Based on your experience Carlos, and mine with a 3mm chip on the friont
element of a somewhat less exalted 18mm, I think we can agrre, and
generalize that the further awy from the film plane, and the shorter the
focal length of the lens, the greater will be the problem. Certainly, in my
case the chip (which was filled with black ink to cut down the zillion
specular highlights whioch were otherwise evident) was easily visible from
f/8, and by f/16 it was sharply focused! The lens was an 18-28 Phoenix zoom,
so the front element was maybe 10cm from the film plane. I suspect the
Distag is a smaller overall size.
Chips on a telephoto? Don't worry.
Chips on the rear element of a wide angle? Probably won't notice.
Scratch on the front element? Try not to fill the scratch with black ink -
there may be image 'damage', but it will likely be less visible than the
black ink!
HTH
Piers
-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
On Behalf Of Carlos J. Santisteban Salinas
Sent: 13 October 2003 19:04
To: Lista de correo Olympus
Subject: Re: [OM] Fang? We'll see when it gets here
Hi, all.
>I think marks on the front of a lens probably affects
>the price a lot more than its ability to take pictures.
That's the usual consensus. However, I think that for *super-wides* the
*opposite* is true -- marks at the rear element will have little or no
effect on performance, but any flaw at the front may show up easily.
I once hitted the front element of a Cont*ax Distag*n 18mm F4, and the pics
clearly showed a spot where the nick was, when stopped down to f/11 or so.
On the other hand, my Zuiko 21mm F3.5 has an ugly scratch at the dreaded
rear element (see it at
<http://www.supercable.es/~santis/etc/scratch.jpeg>), and I'm really happy
with its picture quality. Haven't used an uncratched one, though.
Back to the 28mm question, I think that a not-so-wide lens of very short
barrel won't have any problems with a scratch at the front. I like the Zuiko
28/3.5, too.
...
Carlos J. Santisteban
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