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Author Topic: Alpha 7(R) and M lenses  (Read 6274 times)
dwood
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« Reply #20 on: October 16, 2013, 07:21:24 PM »
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P. S. Sigma has announced just the sort of lens I was thinking of:
http://www.sigmaphoto.com/product/24-105mm-f4-dg-os-hsm-art
But no Sony mount AFAIK.
I believe that this Sigma will be available in A-mount.

In other news, Samyang has apparently announced the following primes for for the FF-E mount...couple months out, or so it's being reported:

Samyang 14mm f/2.8 ED AS IF UMC
Samyang 24mm f/1.4 ED AS IF UMC
Samyang T-S 24mm f/3.5 ED AS UMC
Samyang 35mm f/1.4 AS UMC
Samyang 85mm f/1.4 AS IF UMC
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ErikKaffehr
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« Reply #21 on: October 21, 2013, 10:42:55 PM »
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Hi,

Things get much worse on a larger sensor.

One thing that may be forgotten that a sensor is not a flat piece like film but an optical package. It normally consists of:

- IR filter
- A dual layer of lithium niobate that act as beam splitters for OLP filtering

In case the Lithium Niobate is removed it would be replaced by optical glass with corresponding thickness, so I don't think the 7r will gain advantage in this respect.

That optical package needs to be include in the lens calculations. Biogon type of lenses are badly affected buy having an optical package behind the lens.
(check out page 12 of this excellent document: http://blogs.zeiss.com/photo/en/wp-content/uploads/2011/12/en_CLB41_Nasse_LensNames_Distagon.pdf )

The differences between NEX-6 and NEX-7 may depend on different well design/micro lens combinations.

The Leica M has a lot of issues, too, but some of these are handled in software based on lens coding and estimated aperture (Leica calculates aperture from ratio of surround light and exposure). Leica doesn't use OLP filter and tries to use a thin IR filter.

Best regards
Erik

Hi Michael,

Any comments on the 35 Lux FLE or 24 Elmar specifically?  Is the 35 Lux totally clean and sharp? The 24 Elmar is great on the NEX-6, but shows strong shift on the NEX-7, so very curious about that as well...
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Isaac
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« Reply #22 on: October 29, 2013, 04:31:49 PM »
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The other issues is A Mount users currently have in body stabilisation which works even with vintage 1985 onwards Minolta/Third party lenses, this is a big deal to current A Mount users as they lose this with the new 7 bodies.

Yes. Even though Michael writes -- "They have provided a migration path for those who own Alpha lenses..." I'm afraid my response is not really.
 

On the lenses side I think it was a big yawn all around, big, slower lenses that are priced quite high.

The lenses have been filling out for E mount, and the chances are that they'll fill out for FE.
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