lenses not not for handheld EFP/ENG lenses.

The difference in price between the various lenses might be enough to justify a modification, if it is possible.
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Old April 12th, 2010, 01:05 PM   #2
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Anyone got a clue? May have a lead on a nicely priced J8ax6B3.. My AJ-D800 aches for a nice lens :)
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Old April 20th, 2010, 04:09 PM   #3
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I seem to recall from years ago that there are B3 to B4 adapters that work fine as long as you lens has a user friendly back-focus adjustment.
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Old April 20th, 2010, 06:01 PM   #4
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Check with Les Bosher, he makes adapters for many mounts.

Les Bosher - Camera Engineer

An alternative may be to get the B3 mount changed to a B4. Although, I believe the lens to camera connectors may also different, I seem to recall adapter leads being available.
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Old April 21st, 2010, 11:21 AM   #5
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Thanks for the answers.. Got an old B4 mount lens (well.. half of it.. the rear half :)) so if I find an Ikegami lens I can see about converting it.
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Old November 11th, 2010, 02:12 PM   #6
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Successful B3-B4 conversion, anyone?

Hi.
Sander, did you succeded in converting the B3 lens to B4?

Brian, can you remember about the B3-B4 pin-out connector compatibility?
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Old November 11th, 2010, 02:21 PM   #7
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The connectors were different, so you'd to check that one out and get it changed.
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Old November 11th, 2010, 05:24 PM   #8
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Never did find a B3 mount lens for the price I wanted. I did find some but the sellers were asking too much. Then I had the chance to buy a cheap B4 lens(Canon J14ax8.5) so I went that direction.
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Old November 11th, 2010, 05:50 PM   #9
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Thank you guys, for your answers.
I'm going to try experimenting myself.
I'll keep you posted if I get something to work.
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Old March 19th, 2011, 05:57 PM   #10
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Re: Ikegami B3 mount, changing to Sony B4 mount.

An old thread but I thought I would add something. I used to have an Ikegami B3 mount J8 which I mounted on a B4 camera, It required 2 adapters. An electrical adapter which was reasonably straightforward but included generating a split rail supply for the lens and adapting the push on push off switch to a momentary. The mechanical adapter included some optics to compensate for the B3 optical relay unit in the lens.

At the time the adapter was about 1000 new, though I doubt if anyone still makes them so you would be looking for something used.
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