Originally posted by Dan Rentea I also know very well the 50-135mm f2.8 lens and also the Tamron 70-210mm f4 lens and I'm confident that the Pentax 70-210mm f4 lens is better both optically and in terms of af speed.
Originally posted by Rondec I think any of the recent lenses with their DC/ring/PLM motors is faster than the old SDM motors which were in the original DA * lenses. The 50-135 and DA *55 are the worst culprits, but the others were pretty slow.
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I used on the fantastic K30 a lot of DA * 50-135 / 2.8 for all kinds of manifestations, an optically phenomenal lens, if the DFA 70-200 / 4 had the same optical characteristics and a decisive and fast focus / much faster than DA * 50-135 / 2.8 and not crawling all over the range as with FA 80-320 / 4.5-5.6 this will be the dream come true of every Pentaxianer for that range
K30+50-135/2,8
K30+80-320/4,5-5,6 (silver)
K1+80-320/4,5-5,6 (silver)
so these two (DA50-135 + FA80-320) with optical features in one but with significantly improved features in the form of faster and decisive focusing packed as a DFA 70-200 / 4 is my wish and I think most Pentaxians, hallelujah