Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
10-17-2015, 04:48 PM   #1
RockvilleBob's Avatar

Join Date: Dec 2011
Location: Lewes DE USA
Photos: Albums
Posts: 1,777
C5 Linking Exposure and Focus Point

When is this useful? Would this be useful for shooting birds in flight to get better exposure for the bird without going to spot metering, tough to keep the spot on the bird?

10-17-2015, 05:07 PM   #2
Veteran Member
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,996
That option applies only to matrix metering.... but I rather choose not to since the exposure will depend on what you focus on before the shutter is tripped. Of course, that's my understanding, which could be wrong.
10-17-2015, 06:30 PM   #3
Otis Memorial Pentaxian
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 37,232
QuoteOriginally posted by aleonx3 Quote
That option applies only to matrix metering
That is my understanding as well, but the end result is similar to a moving spot reading. I don't use it, but can imagine it would be useful for BIF and similar subjects. (The traditional approach for BIF is to use manual exposure based on an incident light reading.)

10-18-2015, 02:13 AM   #4
mcgregni's Avatar

Join Date: Sep 2012
Location: Surrey, England
Posts: 2,603
The classic example of when NOT to use it would be when focusing on the bright white sail of a yacht in the middle of a deep blue sea .... Here the full matrix pattern would pick a better EV based on the predominant mid tones on the areas that are not in focus. So conversely, the time to use it would be when its a mid-toned area that is your main subject .... Some portraits would fit that scenario.

It's a different concept to spot metering, although its tempting to equate the two as we see the red focus indicator in the viewfinder, which can make it seem the same as spot metering. I guess its really a bias of metering weighting based around the in focus areas, which could be covered by any of the focus points. It's actual angle of effect would vary depending on this, whereas spot mode is a fixed angle of view.

10-18-2015, 07:15 AM   #5
Veteran Member
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,996
IMHO, spot metering is entire different, which in essence ignore the rest of the scene except for the small area where the focus is landed. In matrix metering, they use an algorithm involving different weights applied depending on the complexity of lighting of the entire frame. So, if you use Matrix metering with C5 applied, the exposure could be different depending on the focus point selected.

  • 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!
bird, dslr, exposure, k-3, k3, pentax k-3, spot
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Third-party lenses and Focus point selection khenna Pentax K-30 & K-50 2 03-27-2015 11:58 AM
Linking Spot Metering to AF Point radeg Pentax K-5 4 11-26-2012 06:05 AM
Pentax 55mm 1.4 Point to Point Focus Speed MBT74 Pentax SLR Lens Discussion 22 10-16-2012 06:35 AM
Linking AE to AF Point during Multi-Segment Metering i_trax Pentax DSLR Discussion 3 05-21-2012 05:28 AM
Linking AF point and AE during multi-seg metering geckogrin Pentax DSLR Discussion 3 08-21-2010 07:59 PM

All times are GMT -7. The time now is 09:43 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]