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Pentax-A 200mm f/4

How good is the manual focus Pentax-A 200mm f/4? My first attempt was met with abject failure, since I found it impossible to focus accurately either by eye, or using the autofocus assist function.

I returned to this scene another day when the lighting was brighter, and I worked hard (by eye) to get just-right focus. The results follow below.

Test scene

This is the entire frame as shot, crops follow.

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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

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