I ran this test using a TIF file, which is recommended, as a jpg might
cause false reporting on hot pixels which are artifacts of jpg
compression.
When shooting RAW and using the converter of Photoshop CS to create a
TIFF, I didn't find any hot pixels.
With TIF writing by the camera on the flash card directly however, I did
find hot pixels, no dead ones. I did the test with Noise Reduction (NR)
on and NR off.
NR off NR on
30 s 834 3
15 s 82 5
8 s 31 0
4 s 25 0
2 s 15 0
1 s 17 0
1/2 s 11 0
1/4 s 5 0
1/8 s 2 2
same results up to and including 1/4000 s (2 hot pixels with NR off and
NR on).
On Sun, 2004-03-14 at 00:39, Dr. Shaun Canning wrote:
> Hi guys,
>
> Anyone willing too take part in a little experiment with your *ist D? I know how you
> guys all love comparing lenses and gear from
> time to time, so hopefully a few of you might help me out.
>
> I want to compare the number of recorded 'hot' pixels with other owners to see if
> the results I got from testing are normal or
> otherwise. It'll take about 3/4 of an hour to run the tests the same way I did.
>
> I used a little utility called 'Dead Pixel Test' which is available at
> http://www.starzen.com/imaging/deadpixeltest.htm
>
> I took a series of shots with the following set-up.
>
> 1. Lens cap on
> 2. Viewfinder cap on
> 3. Manual mode
> 4. Manual Focus
> 5. JPEG Highest Quality
> 6. F8.0 using FA 24mm (not that the lens should really matter)
> 7. Noise reduction On
>
> I took frames with shutter speeds ranging from 1/4000 down to 2 seconds (all speeds
> in between). I then used the Pentax Photo
> Browser to export a *.csv worksheet to work on in excel. Then I ran each frame
> through the test program, as per the instructions. I
> set the Luminance threshold to 60, and the Dead Pixel threshold to 100.
>
> Thankfully, I recorded no dead pixels, and the worst result was a total of 4 'hot'
> pixels at 1/8 and 1/6 sec. noise reduction does
> cut in at 1/4 sec, eliminating all 'hot' pixel occurrences from 1/4 too 2 secs.
>
> As other have pointed out, some of the images I uploaded yesterday definitely
> display hot-spots caused by these 'hot' pixels. What I
> am interested in is the results that anyone else may get to compare to my camera.
>
> Thanks in advance,
>
> Shaun
>
> Dr. Shaun Canning
> Cultural Heritage Services
> Lawrence Way, Karratha,
> Western Australia, 6714
> Mob: 0414-967 644
>
> [EMAIL PROTECTED]
> www.heritageservices.com.au
>
>
>
> -----Original Message-----
> From: Dr. Shaun Canning [mailto:[EMAIL PROTECTED]
> Sent: Sunday, 14 March 2004 6:37 AM
> To: [EMAIL PROTECTED]
> Subject: RE: *ist D Photos
>
> Thanks Mark. I would have liked the 'in flight' shot to be a bit sharper, but you
> know how fast these little buggers move. It was
> more luck than good management. I'm pretty happy with the overall performance of the
> *ist D though, even if I do have a couple of
> 'hot' pixels.
>
> Cheers
>
> Shaun
>
> Dr. Shaun Canning
> Cultural Heritage Services
> Lawrence Way, Karratha,
> Western Australia, 6714
> Mob: 0414-967 644
>
> [EMAIL PROTECTED]
> www.heritageservices.com.au
>
>
>
> -----Original Message-----
> From: Mark Cassino [mailto:[EMAIL PROTECTED]
> Sent: Sunday, 14 March 2004 2:54 AM
> To: [EMAIL PROTECTED]
> Subject: Re: *ist D Photos
>
> Cool photos, especially the dragonflies in flight.
>
> I was wondering how the *ist-D would do with bugs - looks great! (Mine
> arrived with the first snow, so no chance to test it on insects yet).
>
> - MCC
>
> At 12:41 PM 3/13/2004 +0800, you wrote:
>
> >Hi gang,
> >
> >Here are the results of my first foray into the bush with an *ist D. all of
> >the shots were taken with the *ist D, battery grip, FA 100mm macro. All were
> >handheld. Photoshop work was limited to sharpening and adjusting the levels
> >a bit.
> >
> >The files are all in the 1-3 mb range, so be warned, they'll take a while to
> >come down the pipe via a 56k modem. None of them are resized.
> >
> >http://www.heritageservices.com.au/Pentax%20ist%20D%20Photos/Web%20Gallery/i
> >ndex.htm
> >
> >Tell me what you think?
> >
> >Cheers
> >
> >Shaun
> >
> >Dr. Shaun Canning
> >Cultural Heritage Services
> >Lawrence Way, Karratha,
> >Western Australia, 6714
> >Mob: 0414-967 644
> >
> >[EMAIL PROTECTED]
> >www.heritageservices.com.au
>
> -----
>
> Mark Cassino Photography
>
> Kalamazoo, MI
>
> http://www.markcassino.com
>
> -----
>
>
>
>
>
--
Frits Wüthrich <[EMAIL PROTECTED]>
