I used my istD since 2004, and since then Pentax launched various 'new models' with the same CCD. 6MP is not really enough for large prints, so there is no point to replace my istD with those 'new models'.
The K10D upgrade the CCD and resolution, but then it has downgraded the hi-ISO... the highest sensitive for K10D is ISO1600, vs istD's 3200. Since I do many might-time available-light shots, it's really a degrade. My suspect was Pentax is not happy with the hi-ISO performance of K10D's CCD, therefore restricted the ISO to 1600 only.
The K20D comes with max ISO6400, really good. I tried K20D at ISO 3200, and the result is amazing!! All the below sample was shot with K20D, FA77, in jpeg 2-star setting, without the NR.
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