220 in RB67 120 backs?

Murray@uptowngallery · Mar 25, 2008

I think I had this conversation before with someone but can't remember the answer.

People usually warn about pressure plate differences, but I believe someone (Paul Ron?) told me 220 will run fine in a 120 RB67 back.

I have read instructions on how to 'trick' a Kiev 88 back into resetting it's count for the 'second time around'.

Can someone tell me if there is a way to 'fool' the RB67 120 back's counter into resetting half way through a 220 roll?

The only print film I have is 220 right now. The only chrome film I have is 120 & I want to shoot print right now.

Thanks

Murray

David Grenet · Mar 25, 2008

I know you can do it the other way (120 in a 220 back) but I'm not sure how to 'trick' the film counter into resetting.

You could always just count after exposure 10 - 1 wind is 1 frame...

Murray@uptowngallery · Mar 26, 2008

That's the idea, but I hear the 120 back locks at it's expected count. Rumored to, anyway...

thanks

epatsellis · Mar 26, 2008

it does, the frame counting part of the back only has 10 notches for the pawl. the 220 has 20.

erie

Murray@uptowngallery · Mar 26, 2008

So I guess you gotta pull it off the body, open the back in a changing bag to reset.

Bah, automation...

David Grenet · Mar 26, 2008

Sorry, I forgot about the interlocks! Is it a S or SD back/body? I don't think the original backs/bodies had any of these interlocks? If you have a roll of 120 paper handy you could always load that up and see if it lets you after frame 10. My RB67 is put away at the moment but if you like I'll dig it out and have a go.

I've just been playing with a roll of paper in a back and the strokes do get slightly shorter as you get towards the end of the roll, so getting correct frame spacing (and the full 20 shots) could be interesting...

max_ebb · Mar 28, 2008

If it's a Pro S or Pro SD with interlock, all you'd have to do is set the back to multi exposure mode after the 10th frame, and that bypasses the interlock.

As David pointed out, the frame spacing would probably get really wide toward then end, so there's a good chance that you'd only get 19 frames instead of 20.

Photo Engineer · Mar 28, 2008

Max, IIRC it does not advance the film if it is multi exposure mode therefore your method won't work (I think). I sold mine, because I got an RZ and I've forgotten.

PE

max_ebb · Mar 30, 2008

Photo Engineer said:
Max, IIRC it does not advance the film if it is multi exposure mode therefore your method won't work (I think).

You're thinking RZ, not RB. Remember that with an RB, you advance the film with the winding lever on the film back. With a Pro S or Pro SD, if you set the film back to multi exposure mode, the shutter will fire regardless of the state of the film in the back, but you can still advance the film with the advance lever on the film back.

I also use an RZ, but I buy and sell (and therefore test) a lot of RB gear.

Photo Engineer · Mar 30, 2008

Right. Thanks for the memory refresh. You forget these things. Especially at my age.

PE

220 in RB67 120 backs?

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