Thanks for the detailed description and information. However, my question dealt with manual focus lenses. Aren't FA lenses auto focus?
Shel > [Original Message] > From: Herb Chong > not sharp enough. the FA 24-90 is one example. shooting Provia, it isn't > easily distinguishable from any other excellent prime or zoom like the FA > 50/2.8 Macro or the FA* 80-200/2.8. with Velvia, with good technique, it > shows a little less sharpness. on the *istD, the 1.5x crop factor turns a > very good lens into an average one. that's not good enough and i don't use > the FA 24-90 anymore except when i need a light set of 3 lenses to cover > from 16 to 320mm. if weight is less of an issue, i would rather carry the > FA* 28-70/2.8, or perhaps the set of 3 Limiteds and the FA* 80-200/2.8 and > the FA* 400/5.6. the FA* 24/2, of course, has the chromatic aberration i > don't like. i got rid of all my Sigma lenses, except the 12-24, for > sharpness, bokeh, and chromatic aberration reasons. the 12-24 shows all of > the above effects, but not to the degree of the other Sigmas. if there were > a Pentax 12mm, whether prime or zoom, i would replace the Sigma. the DA > 14/2.8 isn't sharp enough for my liking. > > none of these conclusions of mine are based more than seeing the effect of > the 1.5x crop factor of the sensor. i don't have single examples to show of > any of these. they are the results of observing my best lenses on both film > and digital bodies and seeing which of my lenses are the worst with each. > anything too much worse than my best, i put away, like the 24-90, waiting > for the occasional roll of film i shoot, or for the day a full frame digital > from Pentax finally arrives, or i sell. > > the FA 50/2.8 Macro, FA* 80-200/2.8, and the DA 16-45/4 are my benchmarks. > if i can look at a 100% image from any other lens and can see a sharpness > difference immediately, then it's not good enough. if i have to compare > carefully to see a difference, then i keep the lens. wide open performance > isn't as critical as f8-f11 performance. since i am almost always on a good > tripod system, vibration movement isn't an issue. > > Herb... > ----- Original Message ----- > From: "Shel Belinkoff" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Monday, February 21, 2005 4:24 PM > Subject: Re: Manual Focus Pentax Glass on istD > > > > In what way aren't they acceptable? Can you provide an example? >
