Archived posting to the Leica Users Group, 2012/12/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]No reciprocity failure in sensors as far as I know. Aram -------------------------------------------------- From: "Ric Carter" <ricc at embarqmail.com> Sent: Friday, December 07, 2012 9:22 AM To: "Leica Users Group" <lug at leica-users.org> Subject: Re: [Leica] Big thick ND filters...... > don't we expect those changes from reciprocity failure during long > exposures? > > That would vary from film to film or sensor to sensor > > ric > > > > On Dec 7, 2012, at 11:58 AM, "Frank Filippone" <red735i at verizon.net> > wrote: > >> Found a reference ... where the guy said that the Heliopan had less color >> shift than "others". Will try to find the filter... B+H has them. >> >> Thanks Bob..... >> >> Frank Filippone >> Red735i at verizon.net >> >> >> I remember a thread in getdpi.com about this. Look under Medium Format >> (Dante's Inferno) and filter for a thread about ND filters. I person on >> there did a lot of testing. Membership is free and worthwhile. >> Bob >> >> On Thu, Dec 6, 2012 at 10:55 PM, Frank Filippone >> <red735i at verizon.net>wrote: >> >>> I am interested in slowing down things, a lot. I had picked out a 10 >>> stop ND filter, then did a bit more research, where I found this >>> tidbit...( though it is for a 6 stop reduction) >>> >>> >>> >>> "This B+W Neutral Density Filter reduces the light by six f-stops. >>> With this filter and without changing the f-stop, a shutter speed of >>> 1/60 s is changed to a full second, thus requiring the use of a >>> tripod. Flowing water is rendered as flowing in the photo, and people >>> moving in streets are dissolved in unsharpness or become invisible. >>> Because of its higher transmission in the red beyond 660 nm, this >>> filter brings a slightly warm tone to color photographs. If this >>> effect is undesirable, a B+W UV-/IR-Blocking Filter >>> 486 >>> in front of the neutral density filter (not behind it) remedies that >>> situation. The filter factor is 64x." >>> >>> >>> >>> >>> >>> Has anyone ever heard of a ND filter of this strength being a bit warm >>> toned? >>> >>> >>> >>> Frank Filippone >>> >>> Red735i at verizon.net >>> >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > > >