John
On Tue, 24 Feb 2004 11:58:50 -0600 (CST), <[EMAIL PROTECTED]> wrote:
Date: Tue, 24 Feb 2004 11:36:07 -0000 From: John Forbes <[EMAIL PROTECTED]>
Have any digital slr users experienced the sensor-reflection phenomenon referred to by Keppler?
Not that I'd know. Perhaps I would get 5% better performance if this phenomenon were eliminated but I'd never notice.
It's a bit worrying. I have been buying up lots of cheap (but good) old Pentax lenses on Ebay in anticipation of buying a *ist D.
Stop worrying! I've shot screw-mount takumar lenses on the *istD and they look great. My girlfriend's A and M lenses are quite sharp and contrasty with her *istD. If you absolutely have to have UNCOMPROMISED performance buy a Leica or a Hasselblad and shoot Fuji velvia all the time.
I have never seen a real sensor up close, but I wouldn't have expected them to be too reflective. After all, they're meant to read the light, not reject it.
It's not the sensor (film reflects light too--hence TTL flash) but the glass anti-aliasing filter in front of it. It too should be designed to transmit light but glass is never perfect--that's what SMC is all about.
It's one of those things that smack very much of hype in order to get consumers to buy new lenses, but at the same time it clearly could be true.
Lots of things can be done to optimize the performance of lenses for digital, so when designing such a DSLR lens it is prudent to do them.
In the meantime, lots of pros are getting stunning results using older lenses on DSLRs and not complaining about the possible 5% contrast loss from sensor-reflectivity or the 5% illumination loss from the light not coming into the sensor just straight at the edges.
DJE
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