Originally posted by RioRico I cover much of this in my article pentaxforums.com/forums/pentax-lens-articles/152336-cheap-macro-buying-exploiting-lens-ultraclose-work.html -- and I didn't bring this up here before because the question wasn't about doing macro cheap, but whether Pentax is likely to enter the budget-macro-lens market. All lensmaking requires compromises. Alas, AF macro lenses require contradictions. Quality macro work can be done ultra-cheap. Quality AF 'macro' lenses CAN'T be built real cheap AFAIK. Or at least they aren't. If they were easy to make, everyone would be doing so.
Enuff of the self advertisement please...
I have to say your latter statements are pretty sweeping and unsubstantiated.
What contradictions are you talking about with regards to AF macro lenses? Please highlight them for us.
FYI, the no-longer-made plastic fantastic Vivitar/Sears/Pentax FA 100mm f/3.5 Macro is a decent lens for the price. It offered 1:2 magnification on its own and 1:1 with the close-up diopter and this lens was made in both MF and AF versions. Yeah it only has a simple 4 element construction, looks like crap with the cheap plastic build but it does give decent images for the price and it had AF. Sure it is hopelessly outclassed by other better performing AF macro lenses but that's to be expected given it's cheap and cheerful price point. I certainly got good images from my copy.
Perhaps you should try using current modern AF macro lenses offered by Pentax/Sigma or Tamron before making up such claims.