My Semi-Educated Guess on the Black Spot Problem

Started Dec 9, 2008 | Discussions thread
f_stops
Contributing MemberPosts: 565Gear list
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Re: There is a scientific way to solve this...
In reply to Mike Fried, Dec 10, 2008

JPG/RAW just about the same.

I did notice iso 50 produces less dots than iso 200. Raw> DPP, no sharpening or any PP.

EXIF:

Mike Fried wrote:

Cliff Chase wrote:

And so could I. However, I propose that people with the black dot
problem can test my hypothesis by shooting in RAW + JPEG and
processing the CR2 file in DPP and Photoshop and comparing results
with the camera processed JPEG. Maybe this could also be caused by
pre-processing before the demosaicing step, or it could be the result
of hardware which would explain why some people see this and others
don't (or it could be fixed in a given firmware).

-Mike

http://demosaic.blogspot.com

RAWS or full jpgs available on request

File Name MG_9716.CR2
Camera Model Canon EOS 5D Mark II
Firmware Firmware Version 1.0.6
Shooting Date/Time 12/09/08 21:11:35
Owner's Name
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 15
Av( Aperture Value ) 8.0
Metering Mode Evaluative Metering
ISO Speed 50
Auto ISO Speed OFF
Lens EF85mm f/1.2L II USM
Focal Length 85.0mm
Image Size 5616x3744
Image Quality RAW
Flash Off
FE lock OFF
White Balance Mode Auto
AF Mode One-Shot AF
Picture Style Faithful
Sharpness 0
Contrast 0
Saturation 0
Color tone 0
Color Space Adobe RGB
Long exposure noise reduction 0:Off
High ISO speed noise reduction 3:Disable
Highlight tone priority 0:Disable
Auto Lighting Optimizer 3:Disable
Peripheral illumination correction Disable
File Size 24725KB
Dust Delete Data No
Drive Mode Single shooting
Live View Shooting ON
Date/Time(UTC)
Latitude
Longitude
Altitude
Geographic coordinate system
Camera Body No. 0220107044

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and----

File Name MG_9715.CR2
Camera Model Canon EOS 5D Mark II
Firmware Firmware Version 1.0.6
Shooting Date/Time 12/09/08 21:10:17
Owner's Name
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 4
Av( Aperture Value ) 8.0
Metering Mode Evaluative Metering
ISO Speed 200
Auto ISO Speed OFF
Lens EF85mm f/1.2L II USM
Focal Length 85.0mm
Image Size 5616x3744
Image Quality RAW
Flash Off
FE lock OFF
White Balance Mode Auto
AF Mode One-Shot AF
Picture Style Faithful
Sharpness 0
Contrast 0
Saturation 0
Color tone 0
Color Space Adobe RGB
Long exposure noise reduction 0:Off
High ISO speed noise reduction 3:Disable
Highlight tone priority 0:Disable
Auto Lighting Optimizer 3:Disable
Peripheral illumination correction Disable
File Size 23811KB
Dust Delete Data No
Drive Mode Single shooting
Live View Shooting ON

and

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