Archived posting to the Leica Users Group, 2006/07/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Can't help you with your technical questions, but -with this title- wouldn't tis one look great in a (slightly warm grey toned) B&W? Just an idea. Thanks for showing, Philippe Op 6-jul-06, om 17:41 heeft bob palmieri het volgende geschreven: > 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 > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >