Ricoh adds a new lens to its 645 medium format lineup, the weather-resistant HD Pentax-DA645 28-45mm F4.5ED AW SR. Covering a 22-35.5mm equivalent range in full-frame terms, it uses 17 elements in 12 groups. It’s Pentax’s first optically stabilized lens, with SR Shake Reduction technology that claims to compensate for camera shake for an additional 3.5 stops. The lens is dust- and weather-resistant, becoming available in August for a price of $ 4,999.95/£3,399.99. Read more