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Zeiss promises a ZM "surprise" for Photokina

rosuna

By rosuna
in Leica M Lenses

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jaapv

jaapv

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I'm not saying it can't happen but, how many people would seriously consider anything longer than 90mm on a M rangefinder?

 

You must have missed out reading on this forum. There are dozens of threads singing the praises of 135 mm lenses. I actually own and use four different ones, and only two nineties...

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sdai

sdai

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You must have missed out reading on this forum. There are dozens of threads singing the praises of 135 mm lenses. I actually own and use four different ones, and only two nineties...

 

I do miss a lot of stuff on the forum especially when I was on a different course last year. :)

 

But more frequently, the forum serves as an amplifier of extreme love or hate towards something which doesn't necessarily reflect real world situation. Put it this way - the sampling rate is too low. I love the 135mm focal length a lot personally though I must admit that I use it primarily with the SLR systems.

 

Putting personal preferences aside, it's not difficult to debunk the 100/2 ZM rumor as I've posted previously ... focusing a 100mm at f/2 on the 0.68x M9 probably isn't even technically possible or at least, extremely difficult - I need to find the formula - LCT should have it and I got it from one of his ancient post. :)

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adan

adan

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I'm not sure why anyone is linking the 100 Makro f/2 or 55 f/1.4 to the ZM line (for Leica rangefinders).

 

Zeiss makes "Z" lenses in multiple lines for SLRs - ZE (Canon EOS), ZF/ZF.2 (Nikon F), ZA (Sony Alpha)

 

Thus far, all the Zeiss lenses imaged or linked to have been SLR lenses. Nuttin' to do with Leica M.

 

It's quite possible Zeiss will have a new ZM lens as well - but do depress clutch and engage eyes and brain before posting..... ;)

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jaapv

jaapv

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If you can easily focus a 75/1.4, 90/2.0 and 135/3.4 it is hard to see why a 100/2.0 should be impossible. It would depend on the focus throw of the lens.

 

The Apo-Telyt is a nice example. Leica kept insisting it was impossible to focus. Only after literally hundreds of users "proved" that it was quite possible to get wide-open shots reliably they caved in and started to provide a code for the lens.

 

I know about this formula and it is rubbish for making predictions about focussability. It does not take the mechanical construction of the lens into account, nor the ability of the user.

 

 

I do miss a lot of stuff on the forum especially when I was on a different course last year. :)

 

But more frequently, the forum serves as an amplifier of extreme love or hate towards something which doesn't necessarily reflect real world situation. Put it this way - the sampling rate is too low. I love the 135mm focal length a lot personally though I must admit that I use it primarily with the SLR systems.

 

Putting personal preferences aside, it's not difficult to debunk the 100/2 ZM rumor as I've posted previously ... focusing a 100mm at f/2 on the 0.68x M9 probably isn't even technically possible or at least, extremely difficult - I need to find the formula - LCT should have it and I got it from one of his ancient post. :)

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Erik Gunst Lund

Erik Gunst Lund

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24x36 or "double frame" My Spanish breaks down when they start using English words, but could this be an medium format lens?

 

Film cameras for 135mm film, only used half of the frame 18x24 so 24x36 was called double frame.

 

There will be a 'walk through' model of a Zeiss 100/2 lens at the show but it's a ZE not ZM

 

The new ZF 55 1.4 clearly looks like a big DSLR AF lens :) 82mm threads.

 

There is a ZM reference, but not yet any information on what focal length or aperture the ZM will be...

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rosuna

rosuna

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I'm not sure why anyone is linking the 100 Makro f/2 or 55 f/1.4 to the ZM line (for Leica rangefinders).

 

Zeiss makes "Z" lenses in multiple lines for SLRs - ZE (Canon EOS), ZF/ZF.2 (Nikon F), ZA (Sony Alpha)

 

Thus far, all the Zeiss lenses imaged or linked to have been SLR lenses. Nuttin' to do with Leica M.

