Archived posting to the Leica Users Group, 2013/05/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Mark, I took it from your previous explanations that you finally said, if I understood your point, that you, Mark, need to stop down two clicks in order to benefit from a "sharpness safety buoy" (SSB) around your point/plane of focus as a precautionary measure. At least that's what I understood and it made sense to me too, depending on the kind of shot you're taking. Starting from there what I am saying is simply that this safety cushion (SSB) is definitely not linked with 5.6 - totally irrelevant to my eyes. The safety diaper (SSB) MAY be offered by 2 stops on a given focal length on a certain format alright. The same SSB will be provided with just one stop at another FL. And by NO stop at all using a shorter FL on a smaller format. The "bumper/diaper/cushion/Dof" for f2 at 28mm on the X10 is NOT the same as f2 at the same FL on the Digilux3, and both are way larger than the same f2 using any NikonDx as you are well aware, not to speak of the Fx at the same F2 28mm as your own experience must have also confirmed. I won't go into S2-ALpa-MF-LF metaphysics here, but I bet it would still strengthen my case. So if you need say a set 5" insurance on your focusing, you won't stop down as much on camera combo X and camera combo Y. Remember I started the thread asking why you insisted on a set forever in stone 5.6 that would be independent of the circumstances of the case/shot. You answered, even though indirectly that it's not 5.6, rather it is "stop down two", which I don't find always grounded either with the gears I use. But it has all given me a nice and helpful insight into your WHYs :-) And might change my why nots ;-) Thanks again Philippe ======================================== Message du : 20/05/2013 08:54 De : "Mark Rabiner " <mark at rabinergroup.com> A : "Philippe Amard" <philippe.amard at sfr.fr> Copie ? : Sujet : Re: [Leica] Mark's +2 and be there - thanks I think the f stops are the same when you change formats!!? Or are you kidding? On 5/19/13 5:35 PM, "Philippe Amard" wrote: > > Thanks for the calculator > > > Now, +2 might be +1 on micro 4/3s, and plus zero on 2/3 > > > Amiti?s > Philippe > > > > > ======================================== > > Message du : 19/05/2013 23:08 > De : "Mark Rabiner " > A : "Philippe Amard" > Copie ? : > Sujet : Re: [Leica] Mark's 5.6 and be there - MARK II > > > Yea I got a thing on my computer for that now > http://imaginatorium.org/stuff/stops.htm > > And two stops down from f1 is f2. > Summicron. > > And stopping down to 5.6 is 5 stops. > What I think of as f22 being. > > > On 5/19/13 5:01 PM, "Philippe Amard" > wrote: > >> So you're back at it :-( >> >> >> nocti 0.95 stopped down two = ? >> telyt 560 f5.6 stopped down two = ? >> >> >> Both serious lenses, primes and on topic. >> >> >> Ph >> >> >> >> >> >> >> >> ======================================== >> >> Message du : 19/05/2013 22:44 >> De : "Mark Rabiner " >> A : "Leica Users Group" >> Copie ? : >> Sujet : Re: [Leica] Mark's 5.6 and be there >> >> >> If you've looked at those lens test charts they used to always had in Pop >> and Modern photography monthly for decades we all did a lens always get a >> bit better contrast and resolution stopped down two or three. Its just the >> nature of optics. >> Now we hear that with some of our four grand $ Leica glass "there is no >> reason to stop down it all" I kind of think its horse crap. >> A lens going to improve stopped down a bit. The fact that it says Leica on >> it and cost four grand has no way of changing that. >> You wanna use the meat of the lens. There is fatty residue in the outside >> parameter best cut off by the butcher. >> >> >> On 5/19/13 12:16 PM, "Lew Schwartz" wrote: >> >>> Also, aren't a lot of 35mm lenses supposed to be sharpest at 4.0 - 5.6? >>> >>> -Lew Schwartz >>> >>> >>> On Sun, May 19, 2013 at 5:29 AM, >> wrote: >>> >>>> >>>> Thank you Marshall, >>>> >>>> >>>> this was known to me and actually sounds more of an urban legend >>>> adressing >>>> trainees or freshmen PJs than anything else. >>>> >>>> >>>> In addition it doesn't explain why Mark a contemporary experienced >>>> professional photog who has published in the NYT, insists on shooting >>>> 5.6 >>>> and be there whatever the format. >>>> >>>> >>>> :-( >>>> >>>> >>>> Philippe, still willing to learn :-) >>>> >>>> >>>> >>>> >>>> ======================================== >>>> >>>> Message du : 19/05/2013 06:11 >>>> De : "Marshall Hunt " >>>> A : "Leica Users Group" >>>> Copie ? : >>>> Sujet : Re: [Leica] Mark's 5.6 and be there >>>> >>>> >>>> It is a modification of a motto from the early days of press >>>> photography, >>>> when you needed three hands and big pockets to use a Speed Graphic. >>>> : >>>> "f.6" set your Speed Graphic lens at 5.6 so you have some depth of field >>>> when you estimate the distance. >>>> >>>> "and be there" be at the scene of the action; otherwise you can't get a >>>> fast shot. >>>> >>>> >>>> On Sat, May 18, 2013 at 3:25 AM, >>>> wrote: >>>> >>>>> Mark repeatedly writes: >>>>> >>>>> >>>>> F 5.6 and be there. >>>>> >>>>> >>>>> >>>>> What's YOUR rationale for shooting at 5.6? >>>>> >>>>> >>>>> >>>>> >>>>> If it is about DoF it is completely irrelevant for it also depends on >>>>> sensor size, but this you know. >>>>> >>>>> >>>>> So what is it please? >>>>> >>>>> >>>>> >>>>> >>>>> AMiti?s >>>>> Philippe >>>>> >>>>> >>>>> _______________________________________________ >>>>> 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 >>>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> > > > -- Mark William Rabiner Photography http://gallery.leica-users.org/v/lugalrabs/