The HD Pentax-D FA 645 90mm ED AW SR Macro is a short telephoto lens designed for use with PENTAX 645 digital cameras where the focal length is ideal for macro and portraiture. Pentax promises a beautiful bokeh (out-of-focus effect) thanks in part to an aperture with 9 rounded blades.
The lens provides up to 0.5x magnification and incorporates two ED (extra-low dispersion) elements and one glass-molded aspherical element in its optics.
The lens covers the full 645 format and can thus be used on 645 film cameras as well as on 645 digital cameras. It has built-in Shake Reduction and is weather-sealed like all other modern medium format lenses from Pentax. It was the first Pentax medium format lens to feature Pentax HD coating, which is superior to the traditional SMC.
The lens has a built-in motor for the autofocus function. On a 645 film camera the lens can be used in manual focus mode only, and only in P and Tv exposure modes due to the lack of an aperture ring.
It really makes the 645D shine. I have shot with 645 and 67 lenses from 35mm to 1200mm and this lens is the one that is clearly matched to the camera sensor. The look is so crisp and even with amazing color. Most all of the older film era lenses MUST be shot two three even four stops down to achieve a usable look for big prints. This is the only one that sharpens right up two thirds of a stop off the bottom. The stabilization feature can be amazingly useful although the sound it makes is dreadful, sounds like an electrical short. I really wish Ricoh would add a matched 40mm f2.4 and a 165mm f2.8.
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