Can't agree on the highlight problem as bad bokeh not only seen on highlight
area but everywhere of the OOF foreground/background. USM is 'almost' not
necessary with good digital back and sharp lenses.
C.H.Ling
----- Original Message -----
From: "Ken Norton"
>> I concur with this, I do not believe that the nature of the capture
>> medium
>> could have any effect on the bokeh, just as it cannot have any effect on
>> resolving power, unless somebody proves otherwise to me.
>
> As you'd expect, I don't agree with this. I believe the capture medium
> has
> quite a bit of bearing on bokeh characteristics.
>
> 1. Digital sensors have their own inherent flare which is easily seen with
> ultra-bright spots within the image. Film has a uniform lateral halation
> in
> all directions (ie, blob), whereas you will get a multibladed "fan" as a
> result of the physical nature of the sensor and microlenses
>
> 2. Film is "self-attenuating", in that the straight-line response section
> of
> film is relatively short and the toe and shoulder is long. Digital has
> little to no self-attenuation and the straight-line section is much longer
> in comparison. This causes OOF highlights in digital to actually be
> brighter
> than they are in a comparable film image
>
> 3. Microlenses, again... The MF digital backs are nearly always designed
> without microlenses as there is a very distinct change in the images. I
> could cite song and verse on this, but a google search such suffice. The
> MF
> back makers found that it is better to correct vignetting in software than
> it is to throw microlenses on the sensor
>
> 5. USM-based stepping in the penumbra. (2*:* a surrounding or adjoining
> region in which something exists in a lesser degre*e). When you take a
> gentle falloff and apply USM to that falloff, you can get one or more
> distinct steps.
>
>
> I have noticed a distinct difference in the bokeh from my 100/2.8 in film
> and digital. Even when I account for the cropped format by the difference
> is
> clear to see.* **The 100/2.8 has buttery smooth bokeh on the film images,
> but has a busy, raspy look on the E-1/.
>
> AG
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