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  • Mamiya RB Film Back Insert Seal Kit

Mamiya RB Pro Pro S Film Back Insert Seal Kit

USCamera custom 6 piece light seal kit for the Mamiya RB 67 Pro / Pro S 120 / 220 / 645 Film Back inserts. The insert kit includes door channel seals on the back of top and bottom covers, top / bottom seals left guide roller plate and top / bottom seals right guide roller plate

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Mamiya RB Pro Pro S Film Back Insert Seal Kit

USCamera Custom Light Seals
Mamiya Sekor / Mamiya Film Cameras

Please read this before installing light seal kits here.
Our kits start the finest imported open cell foam we could find.
USCamera makes other popular film camera light seal kits go here

Digital cameras will never look like these vintage film cameras though the first digital compacts were…

The most important and time consuming work is removing the old seals. Focus on clean, clean, clean. Clean the old residue from the door channels, mirror cushion area, door hinge area and anywhere else you are replacing the seals. The finest adhesive in the world will not adhere to that sticky, gooey residue that was once a quality light seal. Proper installation will give you thousands of light tight exposures.

USCamera Light Seal Installation and Placement Help – Mamiya RB Pro / Pro S 120 220 645 Film Back Insert

Before you do anything, please read general instructions on installing light seals here.

Next, take all of the seals out of the kit and lay them out on your work area. This kit includes,

2 x 1mm – top / bottom cover door channel seals
2 x 2mm short – top / bottom mech plate seal, left
2 x 2mm long – top / bottom mech plate seal right

Tech Note. It is much easier to install the light seals on the inserts top and bottom covers if the covers are removed from the insert.  Also note the double exposure lever by the wind lever on the PRO-S film backs only. If you move the DE lever and see the red dot exposed, you will notice the DE blocking lever (see pic) moves to cover and uncover an opening in the top cover. The bottom cover is straight forward, 2 screws on the top cover and 2 screws on the lower mech plate near the spool guides.  To remove the top cover remove the 4 cover retaining screws, 2 on the top cover and 2 from the upper mech plate near the spool guides. Remove the leatherette cover on the wind lever cap to expose the slotted retaining screw.  Note. The small Phillips screws exposed when you removed the leatherette cover do not need to be removed. After removing the slotted wind lever retaining screw carefully remove the wind lever. Now, carefully push the DE blocking lever into the retracted position with your tweezers points and lift the top cover up, left and off towards the right side to allow the DE blocking lever to clear the top cover.

Door channel seals, back cover. Install these seals first. starting left, at the hinge side and working towards the right.

Hinge seal, back cover. Install this seal after the door channel seals.  Install this seal starting at the top, center it between the top and bottom edge of the door channels. This seal is placed over the top of the channel seals you first installed.

Mech plate seals, left / right. Install these seals per the image below.


Mamiya RB Pro Pro S Film Back Insert Seal Kit

Additional information

Weight 1 oz


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