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4 hours ago, Viv said:

No. Not really necessary.

It is for the wider lenses, say 21mm, but it's easy to do, there is a rebate machined into the lens flange designed to take paint for the coding, and you only need the black marks.

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I have seven ZM lenses, from 25mm to 85mm. Depending on the focal length they range in quality from very good to superb. The only ZM I didn’t like was the Biogon 35/2 because the corners never got completely sharp with the copy I had. I replaced it with a C Biogon 35/2.8 and a Distagon 35/1.4, which I what I should have purchased in the first place.

If the C Sonnar 50/1.5 is on your shortlist, you should be aware that this (wonderful) lens exhibits severe focus shift. To confuse things further, some lenses are optimised for f/1.5 and others for f/2.8. The review I link to below states that Zeiss now optimises the lens for f/2. In other words, the focus shift issue is a hot mess of conflicting opinions and the only way to know for certain about any individual copy is to test it. My own copy is optimised for f/2.8, which suits me well.

I’d also be wary of having the 50/1.5 ZM as your only 50mm lens, unless you are totally enamoured with its unique rendering. 50mm is my favourite focal length and I have way too many 50mm lenses. But if I could only have one, I’d choose the Summilux-M 50/1.4 ASPH (beautiful rendering wide open, nicely sharp stopped down, floating element design that improves close range performance and eliminates focus shift). Otherwise, if I liked the look of the 50/1.5 ZM I’d pair it with the Planar 50/2 ZM, two complementary lenses for a fraction of the price of the Lux 50 ASPH.

Here’s a link to a comprehensive review of the C Sonnar 50/1.5 ZM:

https://www.35mmc.com/22/11/2015/zeiss-zm-f1-5-50mm-c-sonnar/

He’s using the lens on Leica film bodies, however, so I’d take his opinion that focus shift doesn’t matter in normal usage with a grain of salt.

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I have seven ZM lenses, from 25mm to 85mm. Depending on the focal length they range in quality from very good to superb. The only ZM I didn’t like was the Biogon 35/2 because the corners never got completely sharp with the copy I had. I replaced it with a C Biogon 35/2.8 and a Distagon 35/1.4, which I what I should have purchased in the first place.

If the C Sonnar 50/1.5 is on your shortlist, you should be aware that this (wonderful) lens exhibits severe focus shift. To confuse things further, some lenses are optimised for f/1.5 and others for f/2.8. The review I link to below states that Zeiss now optimises the lens for f/2. In other words, the focus shift issue is a hot mess of conflicting opinions and the only way to know for certain about any individual copy is to test it. My own copy is optimised for f/2.8, which suits me well.

I’d also be wary of having the 50/1.5 ZM as your only 50mm lens, unless you are totally enamoured with its unique rendering. 50mm is my favourite focal length and I have way too many 50mm lenses. But if I could only have one, I’d choose the Summilux-M 50/1.4 ASPH (beautiful rendering wide open, nicely sharp stopped down, floating element design that improves close range performance and eliminates focus shift). Otherwise, if I liked the look of the 50/1.5 ZM I’d pair it with the Planar 50/2 ZM, two complementary lenses for a fraction of the price of the Lux 50 ASPH.

Alternatively, you could get two lenses for one (slightly romantic rendering wide open, sharp stopped down) with the CV Nokton 50/1.2.

Here’s a link to a comprehensive review of the C Sonnar 50/1.5 ZM:

https://www.35mmc.com/22/11/2015/zeiss-zm-f1-5-50mm-c-sonnar/

He’s using the lens on Leica film bodies, however, so I’d take his opinion that focus shift doesn’t matter in normal usage with a grain of salt.

Edited by genji
Added suggestion about CV 50/1.2
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Lloyd Chamber (diglloyd.com) has one of the more exhaustive analyses of ZM lenses on Leica M. Worth the subscription to get a sense of what works best on M bodies. IIRC, the 50 Planar was solid if unremarkable. 

 

In re: 50 Sonnar, Zeiss optimizes the focus for f/2.8 (they did the same for the 35 f/2 Biogon) so it isn’t the sharpest tool in the chest wide-open because of focus shift. Zeiss will adjust the Sonnar to optimize for f/1.5 if that’s where you’d shoot it most. 

Edited by james.liam
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31 minutes ago, james.liam said:

Lloyd Chamber (diglloyd.com) has one of the more exhaustive analyses of ZM lenses on Leica M. Worth the subscription to get a sense of what works best on M bodies. IIRC, the 50 Planar was solid if unremarkable. 

 

In re: 50 Sonnar, Zeiss optimizes the focus for f/2.8 (they did the same for the 35 f/2 Biogon) so it isn’t the sharpest tool in the chest wide-open because of focus shift. Zeiss will adjust the Sonnar to optimize for f/1.5 if that’s where you’d shoot it most. 

If you are looking for in depth objective reviews and comparison testing have a look at Sean Reid. Also subscription I am afraid.

https://www.reidreviews.com/articleindextable.html

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3 hours ago, james.liam said:

Reid does selective reviews, excellent that they are. Lloyd has systematically done so for every ZM lens ever made.

Sean Reid approaches the task of reviewing as an artist, Lloyd Chambers as a technician.

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18 hours ago, james.liam said:

There’s a place for both when choosing your instrument of choice. 

True, and, there can be a place for multiple instruments, with some photographers. 😀 I have accumulated three Fifties, a Summilux-M ASPH, a pre-APO/pre-ASPH Summicron, and an Elmar-M, in less than two years. 

To cite a non-M example, in the Canon EOS EF system, I “upgraded” to the EF 35mm f/2 IS, and EF 35mm f/1.4L II, after acquiring my 50MP 5Ds R. Not only do both of these lenses have their place, but, I find myself wishing I had kept my first-generation EF 35mm f/1.4L, for the sake of art.

Now, I know; never sell or trade a known-good lens, in order to finance the acquisition of its potential replacement. The imperfections of the first-generation 35/1.4L, that caused it to be omitted from Canon’s list of recommended lenses for the 5Ds/5Ds R, were what made the lens’ character. I especially loved the first-generation 35/1.4L on APS-C cameras, which I still have.

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