Archived posting to the Leica Users Group, 2003/07/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]What I meant to say was at the same distance the 90 is - a bit - less forgiving. 75f1.4 = 1.4cm, 90f2 = 1.35cm. But half a mm is almost (literally) splitting hairs. Lots of numbers -- but it explains why my shots with the 75 at 1.4 have never worked if the subject was around 50 ft, specifally shoting in cathedrals. Infinity (calculated) is 305 ft and beyond. I'm going to start bracketing (focus) in that situation. For max DOF -- love the heliar. Wide open (okay f4.5) at its hyperfocal distance (5.5ft) near focus starts at about 32". Kev. Eric Welch wrote: > > On Thursday, July 24, 2003, at 09:49 PM, Kevin H wrote: > >> At .75 m you get a whopping 7.5mm in focus. That’s 29.5 inches with >> just over 1/4 inch dof. >> >> The 90 f2 wide is a tiny bit less forgiving, but doesn’t focus as >> close. At one meter you’ve got 13.5 mm (1/2" ) > > > I think you meant to say a tiny big MORE forgiving. > > Eric > Carlsbad, CA > > "Going to war without France is like going > deer hunting without an accordion. All you > do is leave behind a lot of noisy baggage." > --- John and Alma Dunlap > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html > > . > - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html