I shot three trials for this example, choosing the best of the three to show here. Focusing the manual focus Pentax-A 45mm f/2.8 is hit-and-miss, even with the focus assist feature of the 645D.
The test scene is shown below.
Lighting was late in the day, and to the eye was not great, but the golden tiles looked better than what the 45/2.8 was able to deliver— a result that is rather dull looking.
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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.
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