PentaxForums.com - View Single Post - Chasseur d'Images test of 20 Pentax lenses on the K20D

thibs · 05-21-2008, 02:19 AM

Here are the tested lenses and a couple comments about those:

DA17-70 SDM

*Vignetting visible at 17mm and 70mm where you need to close aperture two notches to eliminate it.

*First half of zooming range gets chromatic aberation of red/blue fringes, very visible. It is THE drawback of that lens. Not better than 16-45 it seems on that point.

*Distortion: very noticeable until 21 where it becomes less intrusive and is pretty workable.

*Sharpness: performance level exceptional until 50mm where it goes down, especially wide open.

Overal: global quality and potentional a lot better than kit lens (18-55). SDM brings silence and reactivity and weather sealing is a nice add. Very good 'expert' choice.

weight: 485g
filter thread: 67mm
Price: not communicated.
Minimal focussing distance: 28cm
Dimensions: 75mm x 94mm

Rating: 4 stars out of 5.

05-21-2008, 02:19 AM	#13
thibs Pentaxian Location: Nivelles, Belgium Gallery Photos: 0 Posts: 1,598	More details: DA17-70 SDM Here are the tested lenses and a couple comments about those: DA17-70 SDM Vignetting visible at 17mm and 70mm where you need to close aperture two notches to eliminate it. First half of zooming range gets chromatic aberation of red/blue fringes, very visible. It is THE drawback of that lens. Not better than 16-45 it seems on that point. Distortion: very noticeable until 21 where it becomes less intrusive and is pretty workable. Sharpness: performance level exceptional until 50mm where it goes down, especially wide open. Overal: global quality and potentional a lot better than kit lens (18-55). SDM brings silence and reactivity and weather sealing is a nice add. Very good 'expert' choice. weight: 485g filter thread: 67mm Price: not communicated. Minimal focussing distance: 28cm Dimensions: 75mm x 94mm Rating: 4 stars out of 5.