May I recommend one additional stipulation. I ran the test for 13 exposures. I found an increasing trend among the number of hot pixels as the number of exposures increased. Perhaps if everyone would run the test with the camera having been at rest for an hour the results might be more consistent. Over the course of my 13 exposures the ratio of hot pixels from the 13th to the 1rst was 1.56.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rob Studdert Sent: Monday, February 09, 2004 9:37 PM To: [EMAIL PROTECTED] Subject: *ist D sensor noise survey Hey it's a while since we had a survey... I'm interested in making an informal survey of the noise performance of our *ist D cameras. Anyone with access to a PC who has permission to run the little test app at http://www.starzen.com/imaging/deadpixeltest.htm can participate. One exposure is all that's required for the test however in order to achieve consistency we need to make sure that each camera is set up the same. I propose that the test shot should be made as follows: 10 seconds manual exposure (lens capped) 200ISO Daylight WB NR off Saturation setting (middle) Sharpness setting (left most) Contrast setting (left most) sRGB CS TIFF L file The tiff file can then be opened and tested under the default settings of the DeadPixelTest application and the information file saved. I ran the procedure above and the results were as follows: [DeadPixelText] Version=1.0 Description= FileType=TIFF NumBadPixels=15 0=Hot,2798,135,69 1=Hot,1954,339,113 2=Hot,1809,585,64 3=Hot,726,610,112 4=Hot,726,611,192 5=Hot,726,612,112 6=Hot,2312,753,121 7=Hot,323,766,94 8=Hot,572,1365,116 9=Hot,1627,1400,64 10=Hot,2163,1958,96 11=Hot,2162,1959,113 12=Hot,2163,1959,145 13=Hot,2164,1959,112 14=Hot,2163,1960,98 The first two numbers is the pixel location and the last number is the heat, 0 being off and 255 being full on. So I have one pixel that's 3/4 on at 10 seconds. If anyone would like to mail me their results I'll collate and publish the data later down the track (I'll keep data sources anonymous if requested). Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
