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Forum: Pentax K-70 & KF 12-19-2016, 01:01 PM  
Pentax K-70 and Tamron not liking each other?
Posted By formercanuck
Replies: 20
Views: 3,713
What are the apertures set to ? I.E. Are both shots taken at f/5.6 ?
While I haven't used the Tamron 18-200, I do have the Pentax 18-55 and a Sigma 18-200.
The 'superzooms' such as the 18-200 typically suffer more outside of the center as they have to be able to function as both a wide (18mm), normal (55mm) and zoom (+135mm).
Even the decent Pentax 18-135mm has been critiqued on this 'issue' (Yes, I have one as well).
As a result, my 18-200mm was retired for my 18-135mm, which is my 'all in one' walkabout lens.
If/when I'm somewhat serious, I have a Sigma f/2.8 28mm, a Pentax f/1.4 M 50 (and f/1.8 DA) as well as a Rokinon f/1.4 85mm and a Pentax f/4 M 200mm.

In general, zooms with 3x or less are ideal for quality across the frame and at various focal lengths and aperture settings.
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