Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-23-2013, 05:10 PM   #1
Junior Member




Join Date: Dec 2011
Location: Auvergne
Photos: Gallery
Posts: 45
Q mount register distance

I enjoyed looking at this table comparing register distances :

http://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html

It appears that the Q has the smaller register distance of all cameras anytime :-) Only 9.2 mm !!!
This means that, provided the image circle is big enough, it should be capable to accept any lens ! (with an optional extension ring if required)
It looks great to me an to my tiny recently bought white Q.
Wanted to share that...

01-23-2013, 05:45 PM   #2
Pentaxian
hnikesch's Avatar

Join Date: May 2009
Location: Michigan, USA
Photos: Albums
Posts: 1,254
It is even shorter than a CS cctv camera but no adapter is available yet

Hans
01-24-2013, 08:08 AM   #3
Loyal Site Supporter
drougge's Avatar

Join Date: Jan 2010
Location: Malmö
Photos: Gallery
Posts: 787
The registration distance is the optical distance to the sensor, not how far from various plastic parts the mount is. And most lenses stick into their mounts.

I have adapted CS lenses by gluing them in a hole I made in a body cap, and I can tell you from experience that you sometimes have to remove some of the original CS mount so it won't hit the electrical contacts in the upper part of the mount. I doubt there is any proper standard for how far CS lenses go into their mount, there certainly doesn't seem to be any great care taken to get the registration distance right.
01-24-2013, 08:47 AM   #4
Pentaxian
hnikesch's Avatar

Join Date: May 2009
Location: Michigan, USA
Photos: Albums
Posts: 1,254
QuoteOriginally posted by drougge Quote
The registration distance is the optical distance to the sensor, not how far from various plastic parts the mount is. And most lenses stick into their mounts.

I have adapted CS lenses by gluing them in a hole I made in a body cap, and I can tell you from experience that you sometimes have to remove some of the original CS mount so it won't hit the electrical contacts in the upper part of the mount. I doubt there is any proper standard for how far CS lenses go into their mount, there certainly doesn't seem to be any great care taken to get the registration distance right.
I also have a CS lens that touches the electrical contacts but the camera seems to ignore it??? maybe it is insulated by the paint on the lens. I would have to machine away part of the lens for it to clear.

Hans

01-24-2013, 09:08 AM   #5
Loyal Site Supporter
drougge's Avatar

Join Date: Jan 2010
Location: Malmö
Photos: Gallery
Posts: 787
QuoteOriginally posted by hnikesch Quote
I also have a CS lens that touches the electrical contacts but the camera seems to ignore it??? maybe it is insulated by the paint on the lens. I would have to machine away part of the lens for it to clear.
It seems fine to short the contacts in my experience. And my lens only hits the contacts because they're first, it would hit the plastic ridge they sit on if they weren't there. (I removed maybe 2mm of it, and it still shorts the contacts.)
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!
camera, distance, mirrorless, pentax q, pentax q10, pentax q7, q10, q7
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Q Mount Watch JPT Pentax Q 10 07-09-2014 10:32 AM
Q to OM mount?? Shanti Pentax Q 2 12-14-2012 06:47 PM
Register Distance and Lens Types Aegon Pentax K-01 3 02-29-2012 12:39 PM
The register reviews Q garethwebber Pentax Q 1 02-10-2012 08:26 PM
Q about: Hyperfocal distance + focus scales vincechu Troubleshooting and Beginner Help 14 03-16-2011 06:05 PM



All times are GMT -7. The time now is 10:06 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