"PENTAX *istDS IR" vs. "PENTAX K10D" ( seite in deutscher sprache) compareable pictures with exposure times of an unmodded pentax k10d and a modded pentax *ist ds with and without a hoya r072 infrared filter hardware Pentax *ist DS/IR (for infrared photography modifies camera) Pentax K10D HOYA R072 infrarot filter noname china 950nm infrarot filter software Phase One Capure One Pro 3.77 Abobe Photoshop CS3 results Pentax *ist DS/IR (modded) Hoya R072 filter extends exposure time by a factor of 8x = 2^3 = 3 f-stops exposuretime calculation: (exposure-time with hoya IR filter) = (exposure-time without filter)/8 950nm IR filter extends exposure time by a factor of 128x = 2^7 = 7 f-stops exposuretime calculation: (exposure-time with hoya IR filter) = (exposure-time without filter)/8 Pentax K10D (unmodded) Hoya R072 filter extends exposure time by a factor of 50000x ~ 2^15.6 ~ 15-16 f-stops exposuretime calculation: (exposure-time with hoya IR filter) = (exposure-time without filter)/50000 950nm IR filter extends exposure time by a factor of 250000x~ 2^18 ~ 18-19 f-stops exposuretime calculation: (exposure-time with hoya IR filter) = (exposure-time without filter)/250000 0. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter with China IR-Filter 950nm 1/125sec f8 iso200 124sec f8 iso200 143sec f8 iso1600 (== 1144sec f8 iso200) Pentax *ist Ds IR (modded/removed ir-cutfilter) without Filter with HOYA 072 IR-filter with China IR-Filter 950nm 1/250sec f8 iso200 1/90sec f8 iso200 1/4sec f8 iso200 1. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter after Whitebalancing after Channelshift as IR-composite 1/45sec f16 iso200 252sec f16 iso200 Pentax *ist Ds IR (modded/removed ir-cutfilter) without Filter with HOYA 072 IR-filter after Whitebalancing after Channelshift as IR-composite 1/90sec f16 iso200 1/30sec f16 iso200 2. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter after Whitebalancing 1/250sec f16 iso200 242sec f16 iso200 Pentax *ist Ds IR (modded/removed ir-cutfilter) without Filter with HOYA 072 IR-filter after Whitebalancing 1/30sec f16 iso200 1/90sec f16 iso200 3. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter after Whitebalancing after Channelshift as IR-Composite 1/350sec f8 iso200 80sec f8 iso200 Pentax *ist Ds IR (modded/removed ir-cutfilter) without Filter with HOYA 072 IR-filter after Whitebalancing 1/350sec f8 iso200 1/180sec f8 iso200 4. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter after Whitebalancing after Channelshift as IR-Composite 1/750sec f8 iso200 70sec f8 iso200 Pentax *ist Ds IR (modded/removed ir-cutfilter) without Filter with HOYA 072 IR-filter after Whitebalancing after Channelshift as IR-Composite 1/1000sec f8 iso200 1/350sec f8 iso200 5. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter after Whitebalancing after Channelshift as IR-Composite 1/500sec f8 iso200 96sec f8 iso200 Pentax *ist Ds IR (modded/removed ir-cutfilter) without Filter with HOYA 072 IR-filter after Whitebalancing after Channelshift as IR-Composite 1/750sec f8 iso200 1/250sec f8 iso200 6. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter after Channelshift as IR-Composite 1/250sec f8 iso200 144sec f8 iso200 7. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter after Channelshift as IR-Composite 1/500sec f8 iso200 104sec f8 iso200 8. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter as IR-Composite 1/125sec f8 iso200 400sec f8 iso200 9. serie: all pictures at the same time Pentax K10D without Filter with HOYA 072 IR-filter after Channelshift as IR-Composite 1/500sec f8 iso200 100sec f8 iso200 10.serie: all pictures at the same time Pentax K10D without Filter with HOYA IR as IR-Composite 1/500sec f8 iso200 92sec f8 iso200 11.serie: all pictures at the same time Pentax K10D with HOYA IR after WB 363sec f16 iso200 Pentax *ist Ds IR (modded/removed ir-cutfilter) with HOYA IR after WB 1/45sec f16 iso200 {hot link to this tutorial: http://www.xdeltax.com/tutirdsvsk10d/index.html}