Archived posting to the Leica Users Group, 2015/09/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Ken, Thanks. I reviewed the list. Jim Nichols Tullahoma, TN USA On 9/10/2015 5:47 PM, Ken Carney wrote: > Jim, > > If a lens is vulnerable to a hot spot, it gets worse as the lens is > stopped down. Kolari > (http://kolarivision.com/articles/lens-hotspot-list/) says that your > Fuji 27mm is only useable at 2.8, which is probably OK anyway since > you'll need all the light you can get. Based on my experience with > other Fuji lenses, I'm confident that auto focus will be fine. With > your Leica lens, you can just magnify and focus through the EVF. > > Ken > > On 9/10/2015 4:20 PM, Jim Nichols wrote: >> In my mind, the "hot spots" have no direct connection to focusing, >> unless, in their effort to get the total image focused in one plane, >> they have created the hot spot much as one does with a simple >> magnifying glass. It could be an unexpected result of their pursuit >> of perfection. But, I could be totally off-base here. >> >> Jim Nichols >> Tullahoma, TN USA >> >> On 9/10/2015 4:04 PM, George Lottermoser wrote: >>> On Sep 10, 2015, at 3:53 PM, Jim Nichols wrote: >>> >>>> What I have read this afternoon indicates that the latest Leica >>>> lenses are focus-corrected to such high wavelengths that, for all >>>> intents and purposes, no further correction is required. Having no >>>> intention of making such an investment any time soon, I did not >>>> spend a lot of time following this back to its source. >>>> >>>> Another slant on this was that Leica removed the IR index because >>>> it confused their customers, and that it is really only valid at >>>> infinity, anyway. And, with zoom lenses, there are multiple >>>> correction settings depending on where the lens is in the zoom range. >>>> >>>> Most folks seem to feel that some experimenting is necessary to >>>> find the most useful setting for the type of photography intended >>>> to be carried out. >>> Interesting. >>> >>> Though my experience with the 093 IR filter from B+W >>> contradicts the claim; >>> at least for the 28 Summicron, 50 Summilux Asp, and 35 Summilux Asph. >>> Perhaps these are no longer considered the "latest Leica lenses." >>> Even if they did focus correctly; >>> they still all produce the significant hot spots; >>> and ever more prominently as you stop down. >>> >>> And yes the proof is, as always, in the YMMV pudding. >>> >>> Regards, >>> George Lottermoser >>> >>> http://www.imagist.com >>> http://www.imagist.com/blog >>> http://www.linkedin.com/in/imagist >>> >>> >>> _______________________________________________ >>> 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 >