Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-23-2020, 09:29 PM   #1
New Member




Join Date: Sep 2020
Posts: 4
removing focusing screen in pentax 67

I know removing focusing screen in the 67/6x6 was discussed on the internet but I have not found anything on how to actually remove the silver pentaprism guides. Is there a special tool for this?

Attached Images
 
09-24-2020, 07:29 AM   #2
Site Supporter
Site Supporter
gofour3's Avatar

Join Date: Oct 2008
Location: Vancouver, Canada
Posts: 6,906
Welcome to the forum!.

The 6x7/67 focus screens are changeable, but as the manual indicates it was to be done by a Pentax service rep. So yes there many be a special tool involved. Also if misaligned when changing them, will result in focusing issues.

Eric can do this for you, Eric's website:

Pentax Repairs

Phil.
09-24-2020, 07:43 AM   #3
New Member




Join Date: Sep 2020
Posts: 4
Original Poster
thank you

I was trying to see if I could tweak it instead of sending it to him.
09-24-2020, 08:05 AM   #4
Site Supporter
Site Supporter




Join Date: Jun 2010
Location: Central Coast, CA
Posts: 787
Yes there is a special tool. More than that you can't just pop in a replacement. When you re-assemble the focusing screen you have to be able to align everything so the focus is correct across the whole screen. Don't touch any of the internal screws holding the screen in place unless you know what you are doing. Just turning a screw can lead to great sadness.

09-24-2020, 10:44 AM   #5
Moderator
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 7,472
The slots on the sides of the pins suggest a lens spanner type tool would work. However as cautioned above moving these pins may change the plane alignment of the screen and or prism. Probably special equipment would be needed such as an optical bench to properly realign the screen.
09-24-2020, 07:43 PM   #6
New Member




Join Date: Sep 2020
Posts: 4
Original Poster
QuoteOriginally posted by pentaxus Quote
Yes there is a special tool. More than that you can't just pop in a replacement. When you re-assemble the focusing screen you have to be able to align everything so the focus is correct across the whole screen. Don't touch any of the internal screws holding the screen in place unless you know what you are doing. Just turning a screw can lead to great sadness.
Ok I see. Sounds a bit difficult. Although people on this forum in the past claim that they were able to do it. In any case I am not planning to go to far here. Will probably just take a look if I can remove the cover.

---------- Post added 09-24-20 at 07:59 PM ----------

QuoteOriginally posted by Not a Number Quote
The slots on the sides of the pins suggest a lens spanner type tool would work. However as cautioned above moving these pins may change the plane alignment of the screen and or prism. Probably special equipment would be needed such as an optical bench to properly realign the screen.
If I'm not mistaken the silver pins do not change the position of focusing screen. They just hold the metal plate on top of the screen in place and serve as guides for the prism. There are three additional screws underneath that control position of the screen.
09-25-2020, 03:10 PM   #7
Pentaxian




Join Date: Jul 2009
Location: Seattle
Posts: 9,006
You can optionally use a pliers with tape around those special screws (to not gouge them) you have indicated in the picture to remove them. And I would exercise caution removing them. There are small, thin brass shims under them that control the fit of the prisim/folding hoods. Once that and the shroud is removed, the focus screen can be accessed. Note the focus screen is spring loaded to press up in to its place. There is no adjustment to be made.
09-25-2020, 07:48 PM   #8
New Member




Join Date: Sep 2020
Posts: 4
Original Poster
QuoteOriginally posted by tuco Quote
You can optionally use a pliers with tape around those special screws (to not gouge them) you have indicated in the picture to remove them. And I would exercise caution removing them. There are small, thin brass shims under them that control the fit of the prisim/folding hoods. Once that and the shroud is removed, the focus screen can be accessed. Note the focus screen is spring loaded to press up in to its place. There is no adjustment to be made.
Thanks for the suggestions but I wasnt able to unscrew them. I cant see a way of getting them out without making a special tool for it. Sending off to Eric tomorrow.

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!
change, pins, position, prism, screen, screen in pentax, screws, tool
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax 67 focusing screen MorizKlonner Pentax Medium Format 7 02-01-2020 09:17 PM
How I replaced my focusing screen with a high-end SLR focusing screen... bygp Pentax DSLR Discussion 18 12-01-2015 07:00 PM
Removing Pentax 67 pressure plate Michal1 Pentax Medium Format 2 05-26-2014 02:14 AM
Focusing manual lens with OEM focusing screen, is a split screen really needed? skid2964 Pentax Camera and Field Accessories 16 09-17-2010 02:54 PM
Removing K100D focusing screen Finn Pentax DSLR Discussion 20 04-25-2007 05:37 AM



All times are GMT -7. The time now is 11:05 PM. | 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