the last word

Photography meets digital computer technology. Photography wins -- most of the time.

  • site home
  • blog home
  • galleries
  • contact
  • underwater
  • the bleeding edge
You are here: Home / The Last Word / Sony a7RII FW 2.0 raw dark-field histograms, ISO 3200 and up

Sony a7RII FW 2.0 raw dark-field histograms, ISO 3200 and up

November 21, 2015 JimK 2 Comments

A few days ago I posted dark-field histograms from uncompressed files made with version 2 firmware running on the Sony a7II. Yesterday, I posted compressed and uncompressed read noise and engineering dynamic range plots for the a7RII running version 2 firmware.

Today’s post is of dark-field histograms from the a7RII, both compressed and uncompressed. The low-ISO ones are unsurprising and were posted earlier. Now I’m posted the higher-ISO ones.

ISO 1600 uncompressed. 14 bits present. A couple of dropouts.
ISO 3200 uncompressed. 14 bits present. A couple of dropouts.
ISO 1600 compressed. 13 bits present. A couple of dropouts.
ISO 3200 compressed. 13 bits present. One dropout.
ISO 6400 uncompressed. 15 bits present. A couple of dropouts.
ISO 6400 uncompressed. 14 bits present. A couple of dropouts.
ISO 10000 uncompressed. 14 bits present. A couple of dropouts.
ISO 10000 uncompressed. 14 bits present. A couple more dropouts.
ISO 12800 uncompressed. 14 bits present. A couple of dropouts.
ISO 12800 uncompressed. 14 bits present. Lots of dropouts. Digital gain?
ISO 12800 compressed. Dropouts and combing.
ISO 12800 compressed. Dropouts and combing.
ISO 16000 uncompressed. Lots of dropouts.
ISO 16000 uncompressed. Lots of dropouts and combing.
ISO 16000 compressed. Lots of dropouts.
ISO 16000 compressed. Lots of dropouts. Some combing.
ISO 20000 uncompressed. Lots of dropouts.
ISO 20000 uncompressed. Lots of dropouts. No combing.
ISO 16000 uncompressed. Lots of dropouts.ISO 16000 compressed. Lots of dropouts.
ISO 20000 uncompressed. Lots of dropouts. A bit of combing.
ISO 25600 uncompressed. Lots of dropouts.
ISO 25600 uncompressed. Lots of dropouts.
ISO 25600 compressed. Lots of dropouts.
ISO 25600 compressed. Lots of dropouts. Lots of combing.

Now we get to the ISOs where Sony does digital noise reduction.

ISO 32000 uncompressed. Most of the dropouts are filled in.
ISO 32000 uncompressed. Most of the dropouts are filled in.
ISO 32000 uncompressed. Again, most of the dropouts from 13 bits are filled in.
ISO 32000 uncompressed. Again, most of the dropouts from 13 bits are filled in.
ISO 40000 uncompressed. Most of the dropouts are filled in.
ISO 40000 uncompressed. Most of the dropouts are filled in.
ISO 40000 uncompressed. Again, most of the dropouts from 13 bits are filled in.
ISO 40000 compressed. Again, most of the dropouts from 13 bits are filled in.
ISO 51200 uncompressed. Most of the dropouts are filled in.
ISO 51200 uncompressed. Most of the dropouts are filled in, but there are a lot more than at ISO 40000.
ISO 51200 compressed. Again, most of the dropouts from 13 bits are filled in.
ISO 51200 compressed. Again, most of the dropouts from 13 bits are filled in.

Unless there is interest in the nosebleed ISO, I think I’ll stop here.

The departures from ideality, while interesting, will have no effect on normal photography, since there is plenty of read noise dither.

 

The Last Word

← Sony a7RII FW 2.0 raw dark-field histograms, ISO 100-1600 Sony a7RII FW 2.0 raw dark-field mean values vs ISO →

Comments

  1. Jack Hogan says

    November 22, 2015 at 2:03 am

    Uncompressed: there appears to be one level missing every 26, which would suggest digital scaling post ADC by about (1+1/26). Below ISO10000 it’s probably just compensating for slightly lower analog gain. Above ISO 10000 there is some other digital scaling before x (1+1/26) is applied. This additional factor seems to get back in sync at ISO40000. With a bit of thinking one could figure out what it is.

    The interesting implication of this digital scaling is that the Black Level should shift with ISO. Does it? 🙂

    Reply

Trackbacks

  1. Sony a7RII FW 2.0 raw dark-field mean values vs ISO | The Last Word says:
    November 22, 2015 at 9:50 am

    […] Hogan, in a comment to an earlier post on the rms noise values of uncompressed and compressed Sony a7rII dark-field […]

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

January 2023
S M T W T F S
1234567
891011121314
15161718192021
22232425262728
293031  
« Dec    

Articles

  • About
    • Patents and papers about color
    • Who am I?
  • Good 35-70 MF lens
  • How to…
    • Backing up photographic images
    • How to change email providers
  • Lens screening testing
    • Equipment and Software
    • Examples
      • Bad and OK 200-600 at 600
      • Excellent 180-400 zoom
      • Fair 14-30mm zoom
      • Good 100-200 mm MF zoom
      • Good 100-400 zoom
      • Good 100mm lens on P1 P45+
      • Good 120mm MF lens
      • Good 18mm FF lens
      • Good 24-105 mm FF lens
      • Good 24-70 FF zoom
      • Good 35 mm FF lens
      • Good 60 mm lens on IQ3-100
      • Good 63 mm MF lens
      • Good 65 mm FF lens
      • Good 85 mm FF lens
      • Good and bad 25mm FF lenses
      • Good zoom at 24 mm
      • Marginal 18mm lens
      • Marginal 35mm FF lens
      • Mildly problematic 55 mm FF lens
      • OK 16-35mm zoom
      • OK 60mm lens on P1 P45+
      • OK Sony 600mm f/4
      • Pretty good 16-35 FF zoom
      • Pretty good 90mm FF lens
      • Problematic 400 mm FF lens
      • Tilted 20 mm f/1.8 FF lens
      • Tilted 30 mm MF lens
      • Tilted 50 mm FF lens
      • Two 15mm FF lenses
    • Found a problem – now what?
    • Goals for this test
    • Minimum target distances
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Printable Siemens Star targets
    • Target size on sensor
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Test instructions — postproduction
    • Test instructions — reading the images
    • Test instructions – capture
    • Theory of the test
    • What’s wrong with conventional lens screening?
  • Previsualization heresy
  • Privacy Policy
  • Recommended photographic web sites
  • Using in-camera histograms for ETTR
    • Acknowledgments
    • Why ETTR?
    • Normal in-camera histograms
    • Image processing for in-camera histograms
    • Making the in-camera histogram closely represent the raw histogram
    • Shortcuts to UniWB
    • Preparing for monitor-based UniWB
    • A one-step UniWB procedure
    • The math behind the one-step method
    • Iteration using Newton’s Method

Category List

Recent Comments

  • JimK on Picking a macro lens
  • JimK on Picking a macro lens
  • Glenn Whorrall on Picking a macro lens
  • JimK on What pitch do you need to scan 6×6 TMax 100?
  • Hatzipavlis Peter on What pitch do you need to scan 6×6 TMax 100?
  • JeyB on Internal focusing 100ish macro lenses
  • JimK on How focus-bracketing systems work
  • Garry George on How focus-bracketing systems work
  • Rhonald on Format size and image quality
  • JimK on Internal focusing 100ish macro lenses

Archives

Copyright © 2023 · Daily Dish Pro On Genesis Framework · WordPress · Log in

Unless otherwise noted, all images copyright Jim Kasson.