Hi Frits, It seems like the hot pixel phenomena are pretty widespread, but then some don’t seem to have any at all. It will be interesting to see what the 'average' number of hot pixels is amongst those who submitted results to Rob.
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: Frits Wüthrich [mailto:[EMAIL PROTECTED] Sent: Monday, 15 March 2004 7:37 AM To: [EMAIL PROTECTED] Subject: Re: *ist D Pixel Comparison Test 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]>
