Pentax smc FA 43 mm f/1.9 Limited
4. Image resolution
A very good result at the maximum relative aperture sticks out at once – the lens reaches the value of 39 lpmm there, so significantly higher than the decency level. Cheaper 1.8/50 class constructions have to be stopped down to over f/2.0 to become fully useful. The higher quality of the Pentax optics is clearly noticeable at first glance. On further stopping down the image quality even improves and it reaches its peak near 53 lpmm by f/5.6.
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The performance on the edge of the frame is a big disappointment, though, especially as it is the edge of the APS-C/DX sensor and the lens, after all, was designed for full frame. The area near the maximum relative aperture is completely useless and only after stopping down to f/4.0-f/5.6 the image quality becomes decent. For a lens from this price segment such a result is especially weak
How it looks in reality you can see in the crops below, which were taken from JPEG files. First we get the image taken by f/1.9 and f/5.6 in the frame centre and at the very bottom there is a crop taken from the top left-hand corner of the frame by f/1.9.
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