Archived posting to the Leica Users Group, 2008/06/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Jun 17, 2008, at 2:22 PM, Geoff Hopkinson wrote: > Steve, we look forward to seeing results from your testing. Happy to share my images with you Hops, though my testing in a rigorous, proper scientific way is not too likely... I know what that involves to do it right, and I don't want to spend my time that way... however, always putting the equipment to good use, taking pictures, evaluating results and outcomes, learning from that, making changes... that I will do... Come to think of it, that's an experiment too, long tried in nature, it worked fine...it's called evolution... Steve > 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 > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information