Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-15-2010, 06:39 PM   #1
Forum Member




Join Date: Apr 2010
Posts: 68
Dynamic Range on the K-x

Hi,

I've been pretty impressed with some of the sample images of the K-x. To my eye it seems like it's got a really good dynamic range.

I wonder if anyone know how it compares with other entry level DSLRs and also the kings of dynamic range like the Nikon D700 or traditionally the Fuji S5 pro?

04-15-2010, 07:01 PM   #2
Veteran Member
jct us101's Avatar

Join Date: Jun 2008
Location: Rohnert Park, CA
Posts: 3,695
The Fuji S5 pro isn't a traditional camera, it uses a Super CCD that allows for it to have twice as much dynamic range as anything else in the competition. There's also not really a good comparison between it and the Nikon D700 since that has a full frame sensor which is going to have more dynamic range due to the sensor size. If you want to check comparisons, I'd recommend going to places like DPreview and DCresource and checking their comparisons against cameras like the Canon 550D (T2i) and the Nikon D5000 and then see what you think of their comparisons (they'll usually put at least one dynamic range comparison in there).

But, there isn't really a kind of dynamic range page where you can check different cameras against each other if that is really what you are asking here. The K-x has pretty good dynamic range as far as I'm concerned though.
04-15-2010, 07:13 PM   #3
Forum Member




Join Date: Apr 2010
Posts: 68
Original Poster
Well, when I meant traditional, I sort of meant it as a benchmark for DR. Some of the detail that thing could capture was pretty damn awesome. It sucks that Fuji hasn't come up with a replacement for it since, nor have they even tried entering the compact DSLR market.
04-15-2010, 08:44 PM   #4
New Member




Join Date: Apr 2010
Location: California
Posts: 6
thinking of a k-x

I've been using a 35mm Minolta SLR for about 8 years. I really like it and I've sort of been clinging to film. But I think it's time for me to add a digital SLR to my photo life. Would you recommend the K-X for someone who likes to do hobby based photography and is also new to digital photography? I want something that produces really nice shots, but I don't want it to be so complicated that I can't use it to it's full potential. I've been doing a lot of research on this and people seem to say that this camera is better than the Nikon D3000 so I'm leaning this way. Any thoughts?

04-15-2010, 09:22 PM   #5
Junior Member
Marv Toler's Avatar

Join Date: Jan 2010
Location: Okemos, MI
Posts: 29
Speaking just for myself, I think that the K-x would be a good choice for you. The K-x is about as easy to use as any good quality digital camera. You can go full auto or full manual with tons of variations in between. You can take some great shots in auto while experimenting and learning new features as your comfort level increases. I've had 2 older Minolta SLRs (SRT-101 and X-370) and I recently bought a Pentax K-x. For me, it was a great decision.
04-15-2010, 11:34 PM   #6
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,893
QuoteOriginally posted by Shahmatt Quote
..I wonder if anyone know how it compares with other entry level DSLRs and also the kings of dynamic range like the Nikon D700 or traditionally the Fuji S5 pro?
The short answer:



ie the K-x has the best dynamic range of any current APS-C DSLR. It's dynamic range (12.5) even exceeds that of the D700 (12.2). The actual 'king' of dynamic range nowadays is the D3X. The D700 is something of a laggard in fact.

The long answer:

DxOMark Sensor
04-15-2010, 11:41 PM   #7
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,893
QuoteOriginally posted by jct us101 Quote
But, there isn't really a kind of dynamic range page where you can check different cameras against each other if that is really what you are asking here.
Yes there is, and it's very useful.

DxOMark Sensor

The whole DXOMark site in general is setup to do exactly those sort of comparisons.
04-15-2010, 11:47 PM   #8
Veteran Member
jct us101's Avatar

Join Date: Jun 2008
Location: Rohnert Park, CA
Posts: 3,695
QuoteOriginally posted by rawr Quote
Yes there is, and it's very useful.

DxOMark Sensor

The whole DXOMark site in general is setup to do exactly those sort of comparisons.
I totally forgot about DXOMark, but don't worry, there is a very good reason for that.

The company (or whatever owns the website) is very biased in their testing, and they don't test real world applications when they're testing dynamic range for sensors. They said that the Canon Digital Rebel (forgot which one, I think the XT or the XTi, maybe the XSi) had more dynamic range than the 5D, which is a full frame sensor, and automatically with the increased area of the full frame sensor, has more dynamic range by nature. They also claimed that the Panasonic G1 had more dynamic range than the Nikon D700. These things just aren't possible, at least in the way that you are supposed to understand dynamic range and how it's supposed to work.

04-16-2010, 12:11 AM   #9
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,893
QuoteOriginally posted by jct us101 Quote
I totally forgot about DXOMark, but don't worry, there is a very good reason for that.
Many people and reviewers find the DXOMark metrics entirely credible.

The examples you cite are wrong: according to DXOMark, the D700 scores 12.2 on dynamic range, the GH1 only scores 11.6, and the G1 a mere 10.3.

