Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-05-2018, 05:12 AM   #31
Site Supporter
Site Supporter
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 17,869
Just a reminder, the issue with non conducting lens mounts came about with the release of the K10. Before that non conducting lens mounts worked. Same issue with stopping down a lense with auto aperture, cameras older than K10 worked regardless but with the K10 this function disappeared

12-06-2018, 01:02 AM   #32
Veteran Member
cprobertson1's Avatar

Join Date: Nov 2018
Location: Irvine, Ayrshire
Posts: 386
Original Poster
QuoteOriginally posted by Lowell Goudge Quote
Just a reminder, the issue with non conducting lens mounts came about with the release of the K10. Before that non conducting lens mounts worked. Same issue with stopping down a lense with auto aperture, cameras older than K10 worked regardless but with the K10 this function disappeared
Sounds like the post-K10 bodies are at the mercy of their own hubris!

I am currently using adhesive backed copper foil to make the contacts on my nonconductive lenses - this foil is thicker than the aluminium foil I have, so it's not getting damaged the same. It will do until I have a more robust solution!

I still think that a brass shim (0.1-0.3mm would probably be more than enough) cut with a pair of scissors and glued on with some PVC/PVA would be more than sufficient for what we actually need here: it's not like this is a high-

I've also experimented with electroplating, but... realised something pretty quickly... You can't electroplate an insulative surface - which is precisely what we are trying to change by electroplating in the first place!

::epic facepalm:: - Some chemist I am! That was literally first year materials science!
12-06-2018, 07:44 AM   #33
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 28,182
QuoteOriginally posted by cprobertson1 Quote
I've also experimented with electroplating, but... realised something pretty quickly... You can't electroplate an insulative surface - which is precisely what we are trying to change by electroplating in the first place!

::epic facepalm:: - Some chemist I am! That was literally first year materials science!
I wondered about that... But I figured you had some new method I didn't understand!
12-06-2018, 09:56 AM   #34
Site Supporter
Site Supporter
sergysergy's Avatar

Join Date: Jan 2011
Photos: Gallery
Posts: 5,155
When I had problems with CIF it had to do with:
the mount (solved by using kitchen foil between the mount and the camera)
light / the subject not having enough contrast (solved by using a flashlight or trying a different angle)

12-07-2018, 01:19 AM   #35
Veteran Member
cprobertson1's Avatar

Join Date: Nov 2018
Location: Irvine, Ayrshire
Posts: 386
Original Poster
QuoteOriginally posted by UncleVanya Quote
QuoteQuote:
I've also experimented with electroplating, but... realised something pretty quickly... You can't electroplate an insulative surface - which is precisely what we are trying to change by electroplating in the first place!
I wondered about that... But I figured you had some new method I didn't understand!
I believe it'd be possible using a higher plating voltage or a chemical deposition method. I know you can plate phosphate-anodised aluminium (but that has a much thinner surface oxide layer). However, I do wonder... see, the anodised aluminium layer is porous - so it may be possible to absorb an electrolyte into that and then start the electroplating process off with that.

A chemical deposition or electroless plating method would probably be more reliable though, with less chance of accidentally arcing on, near, or across a lens element and covering it in carbon!

It also occured to me that instead of hand-cutting shimming material (though that is also pretty easy!) I could simply get a shim manufacturer to laser cut a small batch of them - they're not terribly costly!
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!
aperture, camera, catch in focus, catch-in, catch-in focus, cif, contacts, focus, focus in ka, how to, k50 / k500, ka, lens, manual focus, manual lens, pentax help, photography, troubeshooting, troubleshooting
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Manual focus K (or KA) zoom lenses with non-rotating front elements? ChrisR Pentax SLR Lens Discussion 13 04-05-2018 08:05 AM
Catch In Focus on AF lenses, is it ok to do? BruceBanner Pentax SLR Lens Discussion 19 09-02-2017 04:48 PM
How to use Trap-focus or Catch-in focus eurostar Pentax DSLR and Camera Articles 34 07-22-2017 08:29 PM
Focus Trapping (aka Catch-In Focus) regor Pentax K-01 7 01-05-2013 11:32 PM



All times are GMT -7. The time now is 05:00 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