Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-27-2019, 08:28 AM   #1
Junior Member




Join Date: Aug 2018
Posts: 43
67 TTL Cover Removal / Adjustment

I have the shutter dial components and the six small perimeter screws removed. The cover begins to lift up at the shutter dial arm, and at the back, near the eyepiece, but I cannot lift it up at the front, near the ďPENTAXĒ nameplate. This is a newer (s/n 639256) 67 prism, so I didnít think there were additional screws up front that I missed. Thereís a nice YouTube disassembly video by ĎLens Heavení, but he completely jumps over that step. Are there more screws that Ive missed? I donít want to break the cover.

Why am I doing this? My TTL over-exposes by 1.5 stops (compared by multiple means) and Iím curious if I can do the adjustment on my own. [Not opposed to buying a handheld meter - Iím just trying to baseline the Ďnewí 67 first.]

There was a forum post by ĎMysteryOnioní some years ago on adjusting one of the three meter adjustment screws, but he was inconclusive (ie: he forgot) exactly which screw to turn. I donít mind the trial and error process, as Iím pretty careful to back-track methodically, and I love a challenge.

Anyone done this recently?

Thanks in advance.


Last edited by Kmier; 07-27-2019 at 08:39 AM.
07-27-2019, 09:04 AM   #2
Pentaxian




Join Date: Jul 2009
Location: Seattle
Posts: 8,281
I've never took mine apart so I can't say. But how do you know your middle gray is being placed 1.5 stops to high?
07-27-2019, 10:27 AM   #3
Junior Member




Join Date: Aug 2018
Posts: 43
Original Poster
tuco - Iíve not used an 18% gray card formally yet, so I know Iím not extremely precise. Iíve downloaded the Ďmy light meter proí app, and found various low contrast areas on the outside my house early this morning to compare to. This app seems to be one of the more highly-rated for $3.99. I see almost identical results to my 645 readings; certainly within 1/2 a stop.

Clearly, Iím still learning, so please bear with me. 😉
07-27-2019, 11:26 AM   #4
Pentaxian




Join Date: Jul 2009
Location: Seattle
Posts: 8,281
Okay. I have an aging Pentax TTL prism too. I never thought about checking it for accuracy. But maybe I should.

I didn't catch if you are going to be shooting BW, C-41 or E-6 film primarily. But in the case of BW and color negatives, don't over think it. Just go out and shoot. Use the feedback you get to learn when to tweak setting from your light meter readings. Those pictures I posted using the lightmeter app show that for two types of film and lighting conditions it placed shadows and highlights in the recordable range of the film. That's a good start. What more could you want?


Last edited by tuco; 07-27-2019 at 11:39 AM. Reason: Spelling
07-27-2019, 11:57 AM   #5
Site Supporter
Site Supporter
johnha's Avatar

Join Date: Apr 2012
Location: Lancashire, UK
Photos: Albums
Posts: 785
I have the same phone meter app, I had to calibrate it with a known meter (still not sure it's a linear correction). As above from tuco (he knows his stuff!) shoot some film, note the readings and check what you get back, adjust and repeat.

All meters need the user to compensate for their own preferences, metering technique, EI, stock, development, printing etc.
07-27-2019, 12:00 PM   #6
Junior Member




Join Date: Aug 2018
Posts: 43
Original Poster
tuco - sorry, I tend to overthink about everything...thatís a fault of mine 😁

I plan to stick to color negatives; possibly B&W once again. If I canít find a service manual online, I may throw in the towel and ship it to Eric for a full CLA plus meter adjustment.

Thanks for the reply.

---------- Post added 07-27-19 at 12:06 PM ----------

QuoteOriginally posted by johnha Quote
I have the same phone meter app, I had to calibrate it with a known meter (still not sure it's a linear correction). As above from tuco (he knows his stuff!) shoot some film, note the readings and check what you get back, adjust and repeat.

All meters need the user to compensate for their own preferences, metering technique, EI, stock, development, printing etc.
John - thanks; I just dropped my first roll in the mail to The Darkroom - I instructed them to Ďpull -1.0 stopí, sort of as a compromise adjustment.
07-27-2019, 12:50 PM   #7
Pentaxian




Join Date: Feb 2009
Location: Arizona
Posts: 1,116
If I shot print film, I would not try to adjust the TTL, especially when it is not too far off and overexposing by 1.5 stops. Slide film is another matter completely.
07-27-2019, 03:44 PM   #8
Pentaxian
Silent Street's Avatar

Join Date: Nov 2011
Location: Melbourne, Australia.
Photos: Albums
Posts: 803
Oh dear...

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!
645d, 645z, adjustment, camera, cover, front, medium format, meter, screws, shutter, thanks, ttl, ttl cover removal
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
P67 ttl pentaprism finder better than 6x7 ttl pentaprism? Bjun Pentax Medium Format 10 04-02-2019 02:24 PM
All lens needs AF fine adjustment, does the camera need a global adjustment? Thanks bennyxyz Troubleshooting and Beginner Help 9 04-21-2016 12:36 PM
MX-1 aftermarket Lens Cover removal! rosettaquarrier Pentax Compact Cameras 9 11-21-2015 04:36 PM
ME Super Top Cover Removal MajorClanger Pentax Film SLR Discussion 7 08-24-2011 07:29 PM



All times are GMT -7. The time now is 01:57 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