And I don't believe the sensor size (eg full-frame, APS-C etc) alone is what counts for achieving a good dynamic range. It is more technically complicated than that, I think.

Last edited by rawr; 04-16-2010 at 12:15 AM. Reason: fixed up GH1/G1 numbers
04-16-2010, 12:31 AM   #10
Veteran Member




Join Date: Mar 2009
Location: Perth Australia
Photos: Albums
Posts: 1,512
Dynamic range of the Kx is nothing short of incredible.

Its up there with the medium format cameras.

DxOMark Sensor

its number 10 in the world actually.
04-16-2010, 12:34 AM   #11
Forum Member




Join Date: Apr 2010
Posts: 68
Original Poster
@rawr

Thanks for the information. I've looked at the site.

I find it interesting that the K20D actually has a lower DR compared with the K10D. The K7 is only 10.6 which is way lower than the immediate competition (do real world comments reflect this?). The K-x at 12.6 is pretty darn astonishing actually.
04-16-2010, 01:14 AM   #12
Veteran Member
jct us101's Avatar

Join Date: Jun 2008
Location: Rohnert Park, CA
Posts: 3,695
QuoteOriginally posted by rawr Quote
Many people and reviewers find the DXOMark metrics entirely credible.

The examples you cite are wrong: according to DXOMark, the D700 scores 12.2 on dynamic range, the GH1 only scores 11.6, and the G1 a mere 10.3.

And I don't believe the sensor size (eg full-frame, APS-C etc) alone is what counts for achieving a good dynamic range. It is more technically complicated than that, I think.
There was a huge critisism done not that long ago on them, I wouldn't be suprised if the scores were changed now because of it, but what I said before is entirely true. Look around for it, I wish I could remember what website it was on (maybe Photography-on-the.net?) but some of the tests were totally ridiculous and biased towards different cameras.
04-16-2010, 02:27 AM   #13
Veteran Member




Join Date: Jul 2008
Location: Var, South of France
Photos: Albums
Posts: 1,071
I have both (K7 and Kx), and it's something that I noticed, without really investigating further.
Seeing the DXOMark results, I'll try some informal tests of my own...

The K7 indeed already felt "narrower" than the K10, so compared to the low-noise Kx, it's not really surprising...
But it simply beats the Kx in every other aspects. So, it's more a matter of the right tool at the right moment (but if only Pentax had put the Kx sensor in the K7, that would be another story!)
04-16-2010, 06:40 AM   #14
Pentaxian
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Posts: 10,188
Something the measurebeators won't tell you is how absolutely meaningless dynamic range is once you get past 7 or so stops.
Very few scenes will take more than 6 or 7 stops of DR, so any camera that hits more than about 9 stops (I'm pretty sure that is all of them), has ample DR, and any additional headroom, while it looks good on the spec sheet, is wasted.
04-16-2010, 07:05 AM - 1 Like   #15
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
QuoteOriginally posted by Wheatfield Quote
Something the measurebeators won't tell you is how absolutely meaningless dynamic range is once you get past 7 or so stops.
Very few scenes will take more than 6 or 7 stops of DR, so any camera that hits more than about 9 stops (I'm pretty sure that is all of them), has ample DR, and any additional headroom, while it looks good on the spec sheet, is wasted.
How true.

Just for every one's information, I did a test with my *istD where I ran 2 series of exposures with a lens (my smc-m 100F4 macro) using a uniformly lit concrete wall. The first set started at F32 and what the green button metering set as normal exposure (the result was a grey scale at about 120) I then left the shutter speed constant and opened the lens up 1 aperture click at a time, and took a shot.
I repeated the tests with the lens wide open, set exposure with the green button, (again about 120 greyscale value) and then stopped down one click at a time.

What I found was that if you potted greyscale vs stops, you could detect about 5 stops between 25 and 225 grey scale linearly spaced at about 40 greyscale/stop, and about 2 1/2 stops either side, of this range but no longer linearly varying, the first was about 17 greyscale the second was about 7 and the remaining 1/2 stop was 1-2.

The only difference between RAW and JPEG was raw had more data in the high end of the exposure, but what it demonstrates is that there is at least 10 stops of dynamic range within the sensor, with 7-8 stops that have reasonably good resolution within the stop, and 2-3 stops where there is some resolution of detail at the extremes.

That was 6 years ago.

I have not tried since, because as you say, every camera has the ability to record most scenes fairly well because the dynamic range of most scenes is well within the really good resolution 7-8 EV dynamic range in the middle of the curve
The
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-x, photography, range
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
dynamic range K20D dafiryde Pentax DSLR Discussion 4 01-08-2009 10:51 AM
Dynamic Range Rene` Pentax DSLR Discussion 6 09-25-2008 07:46 AM
better dynamic range (?) needed FHPhotographer Photo Critique 12 09-11-2008 01:52 PM
Dynamic Range Vlad Photographic Technique 5 06-01-2008 10:40 PM
High Dynamic Range - How do you do it? MShawn63 Photographic Technique 32 01-11-2008 05:44 AM



All times are GMT -7. The time now is 10:38 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