Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-09-2009, 12:38 PM   #1
New Member




Join Date: Dec 2009
Location: Zagreb
Posts: 4
pentax k-x sensor problem

Hi,

recently i bought pentax kx with kit lens 18-55mm smc DAL. My problem lies with P and autoPict mode. I know that dslr's arent supposed to be p&s cameras, but it's annoying not to have auto options.

Now the problem:
If i set it to P or AutoPict on indoors with normal (not dark, not bright) lighting with flash on i never get shutter speeds above 1/20 or 1/30, and it likes to go as slow as 1/8. Now my logic tells me if light is so low than it really doesn't make any difference between 1/8 and 1/80 since flash is the only light that will get on the picture. Only problem si that 1/8 will produce blurry images, and 1/80 will produce normal image. So, is this normal behavior for k-x's or is something wrong with body/sensor. I tried to update to firmware 1.01 but nothing changed.

I looked this with other cameras and they mostly have shutter speeds locked to 1/80 or something like that which is normal in my opinion.

And yes, i forgot to mention, aperture is always set to fully open.

P.S. sorry for my english, is't been a while since i used it

Best regards, Marko from Croatia

12-09-2009, 12:56 PM   #2
Pentaxian
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
Hello, and welcome!

I'd assume the camera is trying to balance the flash with ambient light, and is thinking that even with those slow shutter speeds, there won't be so much ambient light that you get blurry pictures. Either that, or something else you have set - like if you have your ISO turned way way up - is making the camera think that you do want to get more ambient light in there. Could you post a picture and tells us what ISO, aperture, and shutter speed were used?
12-09-2009, 01:32 PM   #3
Pentaxian
audiobomber's Avatar

Join Date: May 2008
Location: Sudbury, Ontario
Photos: Albums
Posts: 6,726
Auto ISO gives all kinds of whacky results. The only success I've had is when I manually set the aperture and ISO.
12-10-2009, 07:47 AM   #4
Forum Member




Join Date: Oct 2009
Location: Colorado
Photos: Albums
Posts: 91
Hi Marko,

That is normal behavior, not a defect. I've seen the same on my K-x.

The kind folk here have explained the auto-exposure with flash to me. Pentax cameras set the minimum shutter speed to the steady handhold limit. With SR on, that's a bit slower than 1/FL. With your 18-55 zoomed to 18mm, in P mode, the slowest shutter should be 1/15s. The Kx does not adjust the limit up with SR off, which it probably should.

I only get slower shutters when I turn the e-dial to get a smaller aperture for greater depth of field. I have seen 1/8s when I close down the aperture.

I use Tv or M mode with flash now, when I want to prevent blur. The flash will automatically adjust to expose the subject in M or Tv. In Tv, auto-iso will also work.


Last edited by bnorikane; 12-10-2009 at 08:02 AM.
12-10-2009, 11:05 AM   #5
mRo
New Member




Join Date: Dec 2009
Location: Zagreb
Posts: 4
Original Poster
Didn't have time to take some new pics, but one more thing i forgot to mention, White balance doesn't work either. On M or P mode i select tungsten light and take picture, but resulting picture has AWB not tungsten light. Whatever white balance i select it always says AWB and ofcourse colors don't match with selected WB. I use JPEG, not RAW or RAW+.
12-10-2009, 11:19 AM   #6
Pentaxian
audiobomber's Avatar

Join Date: May 2008
Location: Sudbury, Ontario
Photos: Albums
Posts: 6,726
QuoteOriginally posted by mRo Quote
Didn't have time to take some new pics, but one more thing i forgot to mention, White balance doesn't work either. On M or P mode i select tungsten light and take picture, but resulting picture has AWB not tungsten light. Whatever white balance i select it always says AWB and ofcourse colors don't match with selected WB. I use JPEG, not RAW or RAW+.
You can't make some changes in Green mode or auto picture modes. Try shooting in P mode, it is an auto mode, but allows user control.
12-10-2009, 11:22 AM   #7
mRo
New Member




Join Date: Dec 2009
Location: Zagreb
Posts: 4
Original Poster
I know, i tried to make changes in P and in M mode and when i choose it shows it on the screen as being selected, but when i take picture, on the picture info it says AWB (and as i said earlier colors don't match with selection, so i know for sure it's AWB)
12-10-2009, 11:30 AM   #8
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,696
You should have no trouble choosing your own WB on P, Av, Tv, and M modes on the camera.
Try it again with a non-auto mode and see how the shutter speed and WB behaves.

12-10-2009, 12:21 PM   #9
mRo
New Member




Join Date: Dec 2009
Location: Zagreb
Posts: 4
Original Poster
Sorry, my bad, i found option that AWB was linked with flash. But slow shutter problem persists

Last edited by mRo; 12-11-2009 at 01:17 AM.
12-10-2009, 02:32 PM   #10
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,696
Try Av mode - does the shutter speed go slower than 1/(focal length)?
12-10-2009, 05:17 PM   #11
Forum Member




Join Date: Oct 2009
Location: Colorado
Photos: Albums
Posts: 91
Marko,

As you found, with flash on, camera will use the WB that you set in menu C-2-8 "WB when using Flash". Default is AWB, but you can change it to use your set WB or Flash WB.


In Auto Pict/green mode, the camera forces AWB.

In other modes, PASM without flash, the camera will use what you set.
12-10-2009, 05:35 PM   #12
Forum Member




Join Date: Oct 2009
Location: Colorado
Photos: Albums
Posts: 91
QuoteOriginally posted by mRo Quote
But slow shutter problem persists
Try Tv or M with flash.

I fought this for awhile, but it's really easy. The camera will auto adjust flash power (and ISO if in auto iso) to get the exposure right.

For example, in M set shutter to 1/80 and A to f/8, auto-iso and flash up. Just snap away.

Try it, you may like it.
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!
autopict, camera, cameras, flash, light, pentax, pentax help, pentax k-x sensor, photography, shutter, speeds
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sensor Problem kirstenincanada Pentax DSLR Discussion 17 04-28-2010 10:07 AM
Another spots on sensor problem. photolady95 Troubleshooting and Beginner Help 11 02-24-2010 04:56 PM
Does my sensor have a problem? amaurosis Pentax DSLR Discussion 7 08-17-2009 05:31 AM
K20D sensor problem? bergfire Troubleshooting and Beginner Help 5 04-21-2009 06:07 AM
K200D sensor problem? mholland Pentax DSLR Discussion 9 02-19-2009 08:16 PM



All times are GMT -7. The time now is 04:37 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