Andrew,
to the best of my knowledge, a real telecentric design, especially with
wide anges, requires a large mounting flange.
The flange for the four/thirds system being in fact as large as some
flanges for traditional 35 mm cameras.
For sure this gives more freedom to the engineers in designing new
lenses.
Or is Olympus simply reserving the chanche to use larger sensors?
Alfredo
On Aug 24, 2005, at 2:28 PM, Andrew Dacey wrote:
>
> There's been a lot of discussion on the list lately regarding
> telecentric lenses and the debate over the performance of wide angles
> on a full frame sensor vs. a smaller sensor.
>
> I understand the principles of telecentric design, a digital sensor is
> not as sensitive to light hiting it at an oblique angle (compared to
> film) so you want your lens to be designed so that the light strikes
> the sensor as close to perpindicular as possible across the entire
> frame.
>
> What I'm wondering is why isn't this possible with a full frame (35mm)
> sensor? Is it simply a size concern? I know that Tamron (and likely
> others) has their Di series of lenses and I believe that part of that
> design is to make the light rays hit the sensor at more of a
> perpendicular.
>
> In other words, is it the case that telecentric lenses covering the
> 35mm frame can't be made for a 35mm sized body/mount or is it just
> that there haven't been any (many?) released to date?
>
> If it's just a matter of them not being released yet then I'd say we
> should expect to see C*n*n release more telecentric designs now that
> they've introduced a full frame sensor in something other than their
> flagship body.
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