Pentax smc DA* 60-250mm F4.0 ED (IF) SDM
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Pentax smc DA 60-250mm f/4.0 ED (IF) SDM Lens Review
By: What Digital Camera (Feb 19, 2013)
Overall this is a very capable lens but it is also a costly one. Photographers who genuinely need its f/4 constant maximum aperture and weatherproofing measures will doubtless be willing to invest in a lens of such quality but others may rightly hesitate. More importantly, potential buyers who are using older-generation Pentax digital bodies should definitely check the zoom's performance on...
Review of Pentax 60-250mm f/4 ED IF SDM SMC DA*
By: SLR Gear
Optically, the Pentax 60-250mm /4 is a winner: with excellent results for sharpness, even wide open, low amounts of CA and virtually no light falloff or distortion, it's an easy decision if you're already considering this lens and just needed to know whether or not it performed.