Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-22-2013, 09:07 AM   #1
Junior Member




Join Date: Jan 2013
Posts: 27
Dynamic Range of Pentax 16 mp sensor

I've been around long enough to have learned and used Ansel Adams Zone System. The dynamic range of most B&W film was about 9 f-stops, from pure white to pure black. I have a old Zone VI modified Pentax 1 degree spot meter with the zones labeled on it. I have done some research but cannot find the dynamic range of the sensor in my K30 or for a modern CMOS sensor. I found it as being 60-70 db but that means nothing to me. Does anyone know in terms of f-stops the dynamic range of the 16mp sensor Pentax uses? Restated, at a given f-stop and shutter speed how many stops down to pure black and how many up to pure white?

Thanks

01-22-2013, 09:18 AM   #2
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
It depends on the iso and format you shoot but in RAW at the lowest ISO it would be about 13 Evs of dynamic range captured.
01-22-2013, 09:28 AM   #3
Pentaxian
panoguy's Avatar

Join Date: Sep 2007
Location: Washington, D.C.
Photos: Gallery | Albums
Posts: 3,316
DXO did the measuring for you, but as Anvh points out above, this is under ideal conditions (and shooting in RAW format and post-processing it yourself):

DxOMark - Pentax K-30
01-22-2013, 09:53 AM   #4
dms
Site Supporter
Site Supporter




Join Date: Aug 2011
Location: New York, NY
Photos: Gallery
Posts: 2,133
DXOMark values do not fit directly into zone system as there is usually considerably wide range below zone 5 than above--likely best if you take a gray card and take a range of exposures to find out for yourself and then rerate the speed/apply ev adjust. (Amazing what you can do with almost instant feedback of digital. _

01-22-2013, 09:58 AM   #5
Junior Member




Join Date: Jan 2013
Posts: 27
Original Poster
QuoteOriginally posted by Anvh Quote
It depends on the iso and format you shoot but in RAW at the lowest ISO it would be about 13 Evs of dynamic range captured.
My interest is landscape - camera on the tripod with lots of opportunity to fiddle with settings, so low ISO and raw is usually a given. Thanks for the info.
01-22-2013, 10:02 AM   #6
Veteran Member




Join Date: Jan 2010
Location: Michigan
Photos: Gallery
Posts: 2,207
On the output monitor, if sRGB, we have a range of 8 EV on each of the 3 channels.
View the complete color range for rgb() integer values
01-22-2013, 10:51 AM   #7
Loyal Site Supporter
Loyal Site Supporter
foto guy's Avatar

Join Date: Apr 2008
Location: Vernon, Connecticut
Photos: Gallery | Albums
Posts: 286
Keep in mind the DR of the sensor will likely differ from that of a given monitor, as well as printed on paper.

01-22-2013, 10:56 AM   #8
Veteran Member
carrrlangas's Avatar

Join Date: Mar 2012
Location: Joensuu (Finland)
Photos: Gallery
Posts: 1,761
QuoteOriginally posted by Anvh Quote
It depends on the iso and format you shoot but in RAW at the lowest ISO it would be about 13 Evs of dynamic range captured.
Hi Anvh. Yo seem to know a lot about this. I tried to follow this on ther threads but everyvody talks about it as a "given" (is it said like that in english?).
How do you get to play with this 13Ev? Be it on LR or PS, how exactly do you get the 13Ev on a single picture? Layers and adjusting different exposure values for each? does 13Ev means you can change exposure with acceptable noise levels increase?

thanks,
Francisco
01-22-2013, 11:28 AM   #9
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
There are few kinks in the cable of course.

The problem is that sensor is a linear (like) capturing device so that means the darker the part gets in the image the less information there will be captured. (this answer your noise question)
So of those 13 EVs captured not everything is useful.
Then there is the format it's displayed on, most monitors give you about 9 to 10 EVs and paper is about 6 to 7 EVs

As for the adjustments.
You need to play with the curves or the exposure settings like highlight adjustments, blacks and contrast.
But you're always playing with it really.


bit about ETTR that shows you a bit about what the linear information capturing i mean.
http://schewephoto.com/ETTR/index.html



If you like HDR you can look on google for pseudo HDR, that's HDR made from 1 image.
http://layersmagazine.com/hdr-in-lightroom.html

Last edited by Anvh; 01-22-2013 at 11:45 AM.
01-22-2013, 01:21 PM   #10
Veteran Member
Na Horuk's Avatar

Join Date: Feb 2012
Location: Slovenia, probably
Photos: Gallery | Albums
Posts: 11,183
Film and digital are quite different mediums. Another problem is that different softwares will interpret your raw files differently. They handle noise and other settings differently from each other.
There are also techniques like "HDR" and tonemapping that you can use to get more data to play with or to at least give the appearance. Good luck
01-22-2013, 02:21 PM   #11
Pentaxian




Join Date: Jul 2010
Location: Oregon
Photos: Albums
Posts: 1,429
Post-production allows us to adjust the 14-stop image to fit the dynamic range of a monitor or print. This is not so different from developing and printing a B+W negative to preserve shadow and highlight detail. It's just dry and less stinky. Adams would be shooting digital today.
01-22-2013, 04:20 PM   #12
Junior Member




Join Date: Jan 2013
Posts: 27
Original Poster
That is the final detail I needed to hear.
Thanks to everyone who helped me with my question.
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, f-stops, pentax, photography, range, range of pentax, sensor, zone
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
DPReviews dynamic range tests of K-30 are available Docrwm Pentax K-30 & K-50 7 09-08-2012 04:23 AM
The Effect of Lens Flare/Glare on Dynamic Range dosdan Photographic Technique 5 10-15-2011 10:25 AM
Sony's new 16.1 MP EXMOR sensor tsammyc Non-Pentax: Canon, Nikon, Sony, etc. 11 09-20-2011 12:41 AM
Pentax k5 dynamic range challenge. ffureel Pentax K-5 & K-5 II 15 05-09-2011 02:11 PM
Dynamic Range of K7 & Kx Sensor? seachunk2 Troubleshooting and Beginner Help 2 08-31-2010 05:47 PM



All times are GMT -7. The time now is 11:23 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