Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-12-2021, 06:29 PM   #1
New Member




Join Date: Sep 2021
Posts: 1
Prism desilvering

Hey everyone! So I pulled out my Pentax K1000 the other day for the first time in about ten years. Was hoping to get into shooting a little film again. However I found something that I had recently been reading about being a problem on these Chinese made cameras. The prism had unfortunately started to desilver. Iíve been doing research on this and learned a lot about it and what can be done. But I havenít seen anyone say Whether or not the camera is still usable. When I look through the viewfinder it really doesnít bother me that much. And Iím pretty sure it wonít affect the image. But will it affect the metering at all? Everything else about the camera is still good so if I can tolerate a little ink blot I will until I figure out if I want to do anything about it. Thanks!

09-12-2021, 07:44 PM   #2
Loyal Site Supporter
Loyal Site Supporter
ismaelg's Avatar

Join Date: Apr 2009
Location: Puerto Rico
Photos: Gallery
Posts: 2,135
Hello,

I am not an expert by any means, but, the 2 meter cells take the measurements from behind the pentaprism to each side of the viewfinder. So I would assume that desilvering will have an effect in metering. Now, how much of an impact? That will depend on the severity of the desilvering. You say it doesn't bother you much, so I'm thinking you can still see most of the image. In that case, Other than the inconvenience and possibly some over exposure reading, I don't see any other impact as it will not have any effect on the image taken. I'd try a test roll and see if you need to adjust (most likely underexpose) to compensate. Also keep in mind negative film has a considerable latitude that will tolerate some exposure variations, so it may not even need correction.
There is a 3rd meter cell that will turn the meter on and off. If the desilvering is bad enough that this cell doesn't read then the meter will seem dead. But then, it will also mean you can't see much at all either.
Most importantly, go out and have fun with it!


Thanks,
Ismael
09-13-2021, 05:37 AM   #3
Loyal Site Supporter
Loyal Site Supporter
SharkyCA's Avatar

Join Date: Sep 2017
Location: Carleton Place, Ontario, Canada
Photos: Gallery
Posts: 799
QuoteOriginally posted by K1000Guy Quote
Hey everyone! So I pulled out my Pentax K1000 the other day for the first time in about ten years. Was hoping to get into shooting a little film again. However I found something that I had recently been reading about being a problem on these Chinese made cameras. The prism had unfortunately started to desilver. Iíve been doing research on this and learned a lot about it and what can be done. But I havenít seen anyone say Whether or not the camera is still usable. When I look through the viewfinder it really doesnít bother me that much. And Iím pretty sure it wonít affect the image. But will it affect the metering at all? Everything else about the camera is still good so if I can tolerate a little ink blot I will until I figure out if I want to do anything about it. Thanks!
I don't know if a process like this is even feasible for a prism?
How to Resilver a Mirror | LoveToKnow

Alternate solution, https://youtu.be/1OvzJGSWkao

Last edited by SharkyCA; 09-13-2021 at 05:47 AM.
09-13-2021, 07:06 AM   #4
Pentaxian
tonyzoc's Avatar

Join Date: Jul 2018
Posts: 500
QuoteOriginally posted by K1000Guy Quote
Hey everyone! So I pulled out my Pentax K1000 the other day for the first time in about ten years. Was hoping to get into shooting a little film again. However I found something that I had recently been reading about being a problem on these Chinese made cameras. The prism had unfortunately started to desilver. Iíve been doing research on this and learned a lot about it and what can be done. But I havenít seen anyone say Whether or not the camera is still usable. When I look through the viewfinder it really doesnít bother me that much. And Iím pretty sure it wonít affect the image. But will it affect the metering at all? Everything else about the camera is still good so if I can tolerate a little ink blot I will until I figure out if I want to do anything about it. Thanks!
I'm guessing a spotmatic prism will fit a K1000. You can pick up a parts body for $20 or less and swap prisms.



09-13-2021, 08:52 AM   #5
Site Supporter
Site Supporter




Join Date: Jun 2008
Location: Idaho
Photos: Gallery
Posts: 1,405
QuoteOriginally posted by tonyzoc Quote
I'm guessing a spotmatic prism will fit a K1000. You can pick up a parts body for $20 or less and swap prisms.
Even a used K1000 isn't that expensive to steal a prism from (or just replace your existing camera), assuming you get one which doesn't have the same issue.

PENTAX K1000 35mm SLR Film Camera with 50 mm lens Kit + Extras 27075045002 | eBay

Also see: https://www.pentaxforums.com/forums/8-pentax-film-slr-discussion/318347-k100...questions.html
09-14-2021, 04:05 PM   #6
Site Supporter
Site Supporter
cdd29's Avatar

Join Date: Sep 2016
Location: Southern Indiana
Photos: Gallery
Posts: 345
Never tried this but found this on a quick Giggle search:
The Classic Camera Repair Forum: Silvering prisms
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, prism
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
67 TTL Prism - Needle accurate? Meter working? Lewishart Pentax Medium Format 3 05-15-2021 07:33 AM
Pentax 67ii AE prism Exposure Mode Switch Issue bestcoast Pentax Medium Format 2 04-01-2020 08:21 PM
Prism Desilvering or something else? Helios 1984 Pentax Film SLR Discussion 7 08-18-2016 09:42 AM
Pentax KX prism desilvering! Advice please. Bob TN Pentax Film SLR Discussion 6 06-08-2016 10:52 AM



All times are GMT -7. The time now is 11:00 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top