[LRflex] Re: Tale of Two Telyts Part Deax - The Evil Twin
- From: David Young <telyt@xxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Thu, 06 Jul 2006 08:50:41 -0700
At 06/07/2006, you wrote:
>Folks -
>
>As promised, here's an example of a disturbing symptom I encounter
>occasionally with the 400 Telyt.
>
>Here's a snap of a blue heron impersonating a stick:
>
>http://gallery.leica-users.org/album409/Camoflage_Heron_Crop
>
>
>And here's a 100% pixel crop showing heavy purple fringing around the
>feet and along the top edge of the log (in areas of serious
>overexposure):
>
>http://gallery.leica-users.org/album409/Camoflage_Heron_PurpleCrop
>
>
>I've seen the same effect on Kodachrome, so I don't think it's one of
>those artifacts of digital sensor architecture (despite all the talk
>you hear about purple fringing in digicams.) My questions are as
>follows:
>
>1. Is this just a classic case of chromatic aberration in a simple
>achromat? (I hear tell that the Anomalous Dispersion glass (whatever
>that is) in this design is supposed to control this kindof thing to a
>pretty acceptable level.)
>
>2. If so, is it really possible that the results in the normally
>exposed areas can look as good as they do (not that this snap is the
>best example; things were getting pretty dim at the time and the
>shutter speed was probably quite low) with a level of CA this high?
>
>3. Does someone who uses both this lens and the probably staggeringly
>CA-free 280 APO (Doug??) ever see this effect in their 400 shots and
>not in those shot with the APO ?
>
>Inquiring minds want to know...
>
>Bob Palmieri
Hi Bob!
First of all, let me say that the first shots you showed with the 400
were absolutely excellent!
Secondly, I get the same problems with my 400 Telyt... though I seem
to have it more often since I switched to digital. This may,
however, have a lot to do with taking a lot more shots once I had the
digital! Like you, I've seen it on film, as well.
It seems to occur mostly in areas of high contrast.
What bothers me most, is that various programs (PS-CS2, Silkypix and
others) all have a method built in to combat this.... but while they
will all reduce the CA problem a bit, none will cure it.
Anybody out there have a cure or know the exact cause?
Now, two enquiring minds want to know!
Cheers!
---
David Young,
Logan Lake, CANADA
Personal Web-site at: http://www3.telus.net/~telyt
Limited Edition Prints at: http://www3.telus.net/~telyt/prints.htm
Leica Reflex Forum web-page: http://www3.telus.net/~telyt/lrflex.htm
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