Originally posted by audiobomber Copy variability is high in all of these consumer zooms.
I would hope that goes without saying, but there are some consumer lenses that don't seem as "variable" (I'm thinking of the DA 55-300, but there are probably others). Also, the DA*16-50mm isn't exactly a consumer zoom, but it's just as "controversial" when it comes to QC and copy variability.
The whole point isn't that the DA 18-135 is a bad lens, or should be slagged because it's (possibly) a Tokina, but rather that some folks might make a different purchase decision based on who designed and manufactures a lens, despite the label on it. In this case they could stick with a two lens kit, forgo WR, maybe save up for a constant aperture zoom... lots of things! But just looking at labels, I've noticed how the Pentax badged lens is normally considered to be "a safer bet" in the face of these variables. (Heck, some people won't even buy the Samsung rebadges of well-known Pentax glass like the FA 35/2 or DA 10-17! Most common reason I've read:
resale value. Then the idea perpetuates itself!)