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Author Topic: Zeiss 55 lenses compared  (Read 3325 times)

BernardLanguillier

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Re: Zeiss 55 lenses compared
« Reply #1 on: January 29, 2014, 05:16:55 pm »

Impressive performance.

Cheers,
Bernard

ErikKaffehr

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Re: Zeiss 55 lenses compared
« Reply #2 on: January 30, 2014, 04:53:58 pm »

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MatthewCromer

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Re: Zeiss 55 lenses compared
« Reply #3 on: January 30, 2014, 05:07:28 pm »

Well AFAIK both lenses are Zeiss designs.

I expect the differences in design also owe something to the SLR mirror box clearance required for the Otus.
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Telecaster

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Re: Zeiss 55 lenses compared
« Reply #4 on: January 30, 2014, 09:34:51 pm »

It is interesting to see that Sony uses a "Sonnar" type design for the 55/1.8 while Zeiss uses "Distagon" design for the 55/1.4.

Attached is the design diagram for the 55/1.8.

Edit: also attached now for comparison purposes is the design diagram of the original Zeiss Jena 50/1.5 Sonnar.

-Dave-
« Last Edit: January 31, 2014, 04:13:04 pm by Telecaster »
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ErikKaffehr

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Re: Zeiss 55 lenses compared
« Reply #5 on: January 31, 2014, 12:29:23 am »

Yes, the absence of the mirror box gives more degrees of freedom. But most "normal" lenses re double gauss designs, even on SLRs.

My guess is that Zeiss choose the Distagon type design over double gauss to be able to reduce vignetting and keep beam angle down. Sony on the other hand choose f/1.8 much reducing the problem with beam angle and vignetting, they also have offset microlenses on the sensor which help with beam angle, so they could choose a less expensive design that is easier to make.

Best regards
Erik

Well AFAIK both lenses are Zeiss designs.

I expect the differences in design also owe something to the SLR mirror box clearance required for the Otus.
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geesbert

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Re: Zeiss 55 lenses compared
« Reply #6 on: February 03, 2014, 12:18:25 pm »

or maybe the otus has a larger image circle to cater for these new large cmos sensors?
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BernardLanguillier

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Re: Zeiss 55 lenses compared
« Reply #7 on: February 03, 2014, 12:26:13 pm »

or maybe the otus has a larger image circle to cater for these new large cmos sensors?

Funny, that thought crossed my mind also.

Cheers,
Bernard

kers

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Re: Zeiss 55 lenses compared
« Reply #8 on: February 03, 2014, 03:52:35 pm »

Would love to see what Otus does on an Alpa with a medium back - especially at d8...
« Last Edit: February 03, 2014, 07:09:23 pm by kers »
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LKaven

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Re: Zeiss 55 lenses compared
« Reply #9 on: February 03, 2014, 06:04:07 pm »

I also wondered about whether the Otus had an extended image circle.  Shouldn't be too hard to check...for anyone who actually has one.  I think either way (as kers suggests) it would make some interesting images on an IQ250 back.  Even some vignetting would look kinda good.

ErikKaffehr

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Re: Zeiss 55 lenses compared
« Reply #10 on: February 04, 2014, 04:24:06 pm »

Hi,

That may work, maybe. A lot of 135 lenses seem to be usable on a Hartblei HCam with MF backs. But I don't think Zeiss is into medium format.

It has been suggested that Sony may use the same sensor for motion, IMAX style video. In that case it may make more sense, as 4K is around the door and 8K can be seen at the end of corridor.

Best regards
Erik



I also wondered about whether the Otus had an extended image circle.  Shouldn't be too hard to check...for anyone who actually has one.  I think either way (as kers suggests) it would make some interesting images on an IQ250 back.  Even some vignetting would look kinda good.
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Erik Kaffehr
 
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