Archived posting to the Leica Users Group, 2015/11/15
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The B+W 093's work just fine, but the exposure is a couple of stops (depending on subject) longer than with the 092 or Leica's IR. Personally, the filters I prefer for IR on the M8 are the 715's or 720's. My most used are Helipan 715's. If you buy cheaper ones, the cutoff indicated often bears only a passing resemblance to what B+W or Heliopan would label them, and they vary a lot. Henning Wulff hjwulff at gmail.com On 2015-11-14, at 8:21 PM, Howard Ritter <hlritter at bex.net> wrote: > Right, and I did get the IR cut filters from Leica. But there is a native > IR filter over the M8?s sensor, even if an inadequate one, and my reading > indicates that as the wavelength increases, its effectiveness improves so > that it?s reasonably effective for the deeper IR. In fact, one source > indicated that there?s so little overlap between the low-end tail of the > B+W 093?s passband and the high-end tail of the M8?s that it?s > questionable whether the 093 would even be useable. But the same article > included an attractive hand-held M8 image done with the 093, so > apparently, at least in some situations, there?s enough. > > ?howard > > >> On Nov 14, 2015, at 9:15 PM, George Lottermoser <george.imagist at >> icloud.com> wrote: >> >> I believe the M8 IR filtration qualifies as minimal (to virtually non >> existent); >> which is why the M8 requires IR/UV cut filters "in front" of our lenses >> to achieve accurate color. >> >> So. The M8 already qualifies as extremely IR sensitive; >> as I understand it. >> >> a note off the iPad, George >> >> On Nov 12, 2015, at 10:34 AM, Howard Ritter <hlritter at bex.net> wrote: >> >>> I thought I had recalled that filter nomenclature from your last post, >>> George. If one wants to use the M8 as a dedicated IR camera, is it >>> possible/worthwhile to have the sensor IR filter removed? >> >> _______________________________________________ >> 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