DA Limited series lens is the pursuit of superior performance and compact texture for the purpose of K-AF bayonet fixed lens series. HD DA 21/3.2 lens size of 63mm × 25mm, weighs 134g. Adhering to this series of compact and lightweight characteristics. Although due to the small but well into the camera bag inside , but can be placed in the included storage bag and then put the bag in normal use , very portable .
The lens and the smc version 21/3.2 specifications of basically the same, closest focusing distance of 0.2m, the minimum aperture of f22. Although the use of the old AF system, but the realization of an extremely compact body design . Aperture excellent design , combined with a high sense of quality of the latest SLR cameras , at f3.2 aperture , image quality performance is also excellent . The equivalent focal length of 32mm, plus the whole focus effect, very quickly the most suitable for everyday photo shoot .
The lens smc version followed the aluminum tube design and optical systems. Its filter diameter of 49mm, a factory can be enhanced to provide a protection force and effect play a dark filter device . However, the filter is installed , you can then install the lens cover , so there is 43mm filter inside the screw used to install filters.
The lens uses five groups of eight optical structure, the first lens front with SP coating , the end of the configuration one hybrid aspherical lens . Pentax uses unique floating bodies . In close-up applications, floating mechanism can effectively compensate for the curvature of field and sharp detail to restore the image . Built-in 7 aperture blades , aperture at F3.2 ~ F4 can get natural, beautiful bokeh blur effects. In addition, using a rapid conversion focusing system, with full-time AF / MF switching function , and in the focusing ring does not rotate during focusing .
Quality , in addition to the four corners outside the aperture fully open the image has a very good resolving power . At f4.0 aperture , the overall picture sharpness , picture after closing small aperture further enhance performance , presented in the best condition f8.0 aperture , a small aperture to f11 when received comparatively good quality , f16 , due to diffraction effects , Resolving power began to decline ; aperture tightened to F22 , the image is only suitable for a small map viewing.
Fixed lens generally prone to distortion , so the best match with distortion correction function of the camera, or through professional image correction software for post-processing . Tests, the lens focusing distance of about 2m shooting, the camera is turned on if the distortion correction function , then because of the transitional compensation , the screen showed a slight curl corners . Maybe the camera compensated reference condition at infinity is distorted it. However , the lens in suppressing chromatic aberration of magnification was quite good , not feel completely aberration problem .
The lens in addition to inheriting Limited series lenses exceptional detail description ability and excellent appearance , the most important is the inclusion of advanced HD coating and rounded diaphragm makes blur and backlit performance has been greatly improved. In addition , as a 21mm wide-angle lens , the description of the image edge capabilities and resolving power of the lens has also been greatly improved.
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