Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-20-2010, 03:54 PM   #1
Veteran Member
jct us101's Avatar

Join Date: Jun 2008
Location: Rohnert Park, CA
Posts: 3,695
Does the K-x have a tendency to underexpose?

I noticed this last night, during the sunset photos it worked out to my advantage, but as it got darker and darker while using AV mode I noticed that the exposures were not nearly long enough.

06-20-2010, 04:37 PM   #2
Pentaxian
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
Shouldn't be the case in general - at least, no more so than any other ISO-compliant camera (eg, tries to make a scene a little darker than 18% on average, even if the actual scene is lighter than that). Feel free to post samples if you think your camera is doing something other than that.
06-20-2010, 06:55 PM   #3
Veteran Member
Ecaterin's Avatar

Join Date: Nov 2009
Location: Seattle
Photos: Gallery | Albums
Posts: 723
Interesting - I've been running into the opposite issue under certain circumstances. Especially under fluorescent light I have to dial EV down so my exposure times are short enough that I don't have to worry about blown highlights when I'm processing. Either that or I aim the camera some place extra bright to meter and then snap my photo
06-20-2010, 10:22 PM   #4
Veteran Member




Join Date: Nov 2009
Location: Pittsburgh, PA
Posts: 479
With my K-x it had a tendency to overexpose. It liked -.3 EV. From what I've read, the K-7 is the opposite, liking +.3 EV.

06-21-2010, 02:12 AM   #5
Veteran Member
KxBlaze's Avatar

Join Date: Feb 2010
Location: California
Photos: Gallery
Posts: 1,594
QuoteOriginally posted by jct us101 Quote
I noticed this last night, during the sunset photos it worked out to my advantage, but as it got darker and darker while using AV mode I noticed that the exposures were not nearly long enough.
I noticed that on mine too. It's second nature for me to shoot at +.3, I don't think twice about it. I shoot 95% in M mode and I always err on the + side.
06-21-2010, 07:28 AM   #6
Senior Member
bigdog104's Avatar

Join Date: Apr 2010
Location: South Carolina
Photos: Gallery
Posts: 289
Mine seems to underexpose in very bright sunlight, I tend to shoot +1 EV. The histogram shows this as well.
06-21-2010, 08:02 AM   #7
Forum Member




Join Date: Mar 2010
Location: Irvine
Posts: 84
Were you using M42 lens on it?

I believe that K-X doesn't give an accurate metering with M42 lenses.

For outdoor shots with my super-multi-coated Takumar 50mm 1.4, I have to dial in +2 EV for the correct exposure.
06-21-2010, 08:42 AM   #8
Pentaxian
audiobomber's Avatar

Join Date: May 2008
Location: Sudbury, Ontario
Photos: Albums
Posts: 6,631
I like the way my K20D exposes in Matrix mode. My K-x tends to overexpose (clips highlights).

06-21-2010, 10:34 AM   #9
Pentaxian
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
QuoteOriginally posted by bigdog104 Quote
Mine seems to underexpose in very bright sunlight
Again, this is not generally underexposure. Sounds like the camera is following the standards of exposure correctly (as they've been followed for around a century). The standards call for the camera to render scenes in "average" brightness (histogram centered half a stop or so left of center). Scenes brighter than average are *supposed* to come out looking darker than they appear in life unless you apply compensation.
06-21-2010, 11:04 AM   #10
Site Supporter
GeneV's Avatar

Join Date: Oct 2008
Location: Albuquerque NM
Photos: Albums
Posts: 9,765
QuoteOriginally posted by audiobomber Quote
I like the way my K20D exposes in Matrix mode. My K-x tends to overexpose (clips highlights).
I also get more overexposed shots from the K-x than other Pentax bodies. However, saying the camera overexposes may not be accurate.

