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09-12-2016, 08:02 AM   #1
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New Samyang 85mm F1.2 and 14mm F2.4

But not for Pentax (Yet....)

http://www.digitalrev.com/article/samyang-go-premium-with-new-85mm-f1-2-and-14mm-f2-4-lenses



09-12-2016, 08:10 AM   #2
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Not even in Nikon F or Sony E mount as far as the 85mm f/1.2 is concerned: these mounts are too narrow to accommodate a 85mm f/1.2's rear element together with the mount's electric contacts.

Look at the rear of a Canon EF 85mm f/1.2L II USM:

09-12-2016, 08:39 AM   #3
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The Mitakon Speedmaster 85mm F1.2 is available in K (and F and E en EF) and the back element is not that wide...


Last edited by D1N0; 09-12-2016 at 08:50 AM.
09-12-2016, 09:02 AM   #4
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Nothing to do with K-mount, so should be in the section for "other brands".

09-12-2016, 09:04 AM   #5
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Sofar Samyang has always brought out a K-mount version, if sometimes later. Mr pessimist.
09-12-2016, 09:12 AM   #6
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It's not even for Nikon, the 85. So save your judgement for real products coming for K-mount.
09-12-2016, 09:16 AM   #7
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These are lenses for mirrorless systems. Clicked the wrong button


Steve

Last edited by stevebrot; 09-12-2016 at 09:25 AM.
09-12-2016, 09:17 AM   #8
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QuoteOriginally posted by D1N0 Quote
The Mitakon Speedmaster 85mm F1.2 is available in K (and F and E en EF) and the back element is not that wide...
The Mitakon Speedmaster 85mm f/1.2 has no electrical contact which could interfere with the optical path and the picture you posted is that of the 14mm f/2.4 -see the petal-shaped hood.

To find a picture of the rear of the Samyang Premium 85mm f/1.2 you have to go to the page of the 14mm f/2.4 .



09-12-2016, 09:20 AM   #9
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QuoteOriginally posted by stevebrot Quote
These are lenses for mirrorless systems.
Nope:
Samyang Optics, Lenses for Camera ? Cine ? CCTV ? Photo, Prime Lenses & Third party Lenses
Canon EF. It is aimed at the 5Ds with it's 50mp resolving power.

The other one is coming in EF F and E (probably just a bit longer). Samyang Optics, Lenses for Camera ? Cine ? CCTV ? Photo, Prime Lenses & Third party Lenses

---------- Post added 12-09-16 at 18:24 ----------

QuoteOriginally posted by Mistral75 Quote
The Mitakon Speedmaster 85mm f/1.2 has no electrical contact which could interfere with the optical path and the picture you posted is that of the 14mm f/2.4 -see the petal-shaped hood.

To find a picture of the rear of the Samyang Premium 85mm f/1.2 you have to go to the page of the 14mm f/2.4 .
Still enough room. For Pentax anyway with the contacts on the flange.

Last edited by D1N0; 09-12-2016 at 09:25 AM.
09-12-2016, 09:27 AM   #10
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QuoteOriginally posted by D1N0 Quote
(...)

Still enough room. For Pentax anyway with the contacts on the flange.
Except that the K mount is one centimetre narrower than the Canon EF mount (44mm instead of 54mm)...
09-12-2016, 09:37 AM   #11
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QuoteOriginally posted by Mistral75 Quote
Except that the K mount is one centimetre narrower than the Canon EF mount (44mm instead of 54mm)...
And the back element is roughly 41.5mm measured in photoshop.
09-12-2016, 09:45 AM   #12
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QuoteOriginally posted by D1N0 Quote
And the back element is roughly 41.5mm measured in photoshop.
I don't know much about Photoshop measurements but I do know that there are definitely not 5mm of available space between the rear element and the contacts in the picture above. With a Pentax K mount the contacts would be in the optical path, even more than those of a Canon EF 85mm f/1.2L, and they might even interfere with the rear element since the register of the K mount is 1.46mm longer than the one of the Canon EF mount (all things being equal, the rear element would be 1.46mm closer to the flange).
09-12-2016, 09:51 AM   #13
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QuoteOriginally posted by Mistral75 Quote
With a Pentax K mount the contacts would be in the optical path
they are outside the throat. you are not making sense.
09-12-2016, 09:58 AM   #14
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QuoteOriginally posted by D1N0 Quote
they are outside the throat. you are not making sense.
Indeed. I stand corrected.

Then the reason for no K-mount version at launch is the same for the two lenses: the design of these Samyang Premium lenses natively includes an electro-magnetic command of the aperture instead of a mechanical command of some sort.

This gives more freedom to design the lens but you need a lens mount that supports this sort of thing. Pentax K-AF4 does but it's only 4 months old and supported by too few a camera for Samyang to be interested in the corresponding market.
09-12-2016, 10:08 AM   #15
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yeah but you made that up. There is no reason why they couldn't make it work on Pentax or even Nikon.
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