Mamiya C330 Pro F: Focus Screen Foam and Light Seals
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
This Mamiya C330 Pro F came into the shop with a focus complaint. In many of these cases, the issue is with the foam on the focus screen becoming deteriorated. And, that was the problem here. The second photo shows what the foam looks like after removing the focus screen from the camera. Without the springy foam, the focus screen will not be in the correct position. Most light seal kits that you buy do not include this part.
If the foam on the focus screen is bad then all the other spots will also need replacement. Photo three shows a critical piece of foam being scraped off the film door near the door hinge. This is the bit that will cause light leaks if not replaced.
It was time for a clean up of all my light seal removal tools (medical tools that have been repurposed) so they posed for a photo in number five.
The final photo is off a test that is done with all C lenses to check if the focus on the viewing lens is the same as the taking lens. Usually all is OK unless the shutter/lenses have been removed and shims not properly put back in place.
