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

Started 3 months ago | Discussions thread
Massao Senior Member • Posts: 2,580
Re: Proof is in your pudding

Hythloday wrote:

Massao wrote:

Are you saying DA 17-70mm is not good for aperture below f/8? If so, we agree:-D

Some 14 years ago I tested the DA16-45mm qnd the Sigma 17-70mm, see:

Pentax 16-45mm vs Sigma 17-70mm: Pentax SLR Talk Forum: Digital Photography Review (dpreview.com)

I'm not sure why you keep jumping to DA 16-45mm lens. Its not a topic of this discussion and its performance cannot be used to infer anything about DA 17-70mm lens except the logo.

The Pentax DA16-45mm is slightly less good below that aperture, whereas the Sigma 17-70mm is really horrible, at the WA end.

As I've shown with test images, DA 17-70mm is among the worst options while Sigma 17-70mm is among the better options. Sigma 17-70mm is certainly not ideal at 17mm but the question here is: is DA 17-70mm better at 17mm than the older version of Sigma 17-70mm? the second question is: can a lens be recommended to others if it only produces acceptable results at f/8? Lastly, have you found the "yellow colour cast " of Sigma and "nice rich colours " of DA 17-70mm in the comparisons I posted?

Here are images from both DA 17-70mm and Sigma 17-70mm at 17mm

DA 17-70mm at 17mm

Sigma 17-70mm at 17mm

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Kind regards,
First camera: Canon FTB; First autofocus SLR camera: Pentax; First Nikon: F601 (N6006); First digital camera: Sony DSC-W5; First DSLR: Nikon D70; First mirrorless ICL camera: Samsung nx11

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