Originally posted by Art Vandelay II These studio tests are great and all, and in ideal conditions when mounted on a tripod yes the Pentax 55mm looks better at 1.4, but in real world shots with a moving subject I seriously doubt anyone would notice the slightest difference unless you are either doing some serious pixel peeping or making extremely large prints. Focus mistakes will come into play more then lens flaws.
Besides, the point was not which lens is better, it was that both have about the same specs, similar build quality, similar results, similar release dates, but Pentax has chosen to charge $200 more for theirs.
These companies are just very inconstant across the board. It's odd. Here is an example in Pentax's favor comparing prices between the Pentax 16-50mm 2.8 and the Nikon 17-55mm 2.8. The Pentax lens is $500 cheaper!
Yes, No, Maybe.
Yes the difference is not massive, But there is a difference, that difference cost more money to build IMO.
I love printing big.
I often crop. Having an extremely sharp lens at max aperture is useful when printing even A4 when you crop.
Sometimes static subjects need 1.4 also or studio portraits. Being able to see every fiber/pore/wrinkle is very nice.
I can not afford it at the moment, But I hope to be able to in the next year.
The 16-50 is a running joke for Pentaxians. One minute its praised, the next it can not focus and looks fuzzy down the side. I so wish they would bring out a version II of that lens at the same price. Same for the 50-135, the motors burn out. The rest of our DA* line is a shining example of what Pentax is capable optically and mechanically.
Anyway, back to my point. Simply put I think the lens is almost worth its money. Not so for the Nikon, the Sigma smokes it!!! Now, Pentax vs Sigma in K mount.....
Anyway again, I think if Nikon made a lens as good as the Pentax they would be able to charge the extra money, but they did not in this instance.
We do not even know how much the cost to make these lenses is. If Pentax made a lens from better parts to increase performance then they should charge more. But we do not know really. Now I am off to bed..... Nice chatting.