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Latest Review Posted SMC Pentax-A 400mm F5.6
This lens is not designed for tracking fast moving object in view of its long range of focusing distances and f/5.6 maximum aperture. It does suffer from purple fringing with strong backlighting.

Considering its relatively light weight, it is a good handheld lens for snapshot and birding.

Image quality will greatly improve when stop down to f/8 or below. When stop down to f/11, the image quality is superb and sharp.

Samples @f/11 are attached below:

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