Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
01-04-2013, 12:24 PM - 1 Like   #16
Veteran Member

Join Date: Jan 2009
Location: Victoria, BC
Photos: Gallery | Albums
Posts: 350
The short answer is: if the camera is unable to know what the selected aperture is (vs actual, e.g. the M lenses), it has no way to tell what the metering is either.

If the camera is aware that the current actual aperture can only be the selected aperture, then it can display metering info (e.g. the TAIR lens). With lenses that remains wide open until you take the photo not in "A" mode, you need to hit the green button to close the aperture and take a light reading to determine the matching speed. Any other time, you could change the aperture setting and the camera would remain unaware until you hit the green button again, hence it is impossible for the camera to display metering information.


  • 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!
change, focus, iso, k-01, k01, lens, light, meter, mirrorless, mode, pentax k-01, stop-down
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
New to Pentax, Just got K-o1:Some questions cristigj Pentax K-01 4 12-23-2012 01:09 AM
How to meter if you don't have a light meter? LFLee Pentax Medium Format 25 02-09-2012 11:45 AM
Pentax ES II: Light meter does not work in a manual mode ? svn.ictus Pentax Film SLR Discussion 5 09-04-2011 06:47 PM
Is there a cheap light meter for usage with manual lenses? justtakingpics Pentax SLR Lens Discussion 19 04-06-2011 09:29 PM

All times are GMT -7. The time now is 05:45 PM. | 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]