Archived posting to the Leica Users Group, 2010/04/15
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Richard, You are correct. I just read Erwin Puts' article on R lens design, and he states that, because of the mirror box dimension, most are of retrofocus design. Jim Nichols Tullahoma, TN USA ----- Original Message ----- From: "Richard Taylor" <r.s.taylor at comcast.net> To: "Leica Users Group" <lug at leica-users.org> Sent: Thursday, April 15, 2010 10:08 AM Subject: Re: [Leica] M Lenses on GF-1 > There should be. SLR lenses need to be further away from the sensor than > M lenses in order to clear the mirror, are usually retrofocal, and should > have better image quality on 4/3rds sensors. > > I was tempted to buy an 20mm R lens to try on the G-1 but after the > introduction of the 20mm Lumix pancake I put that off because the Lumix > was such a good performer and far smaller than the R lens. > > I think there were some postings on R lenses on micro 4/3rds cameras but > can't remember when. I search of the archives might turn them up. > > Regards, > > Dick > > > > On Apr 15, 2010, at 10:48 AM, Jim Nichols wrote: > >> Hi Richard, >> >> I use Leica-R lenses on my Olympus E-1. Is there a lot of difference >> between the Summicron-R and the Summicron-M design? >> >> Jim Nichols >> Tullahoma, TN USA >> ----- Original Message ----- From: "Richard Taylor" >> <r.s.taylor at comcast.net> >> To: "Leica Users Group" <lug at leica-users.org> >> Sent: Thursday, April 15, 2010 9:42 AM >> Subject: Re: [Leica] M Lenses on GF-1 >> >> >>> The best way to think about this is to think of each pixel as a tiny >>> bucket with steep sides and the light sensitive area at the bottom. >>> Light must go straight in in order to be detected. Light arriving at >>> anything other than almost straight in is either lost or scattered. >>> >>> That's why the sensors in the M8 and M9 have the offset lenses on top of >>> the sensor. >>> They allow the sensor to respond better to the off-axis light coming out >>> of M-type lenses. >>> >>> SLR lenses are usually retrofocus designs that send the light close to >>> straight in to the sensors and therefore work better on the micro 4-3rds >>> cameras than M lenses do. >>> >>> Dick >>> >>> (Who works with sensors like these in the infrared for space missions.) >>> >>> >>> >>> On Apr 15, 2010, at 9:17 AM, Simon Ogilvie wrote: >>> >>>>> I'm also perplexed at how Contax G lenses can be materially better on >>>>> Micro Four Thirds than are Leica M lenses, or even CV lenses for that >>>>> matter. While I haven't used all on Micro Four Thirds I have used them >>>>> all on film and for the most part they're all pretty good. Thus I'm >>>>> curious as to why the performance would be so different on Micro Four >>>>> Thirds. What kind of adapters are you using? >>>> >>>> I agree - one of the primary reasons I bought into the 4/3 system was >>>> because it allowed me to use my Leica M (and Voigtlander) lenses which >>>> don't see much use any more as I shoot very little film these days. >>>> The results using these lenses were very disappointing. The Panasonic >>>> 14-45 covers the range of nearly all of my M lenses anyway, so as the >>>> results seem better and it's much more convenient to use, I stick with >>>> the zoom. I was surprised that the results from the Contax G lenses >>>> looked so much nicer. Why this is the case when the Leica lenses are >>>> so nice with film I cannot explain. The adapters are the Voigtlander >>>> one for the Leica-M lenses, and an adapter imported from Hong Kong for >>>> the Contax G with a little manual focus wheel that engages with the >>>> focussing drive on the lenses. >>>> >>>> >>> >>> >>> _______________________________________________ >>> 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 > >