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Forum: Pentax SLR Lens Discussion
12-25-2018, 06:05 AM
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As far as I know Tamron is varifocal lens too. At least my copy is. If you have zoom lens I think, the best way to adjust AF issues is to adjust it on a longer "side" of the lens, in this particular case 50mm. It is due to DOF which is shallower on 50mm than on 17mm (comparing the same Fstop). That means the DOF on 17mm is deeper than on 50mm so possibility of taking sharp images on 17mm is higher even the focus issues are not properly adjusted.
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