[pure-silver] Re: Gigabitfilm -> digital / film resolution
- From: Georges Giralt <georges.giralt@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 25 Feb 2005 16:39:59 +0100
Jim MacKenzie a écrit :
> ----- Original Message -----
> From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Friday, February 25, 2005 9:01 AM
> Subject: [pure-silver] Re: Gigabitfilm
>
>
>
>>3) Lens faults are emphasized because of the lack of grain in the
>>negatives. In fact, unless you have a really high quality lens, your
>>prints will appear less sharp than if you had used a conventional film
>>such as Efke 25.
>
>
> This has always made me ponder how digital SLR images could possibly be
> better than 35mm when the photographers are only using a portion of the
> image circle and only getting a proportion of the resolution of the lens.
> (Different story with full-frame cameras I suppose.) If the digital
> photographers are right, then 35mm film can't possibly record all the
> resolution of a lens and photographers may be overpaying for quality. If
> film can record the resolution, then digital photographers are missing
> something because their sensors can't possibly outresolve film using the
> same lenses.
>
> Jim
>
Hi !
Without going OT...
Digital sensor can't get the best of the lenses only if such lens has
outgoing rays perpendicular to the sensor surface (which is made of
"holes") if the rays are at an angle, there is some loss which cause
diffraction and various artifacts effects causing great resolution losses.
This is why there is a different lens for digital photography and silver
photography.
Film does not suffer this behavior, so a good "digital lens" of proper
coverage should give very good results with film. But, as digital sensor
have an APS size (for most) coverage and even illumination is calculated
for this sensor size therefore not covering 35 mm film.
Going digital also involve changing a set of fine expensive lenses...
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