Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
08-17-2017, 06:36 AM   #1
Senior Member

Join Date: Jun 2016
Posts: 264
flange distance & image quality question -- using lenses on different cameras

Just curious as to whether there are any image quality differences in using a lens on different camera systems (other than from inherent camera/sensor differences) and if so how great they might be and if that should influence buying decisions.

In considering a lighter backup camera, possibly Sony FE/E-mount or Fuji mount, if I know I am going to use a specific lens more on the E-mount/Fuji mount than with my K-1 would the FE-mount version of the lens have any significantly better image quality on that system than if I bought it for the K-mount and then adapted it to the second mount. In reading through Fenwoodian's excellent threads detailing tests of adapted Nikon Zeiss lenses and some of the other wonderful threads adopting legacy lenses it would seem that the answer would be that it is an insignificant difference -- but I recognize that Nikon's mount and the m42 mounts are very close in flange distance to the K-mount. If I had my druthers I would just as soon by K-mount and put off the backup system decision until I've properly saved for it but I was curious to here other's thoughts on this.

08-17-2017, 06:53 AM   #2
Site Supporter
Site Supporter
timw4mail's Avatar

Join Date: Apr 2017
Location: Driving a Mirage
Photos: Gallery | Albums
Posts: 1,662
Assuming equivalent sensor size, and the adapted lens has the proper flange distance (without corrective glass), any difference in quality would be due to the sensor itself.
08-17-2017, 07:28 AM   #3
Site Supporter
Site Supporter

Join Date: May 2016
Location: Pittsburgh, Pa.
Photos: Gallery | Albums
Posts: 424
i think your best bet for "a lighter backup camera" would be a Pentax and forget about adaptors. You realize you will loose auto focus with adaptors, right?
08-17-2017, 07:49 AM   #4

Join Date: Jul 2009
Location: Tromsų, Norway
Photos: Albums
Posts: 1,028
If you consider a lighter backup camera, forget about adapters. Adapting lenses adds bulk and weight so the main point vanishes. If you want something notably smaller and lighter, you must choose between going all in for a new system with the same sensor size and small prime lenses or forget about getting similar image quality. Personally I concluded that I will miss the optical viewfinder too much and that a second Pentax DSLR is a good backup. Size and weight is countered by choosing primes in stead of zooms. One advantage of having the same lens mount on my primary and backup camera is that I have a second lens available without spending valuable seconds on changing lenses. Changing camera is faster.

Currently I have a K-5 and a K-x, but the K-x will be degraded to a doughter cam, and K-5 to a backup camera, when I buy the K-1. I just spendt my savings elsewhere so I have to save some more first.

08-17-2017, 07:52 AM   #5
Senior Member

Join Date: Jun 2016
Posts: 264
Original Poster
QuoteOriginally posted by sibyrnes Quote
i think your best bet for "a lighter backup camera" would be a Pentax and forget about adaptors.

I agree and if Pentax releases a body with AF that rivals the D500 I definitely will, but that doesn't seem like it is going to be happening anytime soon and is an entirely different topic ...

Yes, I was thinking mainly of manual focus lenses. There aren't any adapters that allow aperture control of dfa lenses on other cameras that I know of or can someone recommend one I may have overlooked?

  • 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 & image, flange distance, flange distances, image, image quality question, k-mount, lens, lenses, pentax lens, quality, slr lens, threads
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Distance between flange plane and focal plane wings Pentax K-1 3 06-11-2017 05:36 AM
Pentax C30811KP - flange focal distance problem BigMackCam Pentax Q 8 11-28-2016 03:02 PM
Where to measure canon fd flange focal distance? ripit Pentax SLR Lens Discussion 2 01-22-2012 09:29 AM
Flange Distance borsuk Pentax Q 7 11-05-2011 03:38 PM
lens flange sensor distance pixelsaurus Pentax DSLR Discussion 4 02-16-2008 02:38 AM

All times are GMT -7. The time now is 07:50 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]