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:

For sure but some zoom lenses are better than others and Pentax DA 17-70mm is amongst the worst one in this case.

The Sigma AF 17-70mm f/2.8-4.5 DC is a very good standard zoom and a viable alternative to the Pentax offerings in this range. Generally it is capable to produce very sharp results although the corner performance leaves a bit to be desired at 17mm at large aperture settings. The vignetting level could also be a bit better here but most competitors don't offer a f/2.8 settings anyway and from f/4 it follows the mainstream. The level of distortions is about typical for a standard zoom whereas chromatic aberrations (color shadows) are comparatively low. The build quality is very fine for a lens in this price league.

Sigma AF 17-70mm f/2.8-4.5 DC (Pentax K) - Review / Test Report - Sample Images & Verdict (opticallimits.com)

The Pentax DA SMC 17-70mm f/4 AL [IF] SDM is undoubtedly the most desirable standard zoom lens in the current Pentax lens lineup. The resolution characteristic is very good without any significant weakness. The vignetting and distortion are about average for a lens in this class. The lateral CAs are relatively well-controlled although you may spot some traces in field conditions when using wide-angle settings. The quality of the bokeh (out-of-focus blur) seems to be very fine albeit limited compared to fast prime lenses naturally. Contra-light situations are handled fairly well with comparatively underdeveloped ghosting problems. Typical for most Pentax DA lenses the build quality is on a very high level. The fast and near-silent ultrasonic AF is also a very welcome new feature. All-in-all a very harmonious package selling for a very fair price of around 480€/US$.

Pentax SMC DA 17-70mm f/4 AL [IF] SDM - Review / Test Report - Sample Images & Verdict (opticallimits.com)

You do realise that: 1) those tests and conclusions are from 2007/8? and; 2) both those conclusions were written independently without drawing any direct comparison with the other lens? Posting them together would not create an automatic comparison between both lenses.

The 480Euro/USD maybe a fair price (relative to performance) in 2007/8 but is it a fair price in 2020? Actually, the price is even higher today--at least here. About 660 Euro/800 USD in Norway by today's exchange rate.

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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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