Fix Old Cameras: Mamiya RB 90mm Slow Speeds Hang
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- čas přidán 6. 04. 2018
- Sluggish slow speeds on a Mamiya RB 6x7 90mm lens shutter. This tutorial video shows how to disassemble the lens to gain access to flush clean the slow speed escapement and restore its functionality.
classic camera repair - www.phototronic.biz
A few tools and books -www.amazon.com/shop/fixoldcam...
Thank you. Based on your video I was able to fix my Sekor C 127mm.
Good to hear of your successful repair.
Sometimes you have to make your own spanner holes to get the job done. Also nice it doesn’t have any bearings to worry about.
Indeed... and it is always a little, shall we say... tense, to take a drill to a lens. The holes in this lens were made with the aid of a small drill press, but it can be done with a hand drill, a sharp bit, and steady nerves. All which you have.
@@FixOldCameras I've never had an RB cover need the drill; I'll get the proper sized Fernco rubber plumbing fitting, those give you more grip area. There's one made that's the perfect size in most hardware stores.
I have had one of these with a stuck shutter for years. I have tried to disassemble it several times. With this ressource I finally think I will succeed! Thanks!
I got it to work! The silver retaining ring for the shutter had got itself loose. So the whole shutter mechanism was hanging. It was nervewrecking to say the least but I managed to get it all back together and reinsert rhe ring properly.
Persistence and patience.
Great video, i manage to clean the mecanism. Thank you very much.
Thanks! Helped me a lot!
Right on!
Thanks. I have a 50mm C with a very stiff floating front element ring. From the looks of it, I should be able to use this video to access the ring the to clean off the old grease and add new grease.
A word of caution - Do not separate the helical threads as the can be very troublesome to restart properly. Try and work the threads without separation.
Thanks. I have one of these that needs to be opened to clean the dust.
Good luck with it. Hope this helps a little.
Wow! One of your most complex videos. Nicely done. Say, this is off topic from this lens repair, but how about showing us how to replace the small built in memory batteries on some later film cameras? The Canon T-70 & T-90 come to mind, I'm not sure about the T-80. Both T-90 & T-70 instructions mention having a Canon Dealer replacing these internal batteries every 5 years. I'd bet any we'd find today need these replaced. As always if you need a sample camera to work on I've got them. Cheers
The T-70 and the T-80 are not to bad to get into. The T-90... well that is a little more difficult to open up and access the memory battery. Thanks for your suggestions and comments and for your continued interest in FOC.
Thanks, I just picked up a "parts" T-70 to play with, the funny thing is every T-70 I own has a good backup battery even after 34 years. If you get a chance have a look at this youtube video it's only about 7 seconds long. (czcams.com/video/Y_fKHnBMssk/video.html) My parts camera has the same issue. The motor hums a if it's jammed and it eventually stops and displays as this video shows. Have you seen this before? I have the service guide for the T-70 but there are no error code troubleshooting hints. THANKS. P.S. I do have two T-90's Two T-80's with all 3 AC lenses, 1/2 dozen T-70's & T-50's all with 35-70mm lenses and 2 of the lowly (Mamiya built ??) T-60's. The T-50's &T-70's are loaner kits for any High School or College kids interested in film photography.
The motor shaft on the T70 is probably slipping or there is a bind in the mechanism that the motor can not over come. And also, it is again good to hear of you loaner program for photography students. Very cool.
Hello! I followed your video and it helped me alot. But I have a different problem where the shutter is cooked it doesn't fire, it just turns loose. And when it eventually does fire the timings count but it doesn't open the shutterblades. It's like the mechanism that operates the shutter doesn't allways work. And sometimes it works and fire fine, the timings work and all. Do you know where I can find the actual trigger for the shutter?
Great video. Could you elaborate on the alcohol flushing technique? You said to flush at an angle so gravity forces alcohol furthest away from the shutter blades, but without a visual it is difficult to know exactly how to do this.
THIS NEEDS TO BE ANSWERED!
Just hold the assembly on a 60 ish degree and flush it like that, the gravity will keep the alcohol from pooling on the lens and shutter
Hey, where'd you get that syringe/applicator with the isopropyl alcohol near the start of the video?
Hola buenas noches ,sabria decirme los nombres ,de las herramientas necesarias,para reparar camaras analogicas ,y la limpieza de sus lentes, desde ya muchas gracias por compartir sus conocimientos!!!
De nada. Y gracias por interes en FOC.
hi there. i have a NB 127mm lens for the rb67. the shutter blades are not completely closed after shutting, leaving a tiny half-moon-shaped hole in between. could this cause any problem with my pictures (such as light leaks) and further problems with the system, or can i neglect it?
The issue will need to be repaired.
Hey Fix Old Cameras, i recently got an Olympus OM-10 and it was not working. Cosmetically it is perfect and the battery chamber is corrosion free, however when i put in new batteries it wouldn’t turn on. I watched your video on repairing the switch and when i took off the cover the contacts were all clean and the little lever that makes it click is still in place. I’m not sure what is wrong with it. What are your thoughts on where to go from here. Thank you!
Does the battery check work?
I always watch your videos just amazed at your knowledge. I have a Nikon F2 when I cock the camera it fires in all the shutter speeds. After a while when I depress the shutter release the mirror stays up and the shutter won't activate until I press the mirror lock up button. Any tips as to what might be happening. Can I send it to you for repair?
Sounds like the mirror release mechanism is sticking or tired. It could also be that the second shutter curtain is not completing its cycle and would possible benefit from a slight increase in shutter tension. Check out some of the FOC videos covering uneven shutter exposure.
Fix Old Cameras thanks for taking the time to respond. Would a cla help?
The shutter tension and mirror lift and release mechanism would be checked and repaired during a service procedure. www.phototronic.biz/services.html
Nice video! May I ask what screw driver type is needed?
Japanese cameras have screws with JIS head. Some mistakenly use a philips screw driver and damage the head.
Nice video! My 50mm rb lens have problems with mirror lock up . I set mirror lock up mode to M on lens. Then trigger shutter relise and mirror goes up but shutter leaf inside lens sometimes does not close and ruins my exposures they are overexposed. Is this lubrication metod will help?
Only if it is happening on the slow speeds and not the speed above 1/30th.
@@FixOldCameras Thank you for the answer.
Dear FOC,
I recently received a Zenit E from family, it seems to be in good condition except for a screeching sound when releasing the shutter. This only occurs when the exposure time is set to anything from 1/60s to 1/500s, at 1/30s and 'by hand' it sounds fine. Do you know what could be the cause of this problem and how to best deal with it?
P.S.
Thank you for all the great videos.
Kind Regards,
Nathan
The Zenit cameras rely on proper (liberal) lubrication for smooth operation. The shutter gears have probably need to be cleaned and lubricated.
Thanks for the reply, will do
Hello Fix Old Cameras!
I'm finding "Repair Video" for Minolta XE
Can you help me? Thanks so much!!
FOC does not have a video featuring the Minolta XE yet. Hope to have some eventually.
Fix Old Cameras thanks so much! I'm waiting! I'm problemb with "shutter", "self timer, ..."