Use Contax G lenses on Leica

[splitimageview]

I'm not sure why they don't have click stops, that would be a good question to ask. As far as the price, for a custom design, produced onesy twosey, it's really quite good, all things considered. If these were built on a production line in volume, it would be cheaper of course.

EDIT: I presume the 90 has click stops as it looks like the conversion uses the original barrel and aperture ring.

 

[raid]

I may try get a loaner lens to try out.
In fact, I hope to get a matching ZM lens from someone else to have a comparison of some sort between the lenses.
My wish is to get as a loaner the 28-45-90 set as LTM modified, and then get the corresonding ZM lenses as loaners.

Maybe someone reads this comment here and things happen?

 

[splitimageview]

Raid, I presume Sean Reid has reviewed most (if not all) the ZM lenses. Perhaps he could do reviews of the G conversions, too.

 

[jmkelly]

OK somebody help me out here. Ernostar vs. Sonnar - what's the difference? Duh - when it comes to the 50mm f1.5 lenses, but when considering the 90mm lenses there seems to be some cross-talk. It's a Sonnar design if it is a Zeiss lens, but an "Ernostar" if the Zeiss patent might be infringed?

 

[ferider]

The Ernostar is an older design John, a predecessor of the Sonnar. The confusion is partially rooted in Zeiss calling newer Ernostar based lenses "Sonnar", like the Contax G 90/2.8, Rollei 40/2.8 and Hasselblad lenses.

Much the same signature, though. Your Zuiko 85/2 is an Ernostar, too, I believe.

Frank (Taunusreiter) has a good description on his web-site:

http://www.taunusreiter.de/Cameras/Biotar.html

Quoting from him:

Es ist schwierig zu definieren was den "Sonnar-Typ" ausmacht weil der Eigentümer des Begriffs Sonnar, die Firma Zeiss, ihn wie anderere auch recht weitgehend verwendet und auch Objektive damit bezeichnet die eigentlich Ernostare sind, und sogar waschechte Gauss-Typen wie das neue 2.0/85 zur Zeiss-Ikon.. Unter Sonnar-Typ versteht man i.A ein vom Triplet abgeleitetes, lichtstarkes Objektiv mit einer geringen Zahl optischer Gruppen (klassischerweise drei) und wenigstens einem dreifach verkitteten Glied.

Translated by me: It is difficult to describe what defines the "Sonnar-type", since the owner of the term Sonnar, Zeiss, as others, uses it quite widely to also denote lenses which really are Ernostars, and even true Gauss types like the new 2.0/85 for the Zeiss Ikon. Usually a Sonnar is a fast lens, derived from a triplet, with few optical groups (classically three) and at least one element consisting of 3 cemented elements.

Roland.

PS: attached more details on your new Hex, John. Congrats !

 

[raid]

Raid, I presume Sean Reid has reviewed most (if not all) the ZM lenses. Perhaps he could do reviews of the G conversions, too.

Well, I have compared about fifty lenses so far, and I could use on the same camera other classic lenses for a user's opinions of the lenses. I would like to add to my earlier results these "new" lenses.

 

[splitimageview]

Raid, have you talked to Dirk? He had mentioned that he was going to offer a demo of a 45/2.

 

[photogdave]

I'm not sure why they don't have click stops, that would be a good question to ask.

It would certainly be a benefit on any Micro 4/3 body that comes out with HD video capture. One could record video clips and change the aperture without hearing the sound of the clicks in the audio.
I believe some users of the 5D II are having F-mount lenses modified to remove the clicks.

 

[Hacker]

I have a 45mm lens converted by Mr. Miyazaki that I enjoy using on my M8. Ben Marks

Yes, Miyazaki san of MS Optical. http://www.camerapedia.org/wiki/MS_Optical_R&D