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Forum: Pentax SLR Lens Discussion 11-13-2018, 11:20 AM  
How 4K looks using 18-135?
Posted By mikesbike
Replies: 18
Views: 993
Most zoom lenses are not as good at their extreme zoom length or sometimes width. But Norm's excellent demonstration proves the DA 18-135mm is not as bad for edge performance as the chart based on lab equipment indicates. My experience parallels Norm's. The central area remains sharp throughout the range, in fact exceptionally so for such a zoom range. The softening towards the edge at longer FLs is gradual, and not all that bad, especially since central-based subject matter at that FL often benefits from it anyway, where it blends into a defocused background. The bokeh in fact is quite good. I don't pay too much attention to corner evaluation. Not much in the extreme corners of most photos is worth talking about, except vignetting.

This well-built lens is also remarkably compact for such a zoom range, and its AF performance is exceptional also.
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