I am pretty sure the amount of correction for spherical aberration plays
a big part. Overly corrected lenses, while sharp in the focus areas,
give unpleasantly harsh bokeh. This is another way of saying what you
are saying, Vic.
I like soft-focus lenses for this reason.
D
Vic Mortelmans wrote:
A while ago I read an extensive article on the web about bokeh. If I
remember right, much boils down to the the form that the aperture
blades take when stopped down. The more blades there are, the more
you'll reach a perfect circle of 'diffusion'. That's already a step
ahead towards nice bokeh.
Another aspect may be relative brightness of the diffuse light towards
the centre or the edges of the circle. No idea which parameter
controls that... probably general lens design issue.
It may be just a wild idea, but I have the feeling (not supported by
too much experience) that the simpler a lens is on the optical design,
the nicer the bokeh. A lens that is tweaked and forced to perform with
high speed and high sharpness in a compact barrel is probably bound to
perform weaker when bokeh is coming into the picture (i.e. out of focus).
Saying this, my first hint would be to go for prime lens, not too
fast, maybe a nice Takumar. Aside from that, digital lens may be good
as well, since those lenses are less glass in the same housing, which
allows a more simple optical design.
Note, this is even not two cents worth...
Groeten,
Vic
Leon Altoff wrote:
Hi all,
I'd like to try and find some information on the bokeh of lenses
before I go out and buy one. Apart from asking on the list if any
one has an example of the bokeh produced by a particular lens, are
there any sites with examples or listing lenses with good and bad bokeh?
In particular I've been thinking of getting a 300mm lens for use with
birds and similar small wildlife - ideally I would like a super sharp
100 - 300 f4 constant zoom (possibly optimised for digital to make it
lighter). Sigma make one and I was thinking of it (you can't find it
in any camera stores in Australia to try first - at least I haven't)
until I saw an image taken by one of the list members, which I
thought had some rather nasty bokeh.
So how do you find lenses with good bokeh before going out and buying
them?
Leon
http://www.bluering.org.au
http://www.bluering.org.au/leon
Norman Baugher wrote:
To answer the question - use a lens that produces good bokeh?
Norm
From: "Tim Øsleby" <[EMAIL PROTECTED]>
Gonz is onto something when he points at the harsh bokeh. So now I
wonder:
Is there anything I can do to make it less harsh in Phootoshop
(Elements 3)?
Gaussian Blur is one obvious answer. It helps, but it does not take
it right
where I want.
Does anybody have some input on this?
--
[EMAIL PROTECTED]
http://members.iinet.net.au/~derbyc
