Originally posted by Damian.T Why a Tamron 17-50 2.8 compared to 18-135mmWR that tempts me?
For a walk around lens the 18-135 WR is an excellent lens, and since I have both, if one has to stay home it's the Tamron. The 18-135 is just an great lens that hits over it's weight in many circumstances. But for landscape the 17-50 is sharper edge to edge at every focal length. You can never underestimate the advantage of having your walk around lens cover both wide angle and 50-135, even if it's only centre sharp. A lot of the time, centre sharp is all that matters.
The thing that the 17-50 has going for it is you already have 55-300 covered, so now you can start looking for excellence in lenses. But the 18-135 is good enough @ 24mm to beat almost any other Pentax lens. So it's worth buying just for it's performance at 24mm. The lens that beats it is the Tamron 17-50 which will outperform it at it's best. (and everywhere in it's range.)
WIth the 18-135 you don't have to change lenses as often, and that can be very convenient.
I would have liked a longer lens for this shot.... but 135 did just fine, time wasted changing lenses would have certainly meant I didn't get this shot. There might be something wrong with the edge sharpness of this lens @ 135 but the middle is excellent.
Last edited by normhead; 02-20-2013 at 08:02 PM.