What is supposed to hold the "ring" at end of M42 Pentax lens?

ohaya · 02-13-2016, 04:37 PM

Hi,

I noticed that there's a cup-shaped ring that is supposed to cover the screwmount end of one of the M42 screwmount Pentax lenses, and it is loose. Here's a picture of it, removed from the lens (actually it fell out):

Can anyone tell me how that cup/ring is supposed to be held in place, and also how can I re-secure it? I'm not using the lens for now, as I'm kind of worried that the cup/ring will slide out while the lens is in the camera, and damage the mirror or something else.

Thanks,
Jim

ohaya · 02-13-2016, 05:03 PM

Originally posted by dcshooter

Contact cement. Don't cap the lens or attach it to your camera until it has dried and out gassed for a while.

I don't have any contact cement here, but I do have some gel superglue. Would that work, or does it have to be contact cement?

Thanks,
Jim

---------- Post added 02-13-16 at 05:36 PM ----------

According to this:

No super glue: Canon SLR Lens Talk Forum: Digital Photography Review

Superglue is not good. That post also mentions using JB Weld, which I do have. Would that work?

ohaya · 02-13-2016, 06:14 PM

Ahh! I understand. I guess I can wait to pick up some contact cement tomorrow then. Will ANY contact cement be ok? Or (hopefully not) must it be some specific type?

02-13-2016, 04:37 PM	#1
ohaya Senior Member Join Date: Jan 2016 Posts: 242	What is supposed to hold the "ring" at end of M42 Pentax lens? Hi, I noticed that there's a cup-shaped ring that is supposed to cover the screwmount end of one of the M42 screwmount Pentax lenses, and it is loose. Here's a picture of it, removed from the lens (actually it fell out): Can anyone tell me how that cup/ring is supposed to be held in place, and also how can I re-secure it? I'm not using the lens for now, as I'm kind of worried that the cup/ring will slide out while the lens is in the camera, and damage the mirror or something else. Thanks, Jim

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02-13-2016, 05:03 PM	#2
ohaya Senior Member Join Date: Jan 2016 Posts: 242 Original Poster	Originally posted by dcshooter Contact cement. Don't cap the lens or attach it to your camera until it has dried and out gassed for a while. I don't have any contact cement here, but I do have some gel superglue. Would that work, or does it have to be contact cement? Thanks, Jim ---------- Post added 02-13-16 at 05:36 PM ---------- According to this: No super glue: Canon SLR Lens Talk Forum: Digital Photography Review Superglue is not good. That post also mentions using JB Weld, which I do have. Would that work?

02-13-2016, 06:14 PM	#3
ohaya Senior Member Join Date: Jan 2016 Posts: 242 Original Poster	Ahh! I understand. I guess I can wait to pick up some contact cement tomorrow then. Will ANY contact cement be ok? Or (hopefully not) must it be some specific type?