At 09:47 AM 6/27/2003 +0800, Chi-hung Yeung wrote:
>Dear All,
>
>Do anyone knows whether it is possible to use the old OM lenses on the E-1
>digital SLR. If the answer is negative, are there any reason to stick with
>Olympus? The other brand names allow the use of their lenses across the 35 mm
>and digital SLRs.
The answer is "no," at least according to available information.
That said, the lenses on the new E-1 appear to be *specifically* designed to
deal with the issues of imaging on CCDs -- making the E-1 the very first DSLR
to deal with that issue head-on. All other manufacturers allow the use of
lenses designed for film on their DSLRs, which may compromise image quality,
particularly as you get toward the edges. CCDs form images best when the light
rays falling into their wells are nearly perpendicular to the well, a condition
which is violated when using lenses designed for film. A buddy of mine who is
a commercial photographer has noted this problem with his DSLR, and has even
built a special Photoshop filter to try and partially compensate for this. He
finds it manifests itself as a distinct colour shift from the centre of the
image out to the edges.
In an e-mail exchange he and I had a while ago, I mentioned that Olympus was
re-designing lenses for their DSLR, and this was his response:
"The biggest problem with my (and other) digital SLR(s) is a weird and poorly
understood lens-CCD interaction where there can sometimes be a colour shift
with the centre of the frame being magenta and the edges green. It becomes
visible in high flare situations with a continuous light toned background.
It's both less strong AND more camouflaged in all other situations, so can
normally be ignored or is "under the threshold of detection."
Moving the rear lens element away from the CCD and making the light approach
the film as perpendicularly as possible is the solution, which doesn't help
with existing lens designs that often have the rear element very far back
[towards the image plane]."
He included a map of the colour shift that his DSLR (a Fuji FinePix S2 Pro
using Nikon lenses designed for film) was exhibiting, which I've posted here:
http://www.telusplanet.net/~garth/shiftmap.jpg
That's quite the colour shift!
If the E-1's specifically-designed lenses overcome this issue, it'll be an
important step forward for DSLRs, and in a very real sense, will put Olympus at
the head of the pack, at least until other manufacturers step in line and
re-design *their* lenses.
Garth
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