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Forum: Pentax SLR Lens Discussion
07-20-2017, 06:26 PM
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I use the K3-ll and Sigma 70-200mm F2.8 MKll for motorcross/dirtbike racing and it's a great combo. AF is fast with AF.C and continuous shooting Hi gives great frame rate, and i use spot focus.
I'm waiting to see if the K1 MK2 has a faster frame rate, as I want better than 4 frames a second before i go full frame.
For fastest frame rate go K3-ll, or wait to see what an updated K1 and K3 offer. AF speed should be similar on the current K3-ll and K1 with any 70-200mm F2.8. ( Which is around the 105-300mm on a K3-ll)
Don't have the 50-135*. but from what i've read, It has slow AF. So you should get better AF with any 70-200mm F2.8 over it.
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