Originally posted by bdery I wuold if I didn't already have a 16-85...
for me, extra large apertures are for primes. Convenience is for zooms. And the 16-85 is perfectly good wide open, while fast lenses are often so-so until you close down about a stop, making them not almost as "slow" as the 16-85.
Especially now that I have the high ISO performances of the K-1, super speed is not a requirement.
Confirm that.
Before I purchased the K-1 I ordered the 16-85 and the 28-105 and compared them vs. the Tammy 28-75. Guess what... the Tammy was the sharpest under all conditions except 2.8 (which some consider THE unique sales point) , 16-85 was slightly behind and the 28-105 could not hold up.
Comparison done on K3II.
The old Pentax 24-90 I got 2nd hand these days... it renders nicely on the K - 1 but sharpness does not reach the level of the 28-75. If stopped down it comes close to the other 2 new lenses, anyway it's a lens of the film era and still good for not too detailed landscape, every-day-use, light travel and portrait (!)
This, of course, can only be a subjective impression of mine, no scientific approach... 😉
And lenses, as we learned earlier, can vary a lot due certain manufacturing process reasons...