The MF-6 is a really nice companion to the MD-4. It communicates to the motor drive and allows the motor drive to leave the film leader out of the canister at the end of a power rewind - a feature that I value highly!
Do you have the MD-4?
I have both backs and rarely use the plain one - my F3HP is pretty much full-time attached to the MD-4.
Have you looked on eBay?
There have to be people with the plain back, who use an MD4 and would prefer an MF6 - try some 'want to trade' ads. Or buy an MD4 to go with your back.
Contact Nikon?
Nikon stopped making the F3 22 years ago. The only film camera they still service is the F6.
I realize that, but they should be able to at least provide a part number. If I come across one in my online travels, I'll post it. Also, OP might look for a cheap parts/as is option for a donor.
The MF-14 Data Back (2-MS76) is designed specifically for the F3 and F3HP cameras and can be used with MD-4 motor drive attached. Data back imprints the year, month, day or frame number. Information can be imprinted between the frames leaving the image unaffected. Number imprinting range from -2 to 2000; the year programmed to the year 2100; and daily alarm. Manual ISO film speed setting range: 25-400. The back displays a low battery warning and requires two SR44 batteries.
Didnt find much else at this time...choice seems to be the MF-6B for use with the MD-4 or the databack. There seems to be plenty of both on the Bay right now. Might also put an ad in classifieds for a WTB (want to buy). Also check Nikonians forum to see if anyone has a source for parts.
The MF-14 Data Back (2-MS76) is designed specifically for the F3 and F3HP cameras and can be used with MD-4 motor drive attached. Data back imprints the year, month, day or frame number. Information can be imprinted between the frames leaving the image unaffected. Number imprinting range from -2 to 2000; the year programmed to the year 2100; and daily alarm. Manual ISO film speed setting range: 25-400. The back displays a low battery warning and requires two SR44 batteries.
Thanks for trying to help Steve. The first post with the link didn't work but I found a MF-14 for about $35, not on eBay but on this NOVA shopping site . Hopefully it gets to me soon. I did email Roberts Camera (their used gear site) and they were kind enough to email me back. They don't parts per se but do sell "parts cameras." They had 2 F3s in that category but both were missing their backs. Must be a market out there for plain F3 backs.
Looking at the pressure plates of MF-14 and MF-18, it appears that MF-14 indeed cannot imprint the data between the frames, while MF-18 imprints exactly between the frames.I'm not 100% sure of the MF-14 being able to imprint in-between the frames. I didn't pursue an MF-14 back primarily because of that reason, instead, I managed to get the MF-18 data back which does have the capacity to imprint data in-between the frames.
Looking at the pressure plates of MF-14 and MF-18, it appears that MF-14 indeed cannot imprint the data between the frames, while MF-18 imprints exactly between the frames.
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