Mamiya 6X8 back on older RB67

rrunnertexas · Sep 16, 2015

Quick question - I have a Mamiya RB67 with a 6X7 wind type film back.

I see there is a 6X8 motorized back, but it is listed for the RB67 Pro SD model.

Will this back fit on a non Pro SD model like mine? If not, is there a certain adapter that is needed?

Thanks for the help,
David

film_man · Sep 16, 2015

Maybe this will help?

http://rb67.helluin.org/2011/02/09/qa-6x8-on-the-rb67/

flavio81 · Sep 16, 2015

rrunnertexas said:
Quick question - I have a Mamiya RB67 with a 6X7 wind type film back.

I see there is a 6X8 motorized back, but it is listed for the RB67 Pro SD model.

Will this back fit on a non Pro SD model like mine? If not, is there a certain adapter that is needed?

Thanks for the help,
David

I know this is not what you would want to hear, but 6x7 is big enough, why go 6x8? You will gain only 0.7cm at the side with this setup (see the link).

rrunnertexas · Sep 16, 2015

film_man - thanks for that link, it is very helpful!

flavio81 - thank you for your insight! That is what I want to hear, your experience and assistance.

Seeing what is involved, it may not be worth all the extra parts that are needed.

Thanks!

MattKing · Sep 16, 2015

flavio81 said:
I know this is not what you would want to hear, but 6x7 is big enough, why go 6x8? You will gain only 0.7cm at the side with this setup (see the link).

6x8 solves the dreaded "where do I put the 10th negative" dilemna.

It works perfectly with the 12x16 paper format which I really like (but have trouble obtaining).

And is an exact scale up from 6x4.5.

EdSawyer · Sep 16, 2015

It's not really 6x8, it's 72 or 74mm wide, I believe. (normal 6x7 is 70mm wide), so you dont' gain much.

Trail Images · Sep 16, 2015

I thought I also read where the 6x8 was only totally effective in Vertical or Portraiture mode and not Horizontal or Landscape mode. Basically stated you only gain the longer side with the back in up & down position and not sideways position......

Neil Grant · Sep 17, 2015

EdSawyer said:
It's not really 6x8, it's 72 or 74mm wide, I believe. (normal 6x7 is 70mm wide), so you dont' gain much.

I have one, it's 56x76mm, normal is 56x68mm - so you do the math! You need the correct revolving adaptor (marked 6x8) - late model Pro S might already have if yo're lucky. Also the baffle plate for the camera body. It's DIY fitting if you can find one - or you may have to 'open up' your's with a file. Getting the spools in is fiddly compared with the manual wind backs.

Mamiya 6X8 back on older RB67

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