HI Barry -

I have an older version of the Tamron - the 90mm f2.8 auto focus - and the DFA Pentax 100mm Macro (non WR). Both are excellent lenses but the biggsest difference I notice is the the Pentax has the quick-shift focus adjustment which makes manually fine tuning focus very quick and easy. With the Tamron I have to both pull the lens focus ring back to put it in manual focus mode *and* disable AF on the body. The two step process if very clunky (would be better to be able to juse disengage AF from the body.) Like I said, I have the film era Tamron lens, maybe the latest versions offer something more like the Pentax quick shift. To me that would be a significant issue.

Optically both lenses seem to be excellent, though I bought the Tamron last year to use with film bodies and have not really tested it with a digital body.

Mark

On 6/16/2014 10:04 AM, Barry Rice wrote:
Hey Brian,

Thanks for  your input. You answered what was perhaps my most critical
question. Good to see that Tamron has graced Pentax with a dedicated model,
instead of just Canon and Nikon.

How does the focus on the AF Tamron feel?

Barry

Barry Rice, Ph.D.
Sarracenia.com





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