ERGONOMICS
Lens Mount
The Pentax DA* 200mm ED (IF) SDM f/2.8 prime is offered only in the Pentax KAF2 lens mount, a modernization of the long-lasting Pentax K mount. With a crop factor of 1.5x on DSLR cameras, the lens has a 35mm equivalent range of 300mm.
What separates the KAF2 mount from earlier versions is the addition of a contact for new lenses with a built-in Supersonic Motor (SDM), which the DA* 200mm employs.
Design and Build Quality
The Pentax 200mm is a fast aperture, internal focus (IF) prime, designed to cover the moderate telephoto focal length range and deliver sharp, professional-level image quality in any type of lighting environment.
This isn't a $200 telephoto lens we're talking about. The DA* 200mm is a massive, heavy lens with rugged build quality that is second to none in its price range ($1,100). Fit and finish are first rate with a mix of metal alloy and polycarbonate. The broad ridged-surface rubber focus ring is perfectly placed with the perfect amount of dampening and no focus creep. The DA* 200mm also features a weather resistant and dust resistant body which makes it perfect for use and abuse in any environment. Markings (distance scale in both feet and meters) are clear and easy to read and include a basic depth of field scale.
One feature that's worth mentioning is that the DA* 200mm lens uses fully automatic diaphragm control: you can't manually select the aperture by turning the diaphragm collar on the lens because there is no diaphragm collar.
Optical construction is all-glass with 9 elements in 8 groups, with ED elements and Pentax's new Super Protect (SP) lens coating which protects the exposed lens elements. The filter diameter for this lens is 77mm.
JerryJ
more : digitalcamerareview
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