Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-13-2014, 04:11 PM   #1
Senior Member




Join Date: Oct 2013
Posts: 206
K3 meter reading

I have a question about my meter readings on my K3. For example, if I use a FA lens set to auto and have the camera set to AV I get correct meter readings in all three meter settings. If I go to manual with the FA lens set the lens to an f stop push the green button in any of the three meter settings the exposure is one stop off. The green meter reading needs to be stopped down one stop for a correct exposure. Am I operating incorrectly or is there a setting that requires changing or is this just the way it works? Thanks for your comments.

03-13-2014, 04:32 PM   #2
Inactive Account




Join Date: Dec 2008
Location: North Carolina
Photos: Albums
Posts: 1,720
Stop down metering with the optical viewfinder tends to be inaccurate below about f5.6. This is because the stock focusing screen is optimized for maximum brightness it is actually a little too bright at smaller apertures. Metering in live view is unaffected by this. This is usually only an issue if you are using a lens without an A position on the aperture ring, as normally the meter reading is taken wide open and most lenses are fast enough.

You can leave your FA lens on A and still have full manual exposure, stop down metering is totally unnecessary unless you don't have A contacts. You can use the green button in M mode with the lens on A as well, it does not require the lens to be stopped down.
03-15-2014, 06:34 AM   #3
Senior Member




Join Date: Oct 2013
Posts: 206
Original Poster
QuoteOriginally posted by elliott Quote
Stop down metering with the optical viewfinder tends to be inaccurate below about f5.6. This is because the stock focusing screen is optimized for maximum brightness it is actually a little too bright at smaller apertures. Metering in live view is unaffected by this. This is usually only an issue if you are using a lens without an A position on the aperture ring, as normally the meter reading is taken wide open and most lenses are fast enough.

You can leave your FA lens on A and still have full manual exposure, stop down metering is totally unnecessary unless you don't have A contacts. You can use the green button in M mode with the lens on A as well, it does not require the lens to be stopped down.
elliott, thanks for the helpful tips. For some reason when using M lenses on the M setting , I must stop down about 1 stop from the meter reading in order not to over exposed the image. Is this because of the K3 not metering correctly with the old M lenses?
03-15-2014, 07:05 AM   #4
Pentaxian
Tjompen1968's Avatar

Join Date: May 2012
Location: Norrköping, Sweden
Photos: Gallery | Albums
Posts: 1,288
Are you using Live View or the oprtical view finder? Do you have your eye against the view finder when pushing the green button?

03-15-2014, 07:10 AM   #5
Lens Buying Addict
monochrome's Avatar

Join Date: Mar 2008
Location: Kirkwood (St. Louis) MO
Photos: Gallery | Albums
Posts: 19,497
QuoteOriginally posted by elliott Quote
Stop down metering with the optical viewfinder tends to be inaccurate below about f5.6.
I haven't had this problem with my K3. It meters very well for me using the Optical Preview Lever (not the Grren Button). But I rarely shoot below f/5.6 with manual lenses.

I guess I know what I will do with my play time this weekend.
03-15-2014, 12:53 PM   #6
Senior Member




Join Date: Oct 2013
Posts: 206
Original Poster
QuoteOriginally posted by monochrome Quote
I haven't had this problem with my K3. It meters very well for me using the Optical Preview Lever (not the Grren Button). But I rarely shoot below f/5.6 with manual lenses.

I guess I know what I will do with my play time this weekend.
This is the method I have been using with the m lenses. I'll set the f stop, focus and compose, push the green button and take the photo. I do this using the finder not live view. After taking the photo and view the results ( in camera ) the photo is over exposed about one stop. If I use the +/- button set -1 stop take another photo using the same procedure view the photo looks correct and will match the photo taken with a FA lens in auto or manual setting. Hopefully I explained this so you can understand what happens.
03-15-2014, 01:41 PM   #7
Lens Buying Addict
monochrome's Avatar

Join Date: Mar 2008
Location: Kirkwood (St. Louis) MO
Photos: Gallery | Albums
Posts: 19,497
QuoteOriginally posted by bscott Quote
This is the method I have been using with the m lenses. I'll set the f stop, focus and compose, push the green button and take the photo. I do this using the finder not live view. After taking the photo and view the results ( in camera ) the photo is over exposed about one stop. If I use the +/- button set -1 stop take another photo using the same procedure view the photo looks correct and will match the photo taken with a FA lens in auto or manual setting. Hopefully I explained this so you can understand what happens.
There are lots of threads about metering issues using M and K lenses and the Green Button. Pentax removed the part of the camera that senses the aperture setting (the coupler) from the camera bodies some years ago. Since that time proper metering with M and K lenses or manual with any lens using th aperture ring has been more an art than a science. You can do it, with limitations and with some experience learning how to compensate for GB idiosyncrasies.

Your issue sounds about par for the course.
03-16-2014, 07:41 AM   #8
Senior Member




Join Date: Oct 2013
Posts: 206
Original Poster
QuoteOriginally posted by monochrome Quote
There are lots of threads about metering issues using M and K lenses and the Green Button. Pentax removed the part of the camera that senses the aperture setting (the coupler) from the camera bodies some years ago. Since that time proper metering with M and K lenses or manual with any lens using th aperture ring has been more an art than a science. You can do it, with limitations and with some experience learning how to compensate for GB idiosyncrasies.

Your issue sounds about par for the course.
monochrome, now that I know there is no coupler for the aperture setting explains how it is working. I did not know this since I am coming from a PZ1P to the K3. I have also been using my FA lens with an aperture setting which now I know should be set at A this puts a whole new light on the subject. Now when using the M lenses I'll set the adjustment for the exposure and move on. Thanks for your help.

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!
dslr, exposure, fa, k-3, k3, k3 meter, lens, meter, pentax k-3, readings, settings
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Light Reading srrman Troubleshooting and Beginner Help 8 02-13-2013 08:09 AM
How to meter if you don't have a light meter? LFLee Pentax Medium Format 25 02-09-2012 11:45 AM
67 Meter Prism light reading 'drop out' jan normandale Pentax Medium Format 11 09-28-2011 06:39 PM
KR exposure meter reading wrong grimmy2016 Pentax K-r 13 09-06-2011 02:42 AM



All times are GMT -7. The time now is 02:20 AM. | See also: NikonForums.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