Light Seal Placement Guides

Mamiya M645 Mirror Cushions Placement Guide

Mamiya M645 Mirror Cushions Placement Guide

USCamera Light Seals | Kits | Foam Sheets | Leica Film Cameras
Mamiya M645 Mirror Cushions Placement Guide | USCamera Foam
Before doing anything, please read about seal removal and installation.
Also,this M645 mirror kit is always in stock.
Please contact us with any questions you may have. New parts, light seal kits and also downloads are added to our almost every day.

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Tech Note: Most camera body channel seals are installed starting at the hinge end, working towards the latch side until the seal is used up
You are installing an 3 piece kit for the Mamiya M645 series of film cameras.
Please note the mirror cushion is the straight seal. The other 2 seals fit on mirror frame beside the mirror. Those are foam seals and not cushions. They are applied to the mirror frame to prevent light leaks when using the waist level viewfinder. Mamiya found that when the mirror rose to the top and the shutter opened, stray light enter the mirror cage area could fog the film.  That was only occasionally and really depended on how close or far away from the camera user was from the waist level finder when the image was taken. Just FYI, later model M645 cameras were updated and the foam seals on the mirror frame where removed and seals were placed at the top of what Mamiya called the “reflection absorber leatherette” on the left and right sides on the inside of the mirror housing.  In the parts list the “reflection absorber leatherette” parts are SLS29161 and SLS29131. The techs at Mamiya found light leaks were more of common with the updated seals than when the foam seals were applied to the mirror frame. So any M645 camera in for service they added the seals to the mirror frame.

The images below should help you in placing these 3 foam pieces.

Please note it is easier to install the mirror cushion with the viewfinder removed. I can show you how that part is easily removed in a video, I will make available soon.

Mamiya M645 mirror and cushion

Mamiya M645 mirror cushion

Mamiya M645 mirror foam and cushion

Mamiya M645 mirror foam

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About Gray

As a 1979 graduate of National Camera's resident camera repair school, is where I found what I best at and wanted to do for the rest of my working career. After camera repair school, I found my gift was the ability to easily understand complex electro-mechanical photo products. I could take almost any imaging item apart, cameras, lenses, slide/movie projectors plus more, understand how the unit functioned, and repair it. Then, accurately reassemble it into a fully working unit. In 1980, I was employed in Denver as a technician for the largest Colorado camera service center performing repair and service of both in and out of warranty for over 38 brands of photographic equipment, accumulating over 5000 hours of bench time. In 1983, I started Technik Camera as a self-employed contractor and general technician. Within a few years, I employed 4 more technicians, 2 people as support staff, and more. I accumulated another 40,000 hours of bench time as we serviced 110mm, 35mm, medium format film cameras, lenses, flash, enlargers, timers, paper processors, long roll portrait cameras, and more. The challenge of successfully taking anything photographic apart and reassembling it into an accurately working piece... and you could not tell I took it apart, was very satisfying for me. Before 1998, we attended many training seminars hosted by factory trainers from Canon, Fuji, Konica, Mamiya, Minolta, Nikon, Olympus, Pentax, and more. Except for a few products, I have worked on most equipment made and thoroughly enjoyed it. When digital products came to market, I didn’t find the digital service as satisfying as film equipment. So I took the time to develop a website that supported digital/film cameras, lenses, other imaging items with parts and service information. I continued to service my equipment and several customers who maintained large collections. The challenge of successfully taking anything photographic apart and reassembling it into an accurately working piece... and you could not tell I took it apart, was enough for me. I have attended many training seminars hosted by factory trainers from Canon, Fuji, Mamiya, Minolta, Nikon, Olympus, Pentax, and Ricoh. I have special tools and test jigs required for many repairs for Canon, Pentax, Rollei, Rolleiflex, and more. I do not work on studio flash. I don't care much for Alpha, Bronica S2 S2a, some Contaflex, and Kodak leaf shutter reflex mirror cameras plus a few others. I enjoy working on almost everything related to film, though in the last few years my focus is on equipment that will not require parts I don’t have. I am adding to the product service list on the service page. I could not include everything I work on there. Sometimes customers will ask if I can fix their model and I am surprised it wasn’t listed. I was working on photo products long before websites were here and I have not needed to advertise for years. I have plenty of my cameras to maintain as well as many local camera collectors with large collections. So do not hesitate to contact me with a service question about your equipment. I am sure I can take care of any issue you may have with the maintenance or service required with your film cameras, lenses, and more. I was working on photo products long before websites were here and I have not needed to advertise for years. Kindest regards, Gray.

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2 thoughts on “Mamiya M645 Mirror Cushions Placement Guide

  1. Robert says:

    Hi,

    how are the seals and the cushion fixed to the body/mirror frame. Is there already some adhesive on the seals/cushion or is additional adhesive needed?

    Best regards,
    Robert

    1. Gray says:

      Thanks for contacting me. The kits you are asking about are packaged with open cell foam with the adhesive already applied. Peel off the back from the foam to expose the adhesive. When installing these kit parts an adhesive delay is important to help with proper placement. More on adhesive delay in the removal and installation instructions here https://uscamera.com/removing-installing-light-seals/. There is a placement guide for help on the installing mirror cushions and placing the seals on each side of the mirror. Look here https://uscamera.com/mamiya-m645-mirror-cushions-placement-guide/

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