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

Panasonic DC-G9 Photographic Dynamic Range (PDR) at PhotonsToPhotos

Started Jul 14, 2018 | Discussions thread
Iliah Borg Forum Pro • Posts: 29,482
Re: Panasonic DC-G9 Photographic Dynamic Range (PDR) at PhotonsToPhotos
4

jrsforums wrote:

Iliah Borg wrote:

SHood wrote:

Very Interesting low ISO results. I wonder if ISO100 is the actual base ISO.

http://www.photonstophotos.net/Charts/PDR.htm#Olympus%20OM-D%20E-M1%20Mark%20II,Panasonic%20Lumix%20DC-G9

For DC-9, ISO 100 is a setting here the raw data is linear only up to 2111. The rest is "shoulder", covering approximately 1 stop.

Iliah, I am sure you and Bill understand your statement. Could you explain for us mere mortals

Sorry, I'm a mere mortal too, and can't read minds and predict what my peers know

"Shoulder" - non-linear part of characteristic curve, located in highlights; similar to the extreme top of the film H&D curve right before the solarization (sometimes called Sabatier effect). The upper portion of the curve is progressively more and more parallel to x-axis.

Raw data is linear (normal for raw) up to 2111 (instead of usual 4095 for ISO 200 and up), and after 2111 linearity starts to decline. This happens because the upper, non-linear portion of the sensor response is used (full well capacity is not clipped at linearity maximum).

This is possible when the gain for ISO 100 is lower (approx. 2x lower) than for ISO 200, thus enabling a gentler roll-off of the highlights for the price of colour accuracy. I would be very careful when using this upper portion while shooting raw - full ETTR at such ISO speed settings may result in rather ugly highlights.

If something is still unclear, please ask.

-- hide signature --
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow