PIX 2015
bclaff

bclaff

Lives in United States Vancouver, WA, United States
Joined on Nov 4, 2006

Comments

Total: 2, showing: 1 – 2
On Sony Alpha 7R II: Real-world ISO invariance study article (325 comments in total)
In reply to:

Pandimonium: Wonders why the ISO 800 shot looks cleaner than the ISO 100. Also, why does Sony persist in getting crucial stuff wrong (like raw compression).

@Azimuth46
There is a different conversion gain inside the pixel at ISO 100 and ISO 640; but at ISO 32000 there is signal processing (noise reduction) and that falsely looks like improved noise.

Direct link | Posted on Aug 24, 2015 at 18:43 UTC
On Sony Alpha 7R II: Real-world ISO invariance study article (325 comments in total)
In reply to:

Pandimonium: Wonders why the ISO 800 shot looks cleaner than the ISO 100. Also, why does Sony persist in getting crucial stuff wrong (like raw compression).

Yes, there are essentially two ISO-invariant ranges; one starts at ISO 100 and the other at ISO 640 (some signal processing kicks in at ISO 32000). See:
http://photonstophotos.net/Charts/RN_e.htm#Sony%20ILCE-7RM2_14

Direct link | Posted on Aug 24, 2015 at 16:09 UTC
Total: 2, showing: 1 – 2