Archived posting to the Leica Users Group, 2019/10/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Many reflex cine lenses can be focused past infinity, which sounds impossible. It is meant to be able to get infinity in focus, as you go all the way out, and bring the far thing that you think is at infinity into sharp focus. If you absent-mindedly just set the lens where the ring stops. you will likely have an out of focus image. Regards, Sonny http://sonc.com/look/ Natchitoches, Louisiana 1714 Oldest Permanent Settlement in the Louisiana Purchase USA On Sun, Oct 27, 2019 at 4:29 PM Mark Rabiner <mark at rabinergroup.com> wrote: > Cirrus clouds are tricky because just like fence posts you can think you > have one lined in focus but it?s the one next to it. > Stratus clouds you may as well go home or go in to Guess Toe Matic > focusing. Which is how I focused on my Voigtl?nder Vito anyway. > Cumulus are what you are going for. They are well defined no two exactly > alike and are easy to focus on with any kind of rangefinder systems. > Stratocumulus again not good too smooth. > Altocumulus are past infinity so you have to compensate and bring two > lunches. They are "far far away" an optical term. > > > > > -- > > Mark William Rabiner > Photographer > > ?On 10/27/19, 5:05 PM, "LUG on behalf of Mark Rabiner" <lug-bounces+mark= > rabinergroup.com at leica-users.org on behalf of mark at rabinergroup.com> > wrote: > > I've always had a fascination with the infinity symbol ? on my first > camera I got in 1965 with f stops and shutter speeds when I was 12 or 13 it > was a mid 1950's Voigtl?nder Vito BL. I was not sure what to focus it at > infinity on it seemed like it should be a long way away maybe I should pack > a lunch. No hills in the north shore Chicago suburbs to speak of. > There was no internet to look it up there was no one to ask and the > Dewey Decimal System was not doing me any good in the Winnetka and Glencoe > library's. > So I settled on clouds. I decided clouds were infinity. I aimed at > clouds when I adjusted the eyepiece on my camera for years. Decades. > Erwin may have noticed some of my occasional infinity posts on the LUG > and did a thing on what ? (infinity) means in photography on a real level > like how far way is it really. > Turns out its not all that far away you don?t even need to bring your > lunch! > The focal length of your camera times the square root of the > hypotenuse that kind of thing... couple of hundred feet away - piece of > cake. > You need to know how to to math though or how to use a slide rule. Or > Geometry. Or trigonometry. No biggie, just way out of my pay grade. > Clouds may be bit fluffy though for accurate focusing but they've all > I've got; on a cloudy day. > > Here's one right next to a Leica M2! > > https://www.35mmc.com/05/04/2019/compact-excellence-a-review-of-the-voigtlander-vito-bl-by-andrew-morang/ > > > > > > -- > > Mark William Rabiner > Photographer > > ?On 10/23/19, 11:15 PM, "LUG on behalf of Paul Roark via LUG" > <lug-bounces+mark=rabinergroup.com at leica-users.org on behalf of > lug at leica-users.org> wrote: > > Don Dory via LUG <lug at leica-users.org> wrote: > > > I will just add that Leica tests every lens and keeps the record > for every > > lens produced. The MTF is from real lenses and not some > idealized > > computer projection. > > ... > > > Which is unlike most of the companies. In my pre-Leica days, I > became > frustrated returning lenses that focused at different places for > the > different edges of the field. I have a mountain ridge at > "infinity" and > clear air where I live. The poor assembly of the middle market > optics was > very obvious and frustrating. We do get something for those > prices we pay. > > Paul > www.PaulRoark.com > > > > > > _______________________________________________ > 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