DPReview.com is closing April 10th - Find out more

SDQ Dynamic Range

Started Jul 21, 2017 | Discussions thread
xpatUSA
xpatUSA Forum Pro • Posts: 23,017
Re: SDQ Dynamic Range

DMillier wrote:

PrebenR wrote:

lockhrt wrote:

Hmm. That is almost half of what I am used to.

That is not correct. According to DxOMark K5 has a max if 10.5 PDR. K-1 has 11.30.

Where did you get that DXOMark score for the K5?

This page https://www.dxomark.com/Cameras/Pentax/K5---Measurements seems to indicate 14 stops DR (using their system). I don't know what that translates to in real world use at acceptable shadow noise levels. DR seems to be one of those specifications where you can score almost anything depending on how the measurement is done.

There is an ISO 15739 standard for the measurement of digital camera DR. The well-respected Doug Kerr has a lot to say about it here:

http://dougkerr.net/Pumpkin/articles/ISO_Dynamic_range.pdf

It gets interesting from page 8 onwards, where he debunks the stated low level where the luminance SNR = 0dB; under that condition, two standard deviations of the normal distribution (+/- 3 sd) are actually negativebrightness ... a black hole so to speak.

So it is these days that the low level from which DR is determined is whatever Chuck Norris says it is ...

 xpatUSA's gear list:xpatUSA's gear list
Panasonic Lumix DMC-LX1 Sigma SD9 Panasonic Lumix DC-G9 Panasonic Leica DG Macro-Elmarit 45mm F2.8 ASPH OIS Sigma 17-50mm F2.8 EX DC OS HSM +11 more
Post (hide subjects) Posted by
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow