Digital BW, The Print

It's releated to the shape of off-focus highlights, as they tend to adopt the 
outline of the aperture disphragm. 

The most extreme example of this effect is the dougnut-shaped highlights from 
mirror lenses thanks to the central secondary mirror.

With conventional lenses it's not when the lens is used at full aperture that 
counts but at smaller apertures.

Lenses with "better bokeh" tend to have more blades in their aperture 
diaphragm, making the outline more nearly a true circle. 

On Wednesday 30 Jan 2002 9:49 pm, tomoc wrote:
> So what's the difference in Bokeh and "normal depth of field"
> characteristics? I thought all optics pretty much had the same depth
> of field range at the same f/ stop? There might by huge differences
> in resolution and contrast and flare and general sharpness, but isn't
> the depth of field a matter of physics that is constant???
>
> Tom O'Connell
>
>
> --- In DigitalBlackandWhiteThePrint@y..., Jerry Olson
>
> <jerryolson@r...> wrote:
> > I don't really consider bokeh in my photos. I don't think I've ever
>
> used
>
> > any of my lenses wide open, as I'm always looking for maximum
>
> sharpness
>
> > throughout the image.
>
>
> Please visit the Group Homepage to check the Files, Bookmarks, Polls and
> other resources as they are often being updated. The page is at:
>
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
>
> Please follow these basic guidelines:
> - Include your full name with your message.
> - Include the address of your website, if you have one.
> - As threads develop, trim off excess portions of earlier messages to keep
> them short. - As the topic of a thread changes remember to change the
> subject header. - Good manners are required at all time. No personal
> attacks or "flames." - Complete your Yahoo profile.
> - Before posting a question, search the message archives and the various
> resources on the homepage.
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/