The Nikkor is much better, though still not perfect -- I'll still need to stop down significantly to shoot blue skies, but the horrible gray fleck in the upper-right corner that plagued me on both copies of the Pentax that I had is gone, gone, gone.
Here's a falloff analysis of the Pentax and Nikkor at 30mm and f/4. Each color band is another 3% luminosity falloff, except for the red band which is the limit of the visualization, so red = serious bad. Pentax is first.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxMb008BjwhIQrvojpYCptkHatDZWh2eQLG8irHktGTLkrKpc2SKs1MBWiA-bej8pNHAfsAUjihN7oAXszDiZpmqsGdVidOj0lL_yg0zXcl0GjKUNIkLdkFXe1k0_dUswaUuStLk6SrQ/s400/3559.29_38f4.lum.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhlGxpuqOMWEMkHAVmztlKH6j8fgOnWmgdP936H433wXJ-n61uj9Rs0_B_mY9ibuU94rZnDawKBLBGDirPnK9y616uEUgxBgDxX_KDpSvj7IjKWlyGx6kUtlCcGVbvJi1W6flnqCRVVnQ/s400/0087.29f4.lum.png)
And here's the images that produced the above. Quite a difference.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg22ttIRWUvXl6TGnz6Y9FDE3moa04748R2ccR1tEMmOOeNYbCzRwb7J-x3deRfEvlCmzvvVfMPgZFh5_LU6NGPAe5umyCl22qCmTMYibk-_4HLcJ204lrqUz3xnnWln5Ea8BEZQKRhVg/s400/3559.29_38f4.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjUF6Yq2KlL80eYZhV0v9-1m00797BCDrwh7LOgy-VCeQOgosKaqNS86FonoQ6z-FQQYShB6ZmqoRfE7sTUuDSf5k9xm8xI2vbZTMjyPwrqDBO-zO6a5ASQ5qTvxvie-frJ_0TUiwguLA/s400/0087.29f4.png)
Verdict: Pentax SMC DA 18-250mm f/3.5-6.3 ED AL [IF] = fail. Note that the Tamron AF 18-250mm F/3.5-6.3 Di-II LD Aspherical (IF) Macro is the same lens, so also fail I would assume.
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