Pentax has cut the cost of entry into medium format photography with its two digital cameras, the 40-megapixel 645D and the more modern 50-megapixel 645Z. Lens prices for the system run the gamut, from the $700 FA 75mm prime all the way to the $5,800 FA* 300mm. The HD D FA 645 Macro 90mm F2.8 ED AW SR ($4,499.95) is at the high end of the scale, but it's an excellent performer. It includes image stabilization, a rarity in the line, and its weather-resistant design is essential for photographers working in inclement conditions. It's a solid performer, and worth its high price. If you can live without stabilization or weather resistance, Pentax offers the FA 120mm F4 Macro ($1,599.95) as a more affordable alternative. DesignThe 645 Macro 90mm is bigger than most 35mm SLR lenses, but isn't out of line for medium format, measuring 2.5 by 1.5 inches (HD) and 2.3 pounds. It supports 67mm lens filters and ships with a petal lens hood that can be reversed when not in use. Like the 645D a...
The HD D FA 645 Macro 90mm F2.8 ED AW SR is a super-sharp macro lens for the Pentax medium format system that, aside from a very high price, has few weaknesses to speak of.
Quite sharp; Wide f/2.8 aperture; Shake reduction system; Weather-sealed design
Expensive; Magnification limited to 1:2; Slow autofocus