Case Pentax K7 (so small sensor). The objective is really excellent, very bright. As it opens at f1.8 (2.0 f start to prevent vignetting), it produces quite beautiful background blur. Optical distortions are minor and easy to edit. However, like many manufacturers, Pentax sells its housing without sun visor. I tried two worldThe: it; psc = 1 (plastic) and; psc = 1 (metal). Both agree. They allow to mount a filter (; psc = 1) between the lens and the lens hood. The metal sun visor does not properly attach the lens cap without unscrewing. it hurts me still that this objective is sold without a visor.
