DPReview.com is closing April 10th - Find out more

17-70mm lens (Pentax or Tamron advice please)

Started Nov 26, 2020 | Discussions thread
Hythloday Senior Member • Posts: 2,349
Re: Proof is in your pudding

Massao wrote:

Unfortunately, can't see those images.

The images were on Photobucket, but the reactions are clear enough.

How good/bad a lens performs is also depended on the camera. Below is a link to the Sigma 17-70mm in a Pentax K200D and a Pentax k3:

Sigma 17-70mm F2.8-4 DC MACRO HSM C Pentax on Pentax K200D vs Sigma 17-70mm F2.8-4 DC MACRO HSM C Pentax on Pentax K-3 (dxomark.com)

Generally speaking,  lenses perform better in newer cameras. My Pentax DA17-70mm scores better on my K-3. The sharpness in the centre and borders is better. My Pentax DA16-45mm also scores better on my K-3II, at least in the centre, but at the borders the sharpness is slightly better.

The Pentax DA17-70mm and the Sigma 17-70mm have one thing in common: the AF system is the weakest point. The Pentax DA17-70mm sometimes refuses to focus at 70mm, when contrast is low. Simply use quick shift and the problem is solved. But the Sigma 17-70mm is unreliable at focussing, as you will read in the link to my test.

Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow