Hi Keith, So after reading many opinions about bokeh it can be truth what I wrote that in some conditions I could see bad bokeh using K105/2.8. MAybe I chose them in such a way that it was quiete nice.Maybe in other ones bokeh could be harsh. But in general this lens is very sharp and contrasty. Alek Użytkownik Keith Whaley <[EMAIL PROTECTED]> napisał: >Well espoused, Mike. I'll look forward to the write-up with enthusiasm! > >keith > >Mike Johnston wrote: >> >> > This is an interesting idea: Could the choice of background *and* distance >> > from main focus of interest in a photograph be more of an influence than >> > lens design in the perception of "bad bokeh"? >> >> Tim, >> In my researches (don't ask), a number of things affect the bokeh: lens >> design, aperture shape, aperture setting, focusing distance, distance of the >> background objects from the plane of focus, and the contrast, illumination, >> and edge texture of the out-of-focus objects. >> >> IN GENERAL, the worst-case bokeh is found for most lenses a) at wider >> apertures, b) closer focusing distances, c) with distant out-of-focus >> objects d) when those objects are well illuminated and have high contrast. >> >> So you can deduce that most lenses to do relatively better when stopped >> down, focused farther away, with low-contrast and/or darker objects not so >> far in the background. Also, objects with indeterminate or ragged edges will >> often appear smoother as long as they're sufficiently o-o-f. You can >> actually see this effect in pictures where you may have one hard-edged >> object at the same distance as much softer subject matter, like a bright >> metal pipe against a muted brick wall or a light-colored streetlight pole >> against a mass of foliage. In those cases, where the brick or the foliage >> might be perfectly unobtrusive, the harder shape can show more obvious >> _ni-sen_ or "double-line" effect. >> >> I'm going to do a column on Luminous-Landscape about testing lenses for >> bokeh, including illustrations that will greatly help clarify the issues, >> but it's going to be a lot of work to prepare and I don't know when I'm >> going to be able to get around to it. Hope this helps somewhat in the >> meantime. >> >> --Mike > --------------r-e-k-l-a-m-a-----------------
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