The resolution of sensors drops with high ISO anyway, without any NR applied, because the least significant bits of each pixel become random values instead of representing small changes of contrast between adjacent pixels. Typically, professional sport cameras use sensor with lower mega pixel count because it would be a waste of computing power and storage to have a high resolution sensor with more noise per pixel.The idea behind adding NR above a certain ISO is to emulate a sensor with larger pixels, less noise per pixel equivalent and less data to transfer to the SD cards (noise contribute to larger files without contributing anything to image quality), hence the name for it "accelerator". This should have been explained by Ricoh, finding the right words to explain it so everyone can understand.
---------- Post added 05-08-19 at 20:12 ----------
Originally posted by Kingman Also I cannot detect any significant AF speed difference using the D FA 24-70/2.8 and the D FA 28-105 and the D FA 100/2.8 Macro and the D FA 70-200/2.8 on either bodies.
Ah ah, that's very normal. On Pentaxes, the AF speed is limited by the lenses, that's why a 55-300 PLM focuses a lot faster than a DFA24-70 when mounted on the exact same camera. What the K1 II is said to have improved is on the AF C. (Continuous) tracking algorithm , not on the speed of AF.S. So, your observation is correct and your conclusion is wrong. Also, what count in AFS isn't AF speed, it is the lag time between AF lock and exposure, because that lag time is what makes AFS image slightly out of focus when the subject distance to camera is changing.
Last edited by biz-engineer; 08-05-2019 at 11:08 AM.