PentaxForums.com - View Single Post - DA 17-70mm f4 sdm

asdf · 01-20-2009, 05:02 AM

Originally Posted by crispy0009

Not to beat a dead horse, but what is the consensus?

That the kit lens is softer or the 17-70mm?

p.s. : sorry if you feel we've gone over this enough.

The kit lens is definitely softer at 50mm, f/5.6. With 17-70, you can see jaggies at the edges of letters--at least on K200D's sensor. The kit lens is more anti-aliased.

Doing accurate sharpness tests requires some care (when I was doing the shots above my tripod setup wasn't steady--I didn't intend it to be a sharpness test--but the difference was still noticeable):

Mirror Lock-Up

Also, telephoto ranges magnify any existing vibrations.

You can check out photozone.de's reviews--even if they're not very careful, you can at least compare how the lenses perform under the conditions they set up.

01-20-2009, 05:02 AM	#29
asdf Loyal Member Location: Canada Gallery Photos: 0 Posts: 596	Originally Posted by crispy0009 Not to beat a dead horse, but what is the consensus? That the kit lens is softer or the 17-70mm? p.s. : sorry if you feel we've gone over this enough. The kit lens is definitely softer at 50mm, f/5.6. With 17-70, you can see jaggies at the edges of letters--at least on K200D's sensor. The kit lens is more anti-aliased. Doing accurate sharpness tests requires some care (when I was doing the shots above my tripod setup wasn't steady--I didn't intend it to be a sharpness test--but the difference was still noticeable): Mirror Lock-Up Also, telephoto ranges magnify any existing vibrations. You can check out photozone.de's reviews--even if they're not very careful, you can at least compare how the lenses perform under the conditions they set up. Last edited by asdf; 01-20-2009 at 07:14 AM.