Pentax SMC-DA 17-70mm F4 AL IF SDM

Pentax's Best Midrange Zoom

Make it a little faster, and add weathersealing and you could put a DA* in its name and double the price. But the fact is it has the same SDM Drive system the most expensive Pentax lenses have and it just flat out is consistently better, corner to corner, than the more finicky 16-50mm DA* that can...