According to Photozone tests. Sigma EX and Tamron SP lenses are very good. So is there any reason to buy Pentax lenses instead?
e.g. instead of DFA 100 2.8 macro, u could get the Sigma 70 2.8 M, 105 2.8 M or Tamron 90 2.8 M for less $. Instead of Pentax 16-45 f4, u could have Sigma 17-35 f2.8-4.
What do u guys think? Or put in the other way round, any reason NOT to buy Sigma n Tamron lenses.
e.g. instead of DFA 100 2.8 macro, u could get the Sigma 70 2.8 M, 105 2.8 M or Tamron 90 2.8 M for less $. Instead of Pentax 16-45 f4, u could have Sigma 17-35 f2.8-4.
What do u guys think? Or put in the other way round, any reason NOT to buy Sigma n Tamron lenses.