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Latest Review Posted HD Pentax-DA 70mm F2.4 Limited
This lens is a true gem. Very small, very light, looks and feels very well built. Being a pancake lens it is very unobtrusive. A smart choice if you don't want to stick out in a crowd.

Optically it is top-notch. The center is sharp wide-open at f2.4 with the borders and corners not too far behind. If you're pixel-peeping you will see it requires about 1-1.5 stops to get the corners truly crisp. However, since many will be using this as a portrait lens its more than adequately sharp at the widest aperture.

Vignetting is present and you will notice a difference upon stopping down one EV. The good news is that vignetting has a very smooth transition and is easily correctable in post-processing.

The typical chromatic aberrations found on large-aperture lenses can be found, but only when looking very, very closely in the corners. Purple fringing does happen in high-contrast transitions. However, just like the vignetting characteristic, what little fringing and CA that does occur can be fixed quite easily when processing RAW files.

Auto-focusing is quick, but there is the unfortunate downside of the audible screw-drive mechanism. Personally, I don't see this as a real problem. The noise is most obvious when you're focusing from one extreme to the other. If you're merely adjusting focus to the subtle movements of your subject then the noise is a mild chatter. Manual focus gives just the right amount of resistance - something sorely lacking in many other lenses.

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