Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-19-2015, 03:02 PM   #1
Loyal Site Supporter




Join Date: Aug 2010
Location: Toronto
Posts: 2,004
K5 II s overexposing in extreme cold??

Dear Fellow Pentaxians.

I'm hoping you can set my anxieties to rest, or tell me what i need to do if there is a problem. I stopped in Boston MA (on my way to celebrate my mother's 86th!), and braved the cold to snap a few photos. It was crazily windy and bitterly cold and extremely bright. My shots were extremely over exposed, even after I cranked the exposure compensation way down. My amateur guess was that it was just too cold for the camera and the shutter was slow.

Information and advice would be gratefully appreciated.

JVA

03-19-2015, 03:06 PM   #2
Pentaxian
JinDesu's Avatar

Join Date: Jun 2011
Location: New York City
Photos: Gallery
Posts: 5,624
Please post some pictures with exif intact for reference. What lens was used? What temps? Perhaps the lens was just not stopping down fully due to the cold affectinf the aperture oils?
03-19-2015, 03:11 PM   #3
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,288
QuoteOriginally posted by jva59 Quote
My amateur guess was that it was just too cold for the camera and the shutter was slow.
More likely a lens problem. Aperture blades might be sticking. Try it again in warm conditions and see if it works now.
03-19-2015, 03:11 PM   #4
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,959
QuoteOriginally posted by jva59 Quote
Dear Fellow Pentaxians.

I'm hoping you can set my anxieties to rest, or tell me what i need to do if there is a problem. I stopped in Boston MA (on my way to celebrate my mother's 86th!), and braved the cold to snap a few photos. It was crazily windy and bitterly cold and extremely bright. My shots were extremely over exposed, even after I cranked the exposure compensation way down. My amateur guess was that it was just too cold for the camera and the shutter was slow.

Information and advice would be gratefully appreciated.

JVA
If it was below the specified operating temp (-10C / 14F), then it's possible that the shutter and/or lens diaphragm wasn't operating properly, especially if you weren't using a WR lens.


Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

03-19-2015, 03:11 PM   #5
Site Supporter




Join Date: Sep 2010
Location: Omaha
Photos: Gallery
Posts: 236
My bet is that the aperture blades in your lens have a small amount of oil on them, which is increasing in viscosity under colder temperature conditions and hampering the ability of the lens to stop down during exposure. This would let in more light than the camera is expecting, resulting in overexposure. My theory is that under more normal/warmer temperatures, the oil problem isn't yet significant enough to noticeably hamper the lens performance.
03-19-2015, 03:12 PM   #6
Loyal Site Supporter
narual's Avatar

Join Date: Jun 2013
Location: South Bend (Notre Dame), Indiana
Posts: 1,935
Did you have the flash on and get trapped at 1/180th of a second shutter speed?
03-19-2015, 03:25 PM   #7
Pentaxian
VisualDarkness's Avatar

Join Date: Nov 2011
Location: Uppsala, Sweden
Photos: Gallery
Posts: 4,439
I also guess a dirty aperture in the lens as that is the exact behavior of one in cold weather. I've never had a Pentax DSLR body facing trouble in cold like that.
03-19-2015, 04:04 PM   #8
Pentaxian
Sagitta's Avatar

Join Date: Feb 2011
Location: Maine
Photos: Gallery
Posts: 2,912
My Samyang 85mm won't work in cold temps - the blades start sticking due to the cold (if I swap lenses, the other lens works fine under the same conditions). I'm guessing its a lens problem like I have.

03-19-2015, 04:49 PM   #9
Loyal Site Supporter




Join Date: Aug 2010
Location: Toronto
Posts: 2,004
Original Poster
Thanks, guys. It is an old A series lens. It occurred to me that stopping down might be the issue after posting. I let the camera warm up and tried a few tests. Much better.
03-24-2015, 12:54 PM   #10
Loyal Site Supporter
TER-OR's Avatar

Join Date: Apr 2009
Location: Dundee, IL
Photos: Gallery | Albums
Posts: 5,416
Yeah, I've been out in some VERY cold weather -10F for good periods and it's always the battery which gives out first. I just swap with one from a pocket. The lens hasn't been a problem, but I'm using the 18-135 most of the time in that weather. I can see the A series getting a bit sluggish, if that lubrication starts to gel.
03-29-2015, 01:00 PM   #11
Loyal Site Supporter




Join Date: Aug 2010
Location: Toronto
Posts: 2,004
Original Poster
Problem returned at higher temperatures, and I did the obvious thing: tried another lens (as traveling and only had one to hand) which worked fine. The problem lens was still under warranty from KEH, to which I've returned it.
03-29-2015, 01:10 PM   #12
Site Supporter




Join Date: May 2014
Location: Minnesota
Posts: 1,182
I had the same problem with my K-5IIs with certain lenses like the 20-40mm f2.8-4 . Seems like the shutter gets stuck under extreme cold situations. What I do is turn the Mode Dial to a different setting for example from "P" to "AV" and the problem goes away.
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, k-5, k-5 ii, k-5 iis, k5, k5 ii, pentax k-5
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Buy K3 or K5 II's? ALiEN|PoV Pentax K-3 25 03-20-2014 05:02 AM
For Sale - Sold: Katzeye with Optibrite (K-7, K5, K5 II(S), K30, K50, K500) robbiec Sold Items 4 11-14-2013 06:34 PM
K5 II (s) or hold out... Brandonsarkis Pentax K-5 20 06-26-2013 08:15 PM
Pentax K5 II/s in Alberta Dr_who Pentax K-5 3 11-15-2012 08:56 PM
Shooting in extreme cold climit Pentax DSLR Discussion 12 01-19-2011 08:21 AM



All times are GMT -7. The time now is 12:25 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