Pentax has made some rather good digital SLRs even if they don't quite match the sophistication and consumer-friendly feel of Canon and Nikon offerings.(Don't forget to keep checking the Techradar Camera Channel home page for the latest camera reviews and news.)And on paper, the Pentax K-S1 looks like a perfectly decent alternative, with good basic specifications and some interesting technologies. Which makes it hard to understand why Pentax feels it needs to release it in an array of different colours ? including a new 'sweets' collection.At its heart is a 20-megapixel CMOS sensor with a sensor-based shake reduction system ? in principle, this will provide an image stabilising effect with any lens, and it does actually work very well.This system is also used for the Pentax's unique 'anti-alias simulation' modes.