Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-20-2009, 06:34 PM   #1
Senior Member
MoparFreak69's Avatar

Join Date: Jul 2009
Location: Boise, Idaho
Photos: Gallery
Posts: 197
High ISO bad?

I have read quite a few topics and discussions on how Pentax cameras dont do well in low light / High ISO situations. More than 1 person has stated that those "canikons" do way better in High ISO sitations and that Pentax photos taken at high ISO are pretty much unusable. I was playing around snapping a few shots off of the unwilling subject known as my dog at ISO 3200 and I didnt really seem to notice much noise at all. Sure if you zoom in to 100% you can see it is a bit grainy, but not a whole lot more than shots I have taken at even ISO 100. Am I missing something in my pictures that others see?


This is Scarlet by the way. I know the composition is not great, overal picture isnt good either I was just trying stuff and this was just a random shot chose out of the set, no PP except to shrink it to be able to upload.

07-20-2009, 06:46 PM   #2
Veteran Member
Pentaxor's Avatar

Join Date: May 2009
Location: Vancouver, B.C.
Photos: Gallery
Posts: 6,513
well, you sure do know how to use exposure properly. it is not that Pentax cameras are noisy, it's just a matter of how you deal with the noise. you don't expect that your carpet would be clean if you didn't wipe your shoes on the rug first.
07-20-2009, 06:48 PM   #3
Veteran Member
GLXLR's Avatar

Join Date: Feb 2009
Location: Sugar Land, TX
Photos: Gallery
Posts: 686
QuoteOriginally posted by MoparFreak69 Quote
I have read quite a few topics and discussions on how Pentax cameras dont do well in low light / High ISO situations. More than 1 person has stated that those "canikons" do way better in High ISO sitations and that Pentax photos taken at high ISO are pretty much unusable. I was playing around snapping a few shots off of the unwilling subject known as my dog at ISO 3200 and I didnt really seem to notice much noise at all. Sure if you zoom in to 100% you can see it is a bit grainy, but not a whole lot more than shots I have taken at even ISO 100. Am I missing something in my pictures that others see?


This is Scarlet by the way. I know the composition is not great, overal picture isnt good either I was just trying stuff and this was just a random shot chose out of the set, no PP except to shrink it to be able to upload.
That does look pretty noisy...
07-20-2009, 09:03 PM   #4
Veteran Member
krypticide's Avatar

Join Date: Dec 2007
Photos: Gallery
Posts: 1,079
Well, the issue is that Canikon cameras smear their high ISO shots so that it seems like noise is less, but at a huge cost to detail. Compare the high ISO tests of the K20D versus its competitors on DPReview, and you'll see what I mean.

I don't mind noise at high ISO, and I'm all for preserving detail, but one thing I can't stand (which I'm not sure is a problem with Canikons) is chroma noise, specifically spots or splotches of blue/purple. These tend to show up at tungsten white balances. I think I know the reason for that, but that's for another thread.

Anyway, don't believe all the hype. Even if you look at 6400 ISO shots with the D700 or 5DII, you'll see that the noise is comparable to 1600 on Pentax, but there's still a noticeable loss of detail.

07-20-2009, 09:21 PM   #5
Veteran Member




Join Date: Dec 2007
Posts: 923
OMG...the Noise...the Noise...

Just kidding....there's a bit of noise in the black (gray ?) part of fabric, to be expected, but the rest of the photo is remarkably clean.

A properly exposed shot at ISO3200 is definitely usable up to A4 print or viewing full screen on an average sized PC monitor.

The problem has been a few posters who put up badly underexposed shots, perhaps boosted up in PP so the Histogram looks good, then it looks really noisy and generally awful.
07-20-2009, 09:42 PM   #6
Veteran Member
causey's Avatar

Join Date: Feb 2009
Location: Arlington, VA
Photos: Albums
Posts: 3,758
yeah... I like being given the option of dealing with noise myself. sometimes I simply want to have more detail even with a greater amount of noise. forced smearing simply doesn't do it for me. noise can be a creative element.
07-20-2009, 09:46 PM   #7
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,695
In previous discussions, the main problem faced with high ISO noise is inadequate exposure. ETTR and the high ISO noise we all dread quickly becomes acceptable...
07-20-2009, 11:21 PM   #8
Senior Member




Join Date: Jun 2008
Location: Atlanta, Georgia
Photos: Gallery
Posts: 182
I think the "High ISO - less competitive" discussions have been triggered by the composite DxOMark, a score that in my opinion is constructed somewhat strange. To do my own assessment of the performance of K20D and some other cameras, I took RAW files from Imaging Resource for both K20D, D90 and EOS50D, and converted them with no post processing.

https://www.pentaxforums.com/forums/673340-post86.html

To me there is no big difference in the noise in these images. This is also comfirmed by looking at the SNR (signal to noise) curves in DxOMark, which are almost on top of each other (the printed/normalized version).

I think most people, when evaluating high ISO performance are looking at the noise (as demostrated in many discussions in this forum). Thus the SNR is the proper value to use, for which DxOMark do score these cameras to be very close. The composite number they have constructed, using subjectively set thresholds, IMHO is misleading.

Thus to my eyes, and verified by the SNR values, the K20D/K7 images are as competitive in low light as at least D90 and EOS50D

Best regards,
Haakan


Last edited by Haakan; 07-20-2009 at 11:29 PM.
07-21-2009, 03:13 AM   #9
Forum Member




Join Date: Feb 2009
Location: Brisbane Australia
Photos: Gallery
Posts: 82
I have K200D and K-7.

Using noise ninja, I find I had trouble clearing the noise at ISO 1600 with the K200D, without smudging the image.
I recently did some shots at ISO 4000 with the K-7, and found I could easily clean up the noise to my liking AND retain details in the image.

The noise of the K-7 is not bad at all, and has a nice film grain look to it. I like to leave a little bit behind, and keep a sharp image.
07-21-2009, 07:44 AM   #10
Veteran Member




Join Date: May 2007
Location: Prince George, BC Canada
Photos: Gallery | Albums
Posts: 644
I just shot a stage production, the rock opera Tommy, and was very impressed with the exposure and focusing of my K-7 and DA* 50-135. All shots were at 1600 ISO and wide open at f/2.8. Here are a couple of examples.



07-21-2009, 08:58 AM   #11
Veteran Member
SuperAkuma's Avatar

Join Date: Jul 2007
Location: Bay Area, CA
Photos: Gallery
Posts: 445
I think Pentax handles there high ISO pretty well. Personally I like the way Pentax handles it, it may have more "noise" but it shows more detail.

Here is a sample shot taken with my K20D. Guess which ISO it was shot at?
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, iso, pentax, photography, shots
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
People High iso is not too bad. bergwerk Post Your Photos! 5 09-19-2010 12:06 PM
What does is mean to say the K-7 is "bad" at high ISO? justtakingpics Pentax DSLR Discussion 15 05-19-2010 04:09 AM
K-7 high ISO vs K20D high ISO supa007 Pentax DSLR Discussion 72 05-10-2010 04:24 PM
K10D high iso ain't that bad?? Vaizard Pentax DSLR Discussion 4 03-02-2008 07:12 PM
Night photography with K10D - High ISO short exposure VS Low ISO long exposure pw-pix Pentax DSLR Discussion 10 02-03-2008 01:37 AM



All times are GMT -7. The time now is 10:17 PM. | 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