What are Zeiss manual lenses? Looks like they're coming for FE mount

Started Apr 7, 2014 | Discussions thread
JamieTux Veteran Member • Posts: 4,069
Re: OK

blue_skies wrote:

then let me simplify this:

Only ZM lens designs were unrestricted by the mirror box, all other designs require 45-50mm clearance between the sensor and the rear lens element.

No, the Contax G lenses were autofocus Zeiss lenses for the Contax G rangefinder which I used to shoot with. In terms of modern lenses the Touits are there too.

The E-mount and X-mount mirrorless mounts are simple a baffle around the ZM mount, if you want to visualize it as such - with added electronics.

In what way? The Touit lenses are 12mm f2.8, 32mm f1.8 and 50mm f2.8 macro. All focus to 30cm or less (and only cover APS-C)... None of those focal length/aperture combinations exist in ZM (infact 2 of those focal lengths don't exist in ZM at all) - and all ZM bar the 15mm have a minimum focus distance of 50cm or more and cover a 35mm sensor.

If you change the mount, electronics, focal length, aperture, minimum focal distance and optical formula then I think you'd have to be clutching at straws or mis-informed to be saying that the they mounts are a simple baffle around an existing lens...

Here's what I mean about the optical formula:
Touit lenses...
12mm f2.8 - Distagon 11 elements in 8 groups
32mm f1.8 - Planar 8 elements in 5 groups
50mm f2.8 - Makro Planar 14 elements in 11 groups

NOT ONE of those optical formulas exist in the enter ZM range.

So I don't know where your infomation is coming from but I disagree with it. Just for references here are my sources....

I agree with a lot of what you write in a lot of the forums Henry, but I disagree on the technical aspect here, sorry.

The older ZM designs gets as close as 12-18mm to the sensor, which is too close for FE sensors.

So, I expect a newer design which will place the rear element between this 18mm and 45mm point.

Any mirror lens design is simply overkill - look at fast WA (D)SLR lenses - they are huge - whereas the ZM (RF) lenses are tiny in comparison.

Because the mirror box lenses have to be retrofocal - and if you're moving the rear element forward then so will these (although that crossover will start later if there is a "midpoint" version - but then what's the relationship to the ZM?

From a Zeiss' perspective, I would consider ZM, E/FE and X/FX mount as potential targets for these lenses. If electronic coupling is not needed or can be limited to e.g. EXIF only, then these lenses have three target groups.

To me the logical ones are still the Contax G lenses unless there was a legal issue and Kyocera own the lens designs now or something?

And yes, ZM represents Zeiss M mount, but this is their mirrorless mount. ZM-derived, mirror-less derived - they are all similar in that they can place the rear element closer, enabling less retrofocal distortion, and smaller lens designs.

It's not Zeiss's mount at all - it's Leica's... Yes - your other points are valid - but M mount is already a deeper mount than E-mount - it doesn't matter whether the mount forces retrofocal or not if the sensor demands it

Even with moving the rear element outward, and perhaps switching lens designs from Biogons to other, I would still consider it ZM-derived.

OK - this is where I'm confused - why would it be more ZM derived than Touit, ZE, ZF, ZA, cine, or any of the other ranges of lenses that Zeiss already produce or have produced in the past?

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 JamieTux's gear list:JamieTux's gear list
Nikon 1 J5 Fujifilm X-E3 Nikon 1 Nikkor 18.5mm f/1.8 Zeiss Touit 50mm F2.8 Nikon 1 Nikkor VR 10-30mm f/3.5-5.6 PD-Zoom +6 more
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