chrisssteeven

A zoom lens provides more flexibility than prime, it can replace the function of 3 or 4 prime lenses and can stay on the camera full time. If you are in the field, not having to carry a kit bag full of lenses is a benefit. For action you can avoid having to swap lenses repeatedly for close and distant subjects.

CMOS consume low camera power than CCD to reduce heat and enhance battery life. CMOS sensors now producing cleaner images than CCDs. CMOS is cheaper so it is used widely in mobile camera. CMOS reduce camera cost to enable quick acceptance and proliferation.