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Pentax K-30 Digital Camera Review
The Pentax K-30 offers four levels of noise reduction, as well as the ability to turn it off. The four levels include low, medium, high, as well as an automatic feature. The automatic setting returned noise results similar to the "low" and "off" settings, moving up to about a medium level at ISO 6400 and above. More on how we test noise.
The detail loss up to ISO 12800 with noise reduction activated is not terribly significant, but setting noise reduction to the "off" setting in JPEG does result in sharper images. It didn't result in substantially better images in terms of print quality, however. One thing to note though is that noise reduction at any setting but "off" or "auto" smears detail out even at the minimum ISO of 100. Our recommendation is to stick to off or auto whenever you're shooting in JPEG.
The Pentax K-30 offers an ISO range of 100-12800, with the option to set ISO manually or automatically. You can also extend the ISO up to 25600, but you have to go into the custom menu to activate that first.