Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-10-2009, 01:14 AM   #1
Veteran Member
xjjohnno's Avatar

Join Date: Jan 2009
Location: Melbourne Australia
Photos: Gallery
Posts: 2,115
K20D light metering issue

A weird and annoying behaviour performed by the camera today was some seriously out of whack light metering that killed some interesting pics due to severe over exposures. For some weird reason the camera eventually decided to behave itself. On looking at the exif I was getting pictures taken at around 1/125 in strong sunlight where I'd normally expect up to 1/4000. The lens in use was a Pentax DA 55-300mm. Granted I'd been slack about resetting the camera to P mode after some manual lens usage at TAV mode but considering I'd been using the same lens the day before without problems I somehow doubt that was the issue. No settings have been changed recently so not an issue of the idiot in control of the camera ere. Any ideas on what might have been causing the problem or am I looking at playing the role of irate customer and putting in a warranty claim?

05-10-2009, 01:49 AM   #2
Pentaxian




Join Date: Sep 2006
Location: Kaunas
Posts: 1,452
Show us examples!

Show us some problematic pictures with intact EXIF info.

Otherwise it is impossible to tell something.
05-10-2009, 03:01 AM   #3
Senior Member




Join Date: Mar 2009
Location: Perth - Australia
Photos: Albums
Posts: 214
QuoteOriginally posted by xjjohnno Quote
A weird and annoying behaviour performed by the camera today was some seriously out of whack light metering that killed some interesting pics due to severe over exposures. For some weird reason the camera eventually decided to behave itself. On looking at the exif I was getting pictures taken at around 1/125 in strong sunlight where I'd normally expect up to 1/4000. The lens in use was a Pentax DA 55-300mm. Granted I'd been slack about resetting the camera to P mode after some manual lens usage at TAV mode but considering I'd been using the same lens the day before without problems I somehow doubt that was the issue. No settings have been changed recently so not an issue of the idiot in control of the camera ere. Any ideas on what might have been causing the problem or am I looking at playing the role of irate customer and putting in a warranty claim?
are you using a split prism screen? or spot metering? im suffering similar issues!

Thanks

Steve
05-10-2009, 03:56 AM   #4
Veteran Member
xjjohnno's Avatar

Join Date: Jan 2009
Location: Melbourne Australia
Photos: Gallery
Posts: 2,115
Original Poster
Using spot metering Steve centre weighted. Samples are no longer available as after looking into their properties I dumped them.. Most likely scenario I'm afraid might be the idiot behind the camera as I probably inadvertently set the wheel for shutter speed rate rate. The shutter speeds were all at 1/125 sec as a constant which would suggest that I'd moved the wheel to control that without knowing I'd done so as auto metering would have set different shutter speeds to match a variety of differing conditions.

05-10-2009, 09:35 PM   #5
New Member




Join Date: Mar 2009
Location: Perth Australia
Posts: 19
QuoteOriginally posted by xjjohnno Quote
Most likely scenario I'm afraid might be the idiot behind the camera as I probably inadvertently set the wheel for shutter speed rate rate. The shutter speeds were all at 1/125 sec as a constant which would suggest that I'd moved the wheel to control that without knowing I'd done so as auto metering would have set different shutter speeds to match a variety of differing conditions.
There's a setting that allows the camera to temporarily auto-adjust the shutter speed in Tv mode, if exposure cannot be met on current settings. From memory it's custom setting 10 - auto exposure compensation. I turn it on as a safeguard, in case i need to make a rapid shot without having time to check or change settings, or even if i forget that i'm on wrong settings
05-11-2009, 06:46 PM   #6
Pentaxian
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Posts: 10,108
QuoteOriginally posted by xjjohnno Quote
Using spot metering Steve centre weighted.
Were you using spot or center weighted? Your post doesn't specify.
If you were using spot metering and not compensating each and every exposure to take the reflectivity of what was in the metering zone into account, your exposures would be completely whacked.
I still question the wisdom of putting spot metering onto a DSLR, but apparently I'm in a minority.
However, if you don't know what a spot meter does, and if you don't know how to use a spot meter, you are pretty much guaranteed to get bad exposures with spot metering.
05-11-2009, 09:04 PM   #7
Veteran Member
xjjohnno's Avatar

Join Date: Jan 2009
Location: Melbourne Australia
Photos: Gallery
Posts: 2,115
Original Poster
Probably phrased it wrong, centre weighted metering was the metering setting. Pics that went silly were not likely to be affected by reflections. A picture of a kite, blue sky back ground, a bird foraging in the grass with dried grass and earth with the final set of pictures being an air ambulance taking off with a building and then the sky as the back ground. Metering issues would have been noticed straight away if I'd been keeping an eye on the shutter speeds read out in the view finder.
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, dslr, issue, lens, light, mode, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
K20D - Metering in low light conditions rsk Pentax DSLR Discussion 10 11-16-2010 10:05 PM
Help - Metering issue neoyoda Pentax DSLR Discussion 7 09-18-2010 12:52 PM
Light Metering Mode K20D mattmiles Troubleshooting and Beginner Help 3 12-02-2009 07:55 PM
ZX-M metering issue LMRacing Pentax Film SLR Discussion 5 09-13-2009 07:41 PM
*istD metering issue eccs19 Pentax DSLR Discussion 5 06-30-2009 07:43 AM



All times are GMT -7. The time now is 12:54 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