Archived posting to the Leica Users Group, 2008/06/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Steve, we look forward to seeing results from your testing. Peter's examples are certainly a worst case. If you are querying sharpness as well as tonal shift, you will be considering other factors too, in order to reduce variables (DoF, focus accuracy, focal distance, focus shift, camera and subject movement, aberration level at large apertures with different lenses). I just shot some available light family shots. Black T shirts against black cloth partitions under mixed artificial light. The well known magenta shift makes a marked difference in tonality of the blacks after BW conversion (and some to the skin tones). Similar but less predictable effects on various metal or plastic objects (it was an invention convention for school kids). Shots made experimentally removing the filter were noticeably degraded. Cheers Geoff http://www.pbase.com/hoppyman/e http://gallery.leica-users.org/v/gh/ -----Original Message----- Subject: Re: [Leica] How IR filters affect M8 B&W On Jun 17, 2008, at 7:34 AM, Tina Manley wrote: > At 02:20 AM 6/17/2008, you wrote: >> All other things being equal, I prefer to use the IR filter while >> shooting B&W with the M8. However, I have noticed that you can >> often gain a half stop more exposure without the filter, especially >> in reddish tungsten light. So if I was shooting at 1/15 or slower, >> I might remove the IR filter, figuring that the half-stop faster >> shutter speed I'd get might gain me more in clarity than the IR >> smearing would take away. >> >> --Peter > > That's very helpful, Peter, and a greater difference than I thought > it would be. Guess I need to get a couple more filter sizes :-( my thoughts too Tina but, I am not totally convinced yet, but almost...just need to see this reproduced and carried a bit further, Steve > > > Tina > > Tina Manley > www.tinamanley.com > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information