 

It's quite possible Zeiss will have a new ZM lens as well - but do depress clutch and engage eyes and brain before posting..... ;)

 

Andy:

 

Zeiss has presented a new 55mm f/1.4 lens for reflex cameras. In the press note of that presentation Zeiss refers to new products to be presented at Photokina: AF lenses for CSC cameras and a "surprise" for M mount. So, we I linked the original article it was impossible to separate the different components of these news. The 55mm has nothing to do with Leica, that is true.

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Peter H

Peter H

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I'm not sure why anyone is linking the 100 Makro f/2 or 55 f/1.4 to the ZM line (for Leica rangefinders).

 

................

 

It's quite possible Zeiss will have a new ZM lens as well - but do depress clutch and engage eyes and brain before posting..... ;)

 

 

Unusually rude for you Andy.

 

No one has linked the 55 to the M line because its a Nikon F mount lens.

 

But Zeiss themselves have said there's going to be a surprise for Leica M users, at least one new fast ZM lens will go on sale in 2013, which has been duly reported here for interest's sake, and has quite naturally led to a little speculation as to what the lens might be..

 

Reasonable enough, no?

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wattsy

wattsy

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If you can easily focus a 75/1.4, 90/2.0 and 135/3.4 it is hard to see why a 100/2.0 should be impossible. It would depend on the focus throw of the lens.

 

It's much less to do with the length of the focus throw (although that clearly helps when making very fine adjustments) and much more to do with the effective base length of the RF and the resolving power of the eye. There is a good article about this in LFI (Nov 2004) which discusses the factors involved and has a graph illustrating the minimum RF magnification for a whole range of focal lengths. According to the article a 100mm at F2 is almost on the limit for theoretical accuracy using a 0.72x RF and somewhat beyond the capability of a 0.58x RF (a 90mm at F2 is just okay with the 0.58x RF). The graph suggests a 100mm at F2 might just be okay with a 0.68x RF but the graph is based on acceptable focussing accuracy (and associated CoC) for film usage so I think it is fair to assume that a 100mm at F2 is in fact beyond the focussing accuracy of the M9 RF.

 

By the way, the article is written by Peter Karbe who I think knows what he is talking about.

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lct

lct

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According to the formula b = e*f2/k*z where b is the critical RF base length, e the visual acuity (0.0003 at approx. 1 arcmin), f the focal length, k the aperture and z the circle of confusion (0.030mm), the M9's RF should have an effective base length (EBL) of 50mm, instead of its actual 47mm, to focus accurately a 100/2 lens at full aperture. But it can get a longer EBL with a 1.25x (58mm) or 1.40x (65mm) magnifier on.

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sdai

sdai

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According to the formula b = e*f2/k*z where b is the critical RF base length, e the visual acuity (0.0003 at approx. 1 arcmin), f the focal length, k the aperture and z the circle of confusion (0.030mm), the M9's RF should have an effective base length (EBL) of 50mm, instead of its actual 47mm, to focus accurately a 100/2 lens at full aperture. But it can get a longer EBL with a 1.25x (58mm) or 1.40x (65mm) magnifier on.

 

Thanks for chiming in, LCT. :)

 

I need to save multiple copies of your formula by the way - knowledge is power and memory is the key to turn it on. ;)

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Peter H

Peter H

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Big lenses like these would block the VF a lot i'm afraid but perhaps a ZM version would be smaller... Would you have a link to the Zeiss announcement BTW? Just curious.

 

Welcome to Carl Zeiss Ltd.

 

For some reason the link takes you to their home page but if you go to Press Releases, then the Photokina Preview link, you can read the entire article which states that a new fast ZM lens is coming.

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sdai

sdai

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The original Zeiss press release says the following regarding ZM lenses:

 

For fans of the Carl Zeiss family of ZM systems for rangefinder cameras, Carl Zeiss has a special surprise in store. In 2013, at least one fast lens with M bayonet will go on sale. Using lenses from the ZM series with adapters is also very popular on mirrorless system cameras.

 

My read is they'll probably offer a good discount on what are already on the store shelves and then, by some time next year, they will build a fast lens (f/1.4 perhaps?) with the M bayonet.

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