Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-11-2013, 07:47 AM   #1
Veteran Member




Join Date: Nov 2009
Location: Iowa
Photos: Albums
Posts: 2,269
Clipped highlights on the Q.

Hey all.

Every once in awhile I notice clipped highlights in photos from the Q, even on properly exposed shots. Take a look at these:

First, one from the Q:



Look at the pickguard on the guitar. It's a "pearloid" pickguard, made of an iridescent white plastic. See the clipped highlights?

Now look at a pic of the same show taken with a K-x:



No weirdness going on in the pickguard. It also occasionally pops up on photos of flowers taken in bright light. Though the exposure is correct, in the areas where it should be gradients of light colors and white, it's just a blob of white.

Is there a setting in the camera, perhaps the highlight correction or something that would fix this occasional annoyance? It doesn't happen often, but I'd rather it didn't happen at all.

P.S. - I know the white balance is a bit wonky on the pic taken with the Q, (stage lights will do that) but I didn't take time to fix it yet.


Last edited by GibbyTheMole; 06-11-2013 at 07:57 AM.
06-11-2013, 07:56 AM   #2
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,873
not the same angle of shot.. so it is difficult to tell IMHO.
06-11-2013, 08:01 AM   #3
Veteran Member




Join Date: Nov 2009
Location: Iowa
Photos: Albums
Posts: 2,269
Original Poster
QuoteOriginally posted by aleonx3 Quote
not the same angle of shot.. so it is difficult to tell IMHO.
It's awfully close. I had the K-x & my wife was right next to me with the Q.
06-11-2013, 08:08 AM   #4
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,873
A slightly angle could make a big difference, for example, try using a flash on a subject with glass window in the background. The light reflection could be hitting on the Q but not the k-x.

06-11-2013, 08:12 AM   #5
Site Supporter
enoeske's Avatar

Join Date: Jul 2009
Location: Surprise, Az
Photos: Gallery
Posts: 1,888
What kind of settings are you using on the Q? I ask because it looks like really low quality. The shadow gradients are completely posterized. I looks like its set to 1 or 2 * quality. If you don't have anything set weird in the settings, try doing a factory reset on it and see if that clears anything up.
06-11-2013, 08:22 AM   #6
Veteran Member




Join Date: Nov 2009
Location: Iowa
Photos: Albums
Posts: 2,269
Original Poster
QuoteOriginally posted by enoeske Quote
What kind of settings are you using on the Q? I ask because it looks like really low quality.
Quality's all the way up & JPEG.
06-11-2013, 08:23 AM   #7
Site Supporter
enoeske's Avatar

Join Date: Jul 2009
Location: Surprise, Az
Photos: Gallery
Posts: 1,888
QuoteOriginally posted by GibbyTheMole Quote
Quality's all the way up & JPEG.
what picture mode are you using? what digital filters? Any exif info?
06-11-2013, 08:37 AM   #8
Veteran Member




Join Date: Nov 2009
Location: Iowa
Photos: Albums
Posts: 2,269
Original Poster
Since it's a cut & paste from my facebook pic URL, so no exif info, but I can tell you the settings:

02 zoom
manual exposure mode
ISO 1600
f:4.5
Shutter speed approx. 1/125 sec.
JPEG
Max quality (12MP)
No digital filters
"Natural" picture quality

06-11-2013, 08:40 AM   #9
Pentaxian




Join Date: Jul 2009
Location: Seattle
Posts: 6,930
The Q has a small sensor with poor dynamic range compared to larger sensors. You will clip highlights when the amount of light exceeds its capability such as light glaring off shiny surfaces. You can under expose and pull up the shadows on the RAW file to get more DR than the JPEG engine typically gives you.
06-11-2013, 08:40 AM   #10
Site Supporter
enoeske's Avatar

Join Date: Jul 2009
Location: Surprise, Az
Photos: Gallery
Posts: 1,888
QuoteOriginally posted by GibbyTheMole Quote
Since it's a cut & paste from my facebook pic URL, so no exif info, but I can tell you the settings:

