Good price / Leitungsverhaeltnis

After a previous failure with another Tamron (AF 18-200mm), I dare with this lens a new attempt in Lowpricebreich. For me, the imaging performance is very satisfactory. For portraits I prefer the sharpness rather manually because the AF is elsewhere but rarely oriented to the eyes - the high light intensity is as readily accepted by Focus / Focus. That may also be a Pentaxproblem and does not depend necessarily on the optics. Mechanically she runs perfectly so far, but is not watertight as otherwise most Pentaxlinsen. The engine is quite noisy and not the fastest; for normal applications the speed is absolutely sufficient. The focal length corresponds to more like 50 to 105mm. For the little money in any case recommendable! I paid 318.
(Pentax K-5, FW 1.12)

Update, 04/03/2012
After intensive use my first impression is to be confirmed. The images are sharp enough for enlargements up (so far) 50x75cm. I can not make noticeable sharpness as I said okay very blurred edges with existing equipment. In bad weather continues but the fainter very good Pentaxobjektiv the Tamron has it because it is not weather resistant - was down to minus 7 degrees but without a murmur with the terrain.
(Pentax K-5, FW 1.13)

Update, 08/08/2012
So far, no loss and the better I get to know the peculiarities of the lens, the better the results. Price is currently around 340
(Pentax K-5, FW 1.13)

Update 11.03.2013
Am still very satisfied with the Tamron. Have been heard of smaller quality fluctuations in production, but that could understand neither my nor to the lenses from other users (to Canon and Nikon). Due to the constant satisfaction for over a year to upgrade to five stars!
(Pentax K-5, FW 1.14)

Update 01/10/2014
Lens makes perfect their service. We were with hefty sub-zero temperatures, drizzly weather and snow with the dog in the field and the interaction with the K-5 is still very good. Have the impression that after the last firmware update of the AF quicker finds its focus. Would recommend this and also take you safely with the new K-3 - once reached an adequate level in the price.
(Pentax K-5, FW 1.15)

Update 07/02/2015
The end of the guarantee period comes slowly into view. We have now mastered weddings and baptism under difficult conditions. With minimal support flash, but mostly without additional light. As before, the Tamron makes the rough-road use (currently frosty -7 degrees, snow and windy) seemingly do not mind. Since the firmware update to 1.16 Combo delivers now more reliable AF. Price today 364
(Pentax K-5, FW 1.16 DxO OpticsPro10)