Re: Digital ISO; lens optimization)

[SteveS <sgshiya@xxxxxxxxxxxx>]

The digital 'film plane' or exposure chip is flat, the normal film lens 
sends a cone shaped beam of light to the back, or film plane.  Digital 
lenses are ground so the 'beam of light' is sort of like a rolling pin, or 
straight back at perpendicular angles to the capture-chip. (or whatever it's 
called)

I spent a few hours talking to a lens designer at the gallery where I once 
worked.  Yeah.  They're different.

Or, the camera manufacturers have shaped the light capture surface to 
compensate for their film lenses.

S.
----- Original Message ----- 
From: "Greg Fraser" <fraserg@xxxxxxxxxx>
To: "List for Photo/Imaging Educators - Professionals - Students" 
<photoforum@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Saturday, January 29, 2005 11:22 AM
Subject: RE: Digital ISO (actually now lens flare and optimization)


> ----- Original Message -----
> From: "Eclipse Agency"
>
> : What about lens flare and such? The article gave a few reasons how
> digital
> : lenses are optimized.
>
> When I first heard of so called 'Digital' lenses I said 'yeah right'. But
> the thing that caught my mind as being a possibility was not so much flare
> from outside light sources per se but rather the light reflecting off the
> sensor and back towards the lens and then reflecting back into the sensor
> etc. Supposedly the digital lenses have more anti-reflective coating to
> prevent that. I'm no expert like Vlad, but that sounded plausible to me.
>
> Greg
>
>
>
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