Every meteriing system has its quirks, and it is up to me to learn them.
06-21-2010, 11:13 AM   #11
Pentaxian
audiobomber's Avatar

Join Date: May 2008
Location: Sudbury, Ontario
Photos: Albums
Posts: 6,631
QuoteOriginally posted by GeneV Quote
I also get more overexposed shots from the K-x than other Pentax bodies. However, saying the camera overexposes may not be accurate.

Every metering system has its quirks, and it is up to me to learn them.
I agree with you Gene, yours is a more accurate statement.

I find it a bit frustrating that Pentax decided to push the exposure in the K-x, but it's not surprising they did, since they were criticized repeatedly in reviews for what I consider accurate exposures (i.e. protecting the highlights). I've been using CW metering with the K-x, as it seems less likely to overexpose than Matrix metering.
06-21-2010, 11:20 AM   #12
Pentaxian
audiobomber's Avatar

Join Date: May 2008
Location: Sudbury, Ontario
Photos: Albums
Posts: 6,631
QuoteOriginally posted by Marc Sabatella Quote
Again, this is not generally underexposure. Sounds like the camera is following the standards of exposure correctly (as they've been followed for around a century). The standards call for the camera to render scenes in "average" brightness (histogram centered half a stop or so left of center). Scenes brighter than average are *supposed* to come out looking darker than they appear in life unless you apply compensation.
This is really what this thread is about. It's a very common complaint with new users. I think compact cameras set up an expectation that the camera will guess at what you're trying to expose, whereas with a Pentax dslr, the photographer has to make the decision.
06-21-2010, 12:19 PM   #13
Senior Member
bigdog104's Avatar

Join Date: Apr 2010
Location: South Carolina
Photos: Gallery
Posts: 289
Not sure what a "new" user is, the K-X is my fifth SLR and second DSLR, all of them Pentax. In certain situations the camera underexposes and I compensate with EV of around +1. Again this is shown by the histogram. I am happy with the camera and don't see this as a complaint, As some folks have already said, all cameras have certain quirks and characteristics that you have to get used to.

Last edited by bigdog104; 06-21-2010 at 02:32 PM. Reason: Grammer
06-21-2010, 02:23 PM   #14
Site Supporter
GeneV's Avatar

Join Date: Oct 2008
Location: Albuquerque NM
Photos: Albums
Posts: 9,765
QuoteOriginally posted by audiobomber Quote
I agree with you Gene, yours is a more accurate statement.

I find it a bit frustrating that Pentax decided to push the exposure in the K-x, but it's not surprising they did, since they were criticized repeatedly in reviews for what I consider accurate exposures (i.e. protecting the highlights). I've been using CW metering with the K-x, as it seems less likely to overexpose than Matrix metering.
I agree that it is a bit frustrating when you get used to a manufacturer's way of doing things, and they change it. My experience is also that the K10/20d tended to protect the highlights in a way that the K-x does not. I generally use CW for my other Pentax bodies, and perhaps I should double check that the K-x is not set for matrix.
06-21-2010, 06:54 PM   #15
Pentaxian
audiobomber's Avatar

Join Date: May 2008
Location: Sudbury, Ontario
Photos: Albums
Posts: 6,631
QuoteOriginally posted by bigdog104 Quote
Not sure what a "new" user is, the K-X is my fifth SLR and second DSLR, all of them Pentax. In certain situations the camera underexposes and I compensate with EV of around +1. Again this is shown by the histogram. I am happy with the camera and don't see this as a complaint, As some folks have already said, all cameras have certain quirks and characteristics that you have to get used to.
There have been many threads here started by new users, where the complaint is that the K-x underexposes. When aked to show an example, they show a dark subject framed against a bright sky and/or water. It's invariably a clear case where +Ev was needed and not applied. That's what I'm talking about.
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, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
My ltd lens doesn't underexpose (woot) alehel Pentax SLR Lens Discussion 5 05-05-2009 12:41 PM
K20D underexpose seripusly mrechte Pentax DSLR Discussion 88 06-21-2008 06:47 PM



All times are GMT -7. The time now is 08:24 PM. | 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