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Need help understanding CDAF and if a lens makes a difference

Started Oct 4, 2015 | Questions thread
OP AndrewJ Regular Member • Posts: 232
Re: Need help understanding CDAF and if a lens makes a difference

Thank you all very much for the advice. I'm excited to give it another go. Her next tournament is next week on Monday and Wednesday. In three and a half weeks the season is over so I need to commit to a lens purchase soon.

Am I better off buying the Tamron being a new lens? $8-900 is all I'd like to spend for now. I believe I still have a credit with Amazon for $360 so the Tamron may be a no brainer but being a novice will the slightly faster autofocus of the Sigma (on a K3) help? This is assuming I can locate one and the only reason I'm thinking about it is around the autofocus advantage that in reality may not be enough to matter.

 AndrewJ's gear list:AndrewJ's gear list
Pentax K-3 Pentax smc DA* 50-135mm F2.8 ED (IF) SDM Tamron AF 28-75mm F/2.8 XR Di LD Aspherical (IF) Pentax smc DA 35mm F2.4 AL Pentax smc DA 50mm F1.8 +1 more
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