I'm sorry but I can't help... since I have both the Pentax DA* 16-50mm
. Both are really outstanding lenses.
One hint: consider
instead of the 50-135mm.
Aperture is f/4 instead of f/2.8 but the K-7 can easily cope with that, and you get incredible
telephoto zoom. Remember: 250mm is actually 250 x 1.5 = 375mm
I know budget is also a good decision-maker
Pentax K-5 + BG4 + DA* 16-50 + DA* 50-135 + DA* 60-250 + AF-540FGZreivilophotography.weebly.com