02 zoom
manual exposure mode
ISO 1600
f:4.5
Shutter speed approx. 1/125 sec.
JPEG
Max quality (12MP)
No digital filters
"Natural" picture quality
just to check one more thing

12MP and jpeg quality are 2 different things -- do you have all three stars in the info menu (bottom right)
06-11-2013, 08:53 AM   #11
Veteran Member




Join Date: Nov 2009
Location: Iowa
Photos: Albums
Posts: 2,269
Original Poster
QuoteOriginally posted by enoeske Quote
12MP and jpeg quality are 2 different things -- do you have all three stars in the info menu (bottom right)
I'm pretty sure it's at 3 stars & 12 MP, unless my wife changed the settings accidentally. (doubt she did, though.) The above photo was taken with her Q, and I have noticed occasional clipped highlights on my Q as well, and I know the quality is at it's max settings on my Q. I never change those.
06-11-2013, 09:00 AM   #12
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,984
QuoteOriginally posted by GibbyTheMole Quote
I'm pretty sure it's at 3 stars & 12 MP, unless my wife changed the settings accidentally. (doubt she did, though.) The above photo was taken with her Q, and I have noticed occasional clipped highlights on my Q as well, and I know the quality is at it's max settings on my Q. I never change those.
Sounds like the high ISO is to blame. You should try to avoid setting the ISO too high, as the IQ degrades very quickly.

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:

06-11-2013, 09:19 AM   #13
Veteran Member




Join Date: Nov 2009
Location: Iowa
Photos: Albums
Posts: 2,269
Original Poster
QuoteOriginally posted by enoeske Quote
12MP and jpeg quality are 2 different things -- do you have all three stars in the info menu (bottom right)
Yep... Just checked.

QuoteOriginally posted by Adam Quote
Sounds like the high ISO is to blame. You should try to avoid setting the ISO too high, as the IQ degrades very quickly.
It was a concert at night, so a high ISO was necessary to reasonably capture the action. I did think of that possibility, though.
06-11-2013, 09:27 AM   #14
Forum Member




Join Date: Feb 2013
Posts: 64
At higher ISO I find it's better to underexpose a stop or so and post process the RAW in lightroom in order to aboid blowing the highlights. The main issue with the Q at high ISO for me is the color accuracy, and you can do much much better processing outside the camera for that.
06-11-2013, 09:46 AM   #15
Pentaxian




Join Date: Oct 2006
Location: Chicago suburb, IL, USA
Posts: 1,535
Hi Gibby,

I agree with tuco here. I think the difference is DR capability of the sensor. There is apparently about a 1.4 stop difference (11.1 Ev compared to 12.5 Ev with the Kx) in DR between the Q and the Kx sensors and this makes the Q more difficult to meter. I often shoot a K-5 or K-5IIs and a Q together (where there's about a 3 stop difference in DR between the sensors) and have to be much more conservative with the Q to prevent blowing highlights. It's an adjustment that has to be considered when using the much smaller sensor with scenes with high DR.

That being said, I think that the Q did pretty well here at ISO 1600 in jpeg. I'd consider shooting RAW with the Q in these situations since you'd get a bit more headroom from the 12 bit RAW files than the 8 bit jpegs can give you.

Scott
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, light, look, mirrorless, pentax q, pentax q10, pentax q7, photos, pic, q10, q7
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Adapted lenses tested on the Q : the reference thread crewl1 Pentax Q 1054 11-06-2016 09:22 PM
How are the Auto 110 lenses on the Q? ChopperCharles Pentax Q 37 05-20-2013 09:47 PM
Ideas on diffusing the onboard flash of the Q? Tonto Pentax Q 28 05-19-2013 11:46 AM
Help me pull the trigger on the Q Turbo Elephant Pentax Q 57 10-25-2012 06:06 PM
K5 & blowing out the highlights BLW44 Pentax K-5 29 10-10-2011 03:10 AM



All times are GMT -7. The time now is 02:49 AM. | 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