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Tamron sp 70-300 f/4-5.6 With VC & Autofocus Strange

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I got this Tamron sp 70-300 f/4-5.6 With VC & Autofocus, something i notice, that if you focus on lets say a flower right in the center lets say 200 or 300 mm using shutter speed 1/160 F8

ISO 100, As you go away from the center the image will seem to go out of focus, or if they was something just 1 or 2 inches in front of the subject that will be way out of focus.

So this tells me this lens is impossible to get good hyperfocus & wide depth of field, even at apertures at F8 wich is strange not even the 7-200 i have does this..

Just shot around to test this lens and yes in the very center it's sharp..

 

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