Lets test our A2

[Ilia220089]

There was an interesting discussion on dead/hot pixel test on A1.

http://forums.dpreview.com/forums/read.asp?forum=1024&message=7059672

Probably A2 user are interested to test their A2?

I can't follow the rules of the test, becuse I sent my A2 to Minolta, but I did a tests before.

I quote a part:

"Download this neat little free utility that you run your pics through to test for bad pixels at:

http://www.starzen.com/imaging/deadpixeltest.htm

Make sure you:

a. Shoot in .tif format only with the lens cap on.

b. TURN OFF NOISE REDUCTION - if noise reduction is on (the default) it will not find the bad pixels.

c. Shoot at 4 different shutter speeds: 1/30, 1/10, 1sec, 2 sec
d. report how many and which kinds found (hot or dead) "

report:
1/30 - "number" dead pixels / number" hot pixels
1/10 - "number" dead pixels / number" hot pixels
1 sec: "number" dead pixels / number" hot pixels
2 sec: "number" dead pixels / number" hot pixels

 

[Ilia220089]

Here is my result.
Because I don't have the camera now, so I publish only what I have:

ISO 64 (default settings in camera and in program)

0.6 s: 1 dead pixel, 949 hot pixels

serial number: 314044**

 

[Ilia220089]

I looked at my old files and

ISO 100

1/500s: 0 dead / 9 hot (luminance about 100)
1/250s: 0 / 9
1/125s: 0 / 9
1/60s: 0 / 10
1/25s: 1 / 10
1/13s: 1 / 10
1/6s: 1 / 10
1/3s: 1/ 10
0.6s: 1 / 201

ISO 64

1.3s: 1 / 2 393
2.5s: 1 / 21 048
5s: 228 / 119 336
10s: 1 764 / 460 254
30s: 1 830 / 1 492 806

serial number: 314044**

All files were converted from MRW to TIFF with default settings in DIMAGEViewer

 

[summerwind]

1st one had 2 hot at any exposure

2nd had 4 hot at .06 and up

3rd had 2 at 1 sec on up
4th one had 1 at all exposure, and 6 at 1 sec.........

i don't test beyond that since it's pointless with a digicam

really though, to do this is just asking for dissapointment.

if you have 1 or more at all speeds when brand new, then i'd replace, but even a clean one will develop them over time.

 

[Ilia220089]

If there is someone interested...

So, I got my A2 back after reparation and KM replaced photo-sensor.
Here is my noise test results with repared camera.

Noise reduction - OFF. RAW - converted to TIFF with default settings in Dimage Viewer.
ISO100

Shutter speed: dead/hot pixels

1/500s: 0/0
1/250s: 0/0
1/125s: 0/0
1/60s: 0/0
1/30s: 0/0
1/15s: 0/0
1/8s: 0/0
1/4s: 0/0
1/2s: 0/0
1s: 0/25 (average luminance 73)
2s: 0/500
5s: 12/23 179
10s: 148/147 656

Wow!!! That's amazing!

Sorry if I bother you with just my problems...

ISO 100

1/500s: 0 dead / 9 hot (luminance about 100)
1/250s: 0 / 9
1/125s: 0 / 9
1/60s: 0 / 10
1/25s: 1 / 10
1/13s: 1 / 10
1/6s: 1 / 10
1/3s: 1/ 10
0.6s: 1 / 201

ISO 64

1.3s: 1 / 2 393
2.5s: 1 / 21 048
5s: 228 / 119 336
10s: 1 764 / 460 254
30s: 1 830 / 1 492 806

serial number: 314044**

All files were converted from MRW to TIFF with default settings in
DIMAGEViewer

 

[SwissShooter]

100 iso no dead hot pixel until 1s where 1 hot shows up, at 2s 118 hot
64 iso same thing 2.5s 210 hot

 

[SwissShooter]

100 iso no dead hot pixel until 1s where 1 hot shows up, at 2s
118 hot
64 iso same thing 2.5s 210 hot

and serial is 314066**

 

[Ilia220089]

you have a bit better one

100 iso no dead hot pixel until 1s where 1 hot shows up, at 2s
118 hot
64 iso same thing 2.5s 210 hot

and serial is 314066**

 

[segmented]

Hi,

Since you have all these files from your lens cap test and a brand new CCD, I wonder if you could try this:

• open the file in photoshop
• go to adjust levels
• move the right arrow of the histogram towards the left (or alternatively, click on the AUTO LEVELS), until the noise becomes very apparent ( this make the image look noisy, but nothing to worry about, it's just the noise are now all amplified)
• can you see any obvious lines? It's like hot pixels which seem to be non-random and grouped together as a line

My camera (an Olympus) showed a vertical line when I did this. Even in real-life pictures, the line appeared especially at higher ISOs. Later it became worse and I sent it for repair. Now it's OK, I suspect they changed the CCD. But with the test above, I can still see a couple of lines (at different location), although they don't appear in real-life pictures now. So I'm wondering if such non-random hot pixels that show up as lines are characteristics of CCD.

Thanks.

 

[SwissShooter]

Just tried the PS test, no pattern to be found not even at my 2s shot. So I think I'm really fine with my cam.

 

[Ilia220089]

Hi!

I don't see any lines. I think noise is quite ramdom (in both cases with my A2 before and after reparation).

But I had a pattern of hot pixels 3x3 with - luminance about 100(even at 1/500s!). After reparation, with new CCD I can't see any patterns of hot pixels.

Hi,
Since you have all these files from your lens cap test and a brand
new CCD, I wonder if you could try this:

• open the file in photoshop
• go to adjust levels
• move the right arrow of the histogram towards the left (or

alternatively, click on the AUTO LEVELS), until the noise becomes
very apparent ( this make the image look noisy, but nothing to
worry about, it's just the noise are now all amplified)

• can you see any obvious lines? It's like hot pixels which seem to

be non-random and grouped together as a line

My camera (an Olympus) showed a vertical line when I did this. Even
in real-life pictures, the line appeared especially at higher ISOs.
Later it became worse and I sent it for repair. Now it's OK, I
suspect they changed the CCD. But with the test above, I can still
see a couple of lines (at different location), although they don't
appear in real-life pictures now. So I'm wondering if such
non-random hot pixels that show up as lines are characteristics of
CCD.

Thanks.