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Forum: Pentax News and Rumors
01-31-2019, 05:22 AM
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I agree with you, the 16-85 is not optically perfect; like any other lens it is the result of many compromises in its design and manufacturing process. In this case there are more compromises than for others but hopefully it is good enough for the price and the scenarios in which I'm using it :).
According to my experience, I found it quite weak on the edges, in particular when dealing with the longer focal lengths. However it comes with a great margin of improvement over the 18-55, and closing it up to f/8 or f/11 the situation gets better. Still not an outstanding lens.
I honestly have never noticed a lack of sharpeness at the centre of my 50mm and I think it is just the result of a far from ideal alignment of my ink bottles. Admittedly I am not equipped to make quantitative measurements in this respect so it may totally be the case.
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Forum: Pentax News and Rumors
01-31-2019, 03:44 AM
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You can have mine. I will let you judge on your own.
The exif data is all there. The focal length between the two lenses was manually matched. So even if it is written 53 for the 16-85, it is the closest to the 50 frame also considering the focus breathing for that focus distance. All the images were shot focusing on the cap for the leftmost ink bottle. The frame has been cropped to preserve the horizontal resolution and keep the subjects centered on the vertical axis. All the pictures have been shot on a tripod with pixel-shift enabled. The ink bottles have not been moved during the tests, as well as the tripod. I hope you may find them useful.
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