Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
6 Days Ago   #1
New Member

Join Date: Apr 2019
Posts: 2
Yashica lens assembling

Hi, can anyone help me to assemble focus ring on Yashica Yashinon-ds 50mm f1.9? I open it to clean fungus, and i did it very well but now cant return that piece on photos on place. Any suggestion would be nice, thank you

Attached Images
6 Days Ago   #2
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 5,334
General advice: The larger steep-pitched threads that focus the lens have several starting points. You can count the points where the threads run out when the lens is apart. Often it's three starting points, 120 degrees apart. Usually only one starting point will work, that is, all the other parts end up in the right place at the right time. You'll need some trial and error to figure it out. First count the points, so you'll know how to adjust when your first try doesn't work. Mark the parts somehow so you know where you started. Then make an attempt. If it doesn't work, unscrew the large threads carefully so you can tell exactly when they separate. Then rotate the front group 120 degrees or whatever and engage the next set of threads. It's like Rubik's Cube - some observation of all the moving parts helps figure it out. Sorry I can't give specific advice for your particular lens.
6 Days Ago   #3
Site Supporter
Site Supporter

Join Date: Dec 2009
Location: In the Florida swamps
Posts: 94
Based on the 3rd picture you have the outer helicoid ring out way too far. For that lens a good starting point would be to turn it until it is about 4mm off the base. Then adjust a little to get the sliders aligned with the inner helicoid/element assembly.
5 Days Ago   #4
New Member

Join Date: Apr 2019
Posts: 2
Original Poster
Thank you all. I did it after 3 days of trying


  • 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, pentax help, photography, troubleshooting, yashica, yashica lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Unusual and fast mirror lens - Yashica Reflex Yashinon-DX f/5 500mm Dean Bradshaw Pentax SLR Lens Discussion 12 05-01-2018 12:07 PM
Assembling the Neutral Density filter team Cagey Beatrice Pentax Camera and Field Accessories 11 05-15-2017 07:47 AM
I need help in assembling a panoramic image. Stagnant Digital Processing, Software, and Printing 9 09-25-2014 12:48 PM
assembling:Porst Color Reflex Mc Auto 1.2 55mm willdmo Pentax Lens Articles 7 10-10-2011 03:05 AM
dis assembling a Super Takumar 35mm F3.5 Gooshin Pentax SLR Lens Discussion 4 03-09-2009 07:04 AM

All times are GMT -7. The time now is 09:29 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]