Reviews and Problems with Pentax DA 17-70mm f/4 AL [IF] SDM
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Sharp images with crisp colors and detail
18 July 2013
Summary: I purchased this lens to replace another Pentax lens, the 16- 50mm DA lens which I found to be an underperformer, given its cost. The DA 17-70mm lens has performed well and is definitely an upgrade from the 16-50mm DA lens it replaced. The autofocus system does work well and only ocassionally misses its mark but is usually quick and responsive. The images this lens produces are crisp and very sharp especially when the lens is stopped down.
Summary: I like the range and the f4 has good narrow focus range, the lens is not as sharp as the 50-135 Pentax Star lens or the Sigma 18-50mm 2.8 that said it focuses well and better than the 50-135mm. It is not super sharp at wide angle and mine is sharper at 70mm which is where I will use it the most. As my carry around general use lens it will be great, my daughter will get my Sigma 18-50mm 2.8 for her commercial work now.
Summary: Picked up one of these as it has a good range in terms of 35m (26-107). Also wanted to get it before pricing continued to go up up up. Harder to find this online in Canada for cheaper than $500US/700CDN. Quite solid build, and heavy! Still trying to learn how to get used to this lens as it behaves differently from my 16-45. Sharpness appears to be get better around 5.6/6.3, and solid at f8.
Darkmunk "I'm not a monk and I'm not dark", Amazon
15 March 2013
Summary: I found I used it a lot in the studio and miss it now I've dropped it :( It's a little soft, but still very usable even for commercial work. I dropped mine from about 6 inches onto a laminate floor, which is fairly forgiving normally, but despite landing on the hood, something broke inside and that was that.
Summary: I have used pentax since 1981. I bought this lens hoping that it would conquer my focussing troubles. I have pentax K5 and Samsung GX20, and have found with both bodies that lenses focus very nicely at the long end of the zoom but the wide end tends to be focussed too far away. After purchase this lens was returned to pentax for re-calibration, and a new K5 body was put onto it, but still it focusses too distantly when at the wide end.
Excerpt: I just started to use this lens on a new camera but feel it will be in my standard setup from now on. From the start this lens is impressive for its smooth quiet operation and extra fast focus.
Excerpt: Купил за недорого ( 479$) ,снимаю последний год только им-как универсальный очень хорош-получаемый результат меня вполне устраивает.Пробовал Tamron 28-75-понравился меньше-может попался неудачный экземпляр.
Pros: Недорогой,хороший конструктив
Cons: в помещении требователен к освещению-f4 все-таки
Excerpt: Похоже, ХА на коротком конце - фирменная черта зумов Pentax: 16-45/4, 12-24/4, 17-70/4, даже звёздный 16-50/2,8 несвободен от этого... К счастью, ХА проявляются не всегда и убираются редактором, да и внутрикамерная обработка в новых тушках присутствует. Нужно признать, что, из перечисленных объективов, 17-70/4 хроматит меньше других. Использую с тушкой К-х, проблем с фокусировкой не наблюдал.
Pros: резкий по всему кадру, широкий угол, удобный диапазон фокусных, добротный конструктив, на 24мм - практически полное отсутствие дисторсии.
Cons: ХА на коротком конце при полностью открытой дырке великоваты, но начиная с 24мм заметно снижаются, а с 30-33мм приходят в норму.