Archived posting to the Leica Users Group, 2010/10/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Your right its one stop of light for half or twice distance. -------------------- Mark William Rabiner Photography http://gallery.leica-users.org/v/lugalrabs/ mark at rabinergroup.com > From: Philip Forrest <photo.forrest at earthlink.net> > Reply-To: Leica Users Group <lug at leica-users.org> > Date: Tue, 5 Oct 2010 20:40:25 -0400 > To: Leica Users Group <lug at leica-users.org> > Subject: Re: [Leica] Another M9 question > > Its a 1 stop difference, not two. > Phil Forrest > > -----Original message----- > From: Mark Rabiner <mark at rabinergroup.com> > To: Leica Users Group <lug at leica-users.org> > Sent: Tue, 05 Oct 2010, 20:10:42 EDT > Subject: Re: [Leica] Another M9 question > > DOF (depth of field) is a mixed bag when you have things perfectly in focus > but dropping off fast into the darkness with the inverse square law. Or > whitening out before you the same as things get closer. > With each doubling or halving of light you gain or loose two f stops. > That's the inverses square law. As I understand it. Having flunked math. > You can not miss nailing your focus with flash as it allows you to stop > down > a bit or stop in fact way way down in fact: > But there is only one point front to back in which its exposed right. > Not that you even it out like crazy with Photoshop and grad masks. > > Bounce flash off the ceiling is a good way around this. > > > > -------------------- > Mark William Rabiner > Photography > http://gallery.leica-users.org/v/lugalrabs/ > mark at rabinergroup.com > > >> From: Tom Schofield <tomschofield at comcast.net> >> Reply-To: Leica Users Group <lug at leica-users.org> >> Date: Tue, 5 Oct 2010 15:03:19 -0700 >> To: Leica Users Group <lug at leica-users.org> >> Subject: Re: [Leica] Another M9 question >> >> Very true! I bought the sf20 when I bought the M7 and maybe used it > twice! >> Which is to a large part why I don't want to spend $500-800 on a new > flash! >> >> Sometimes when I take shots of my wife's preschool class, I want more DOF > than >> available light allows, and I am thinking of trying macro with it either > with >> a viso or a macro adapter, if I could find one used. (I can get pretty > close >> with the 75mm, too.) >> >> Of course, a cheap canon dslr with an R adapter might be an easier choice > for >> macro. >> >> Tom > > > > _______________________________________________ > 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