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A rather good lens to say the least

Started Mar 22, 2018 | User reviews thread
Ptitboul Forum Member • Posts: 78
Re: A rather good lens to say the least

Check for focus adjustment at 70mm.

I made my tests using LiveView, to avoid focus adjustment issues.

Also, zoom lenses tend to be softer at the long end.

It depends on which model of lens, but yes indeed, the Tamron 24-70/2.8 (which is the basis of the Pentax 24-70/2.8) is softer at the long end. But I am wondering whether mine is softer than it should.

Here is what I get. These are 100% crop of the center, focus was made using liveview, and conversion from RAW to JPEG was made by DxO OpticPro 11 with default settings.

Center of the picture at f/2.8

Center of the picture at f/4

Center of the picture at f/6.3

 Ptitboul's gear list:Ptitboul's gear list
Pentax *ist DS Pentax K-5 II Pentax K-S1 Pentax K-1 Pentax smc FA 50mm F1.4 +12 more
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