Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-18-2014, 02:57 AM   #1
Site Supporter




Join Date: Nov 2010
Location: Johannesburg
Photos: Albums
Posts: 160
645 135mm LS shutter

Hi there, I hope someone can help.


I bought some 645 kit and I've been testing it and there seems to be an issue with the leaf shutter on the 135mm LS lens. Mounted on the 645n with the LS dial set on 0 it works normally, i.e. as I change the aperture the shutter speed changes and there don't seem to be any problems there. When I change the LS dial to one of the settings, the 645n shows LS as it should, but I can still see through the viewfinder. The lens manual is not clear on this but to me it says that the shutter is already cocked, and the shutter cocking ring also moves easily in either direction. Is there any way to manually un-cock the leaf shutter to check if it is faulty or do I have to take a picture to un-cock it. The lens manual mentions activating the DoF lever to do this but it hasn't worked.


If I have a dud leaf shutter I am not worried as I have a nice portrait lens, but I would like to be able to use the leaf shutter if I can. I got the kit for a very good price and everything is in good condition so I am not going to worry about asking the seller for a refund.

02-18-2014, 05:03 AM   #2
Senior Member




Join Date: Dec 2009
Location: Münsterland
Posts: 128
It is cocked when you can see through the lens. When you pull the lever (red dot at 12:00, lever at 3:00) the iris should start to move to the corresponding f-value and then should close the leaf shutter.
02-18-2014, 11:21 PM   #3
Site Supporter




Join Date: Nov 2010
Location: Johannesburg
Photos: Albums
Posts: 160
Original Poster
QuoteOriginally posted by -Linus- Quote
It is cocked when you can see through the lens. When you pull the lever (red dot at 12:00, lever at 3:00) the iris should start to move to the corresponding f-value and then should close the leaf shutter.
Thanks! I'll give it a try. That seems to confirm that stopping down the lens should close the leaf shutter.


It worked! I find on my one I have to manually return the cocking ring to its original position before taking the shot and then the leaf shutter closes after. I tested all the speeds and it definitely speeds up going from 60 to 500 so it looks like I have a fully functioning lens.

Last edited by Chuckie; 02-20-2014 at 11:22 PM.
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!
135mm, 645, 645n, camera, change, kit, leaf, leaf shutter, lens, ls, medium format, shutter, stuck
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Pentax 645 Leaf Shutter 75mm 2.8, 645-A 150mm F3.5 MightyMike Sold Items 13 04-03-2012 06:47 AM
Any experience on Pentax 645 135mm f/4.0 LS -- Leaf Shutter hinman Pentax Medium Format 11 11-23-2010 05:15 PM
645 SMC-A 135 LS rodneysan Pentax Medium Format 3 03-02-2010 08:11 AM



All times are GMT -7. The time now is 09:49 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