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Thread started 15 Jul 2015 (Wednesday) 08:08
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Sigma lenses - why no E-mount?

 
Shadowblade
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Jul 15, 2015 22:48 |  #16

thenextguy wrote in post #17632772 (external link)
I'm trying to find the original interview, but I do remember one of the Sigma executives saying that the E-Mount is a difficult mount to make lenses for. (This could explain why there's so much in-camera corrections.)

That being said, they have since said they will make E-mount lenses.

http://photorumors.com …lenses-for-sony-fe-mount/ (external link)

It's difficult to make dedicated, more compact lenses that take advantage of E-mount's shorter flange distance, particularly for UWAs (you still need a retrofocus design to reduce the angle of incidence of light hitting the sensor)

It's ridiculously easy to make an ordinary SLR lens perform just as well on an E-mount, if you're not also trying to make it smaller. It essentially consists of taking off the SLR mount and replacing it with a Metabones adapter, inbuilt/permanently bolted to the lens.




  
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Shadowblade
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Jul 15, 2015 22:53 |  #17

There's a huge market for non-tiny, full-featured E-mount lenses, with more and more pro users moving towards the A7 series (and likely the A9, when it comes out). Many of us want full-featured lenses, with no compromises on aperture or image quality. We didn't buy the Sony for its small size, but for its performance, and we don't choose lenses based on small size either (within reason - not too many SigZillas out there). Right now, the biggest beneficiary is probably Metabones. It wouldn't take much for Sigma to make their lenses in an E-mount version (no redesign needed) and join the party.




  
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markd61
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Jul 25, 2015 21:47 as a reply to  @ Shadowblade's post |  #18

I agree with your assessment of the lens situation as it stands.
I appreciate what Metabones has done in the way of its adapters but as others have noted adapters can easily introduce errors in planarity of the lens WTR the sensor leading to focus issues across the plane.

With lower res cameras this is not an issue but at the higher res it starts to have an impact on the IQ that we paid for.
That is why I would like to see more offerings from third party suppliers to move us away from the compromise of adapted lenses.




  
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Shadowblade
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Jul 26, 2015 04:10 |  #19

markd61 wrote in post #17644420 (external link)
I agree with your assessment of the lens situation as it stands.
I appreciate what Metabones has done in the way of its adapters but as others have noted adapters can easily introduce errors in planarity of the lens WTR the sensor leading to focus issues across the plane.

With lower res cameras this is not an issue but at the higher res it starts to have an impact on the IQ that we paid for.
That is why I would like to see more offerings from third party suppliers to move us away from the compromise of adapted lenses.


Not that an adapter is any worse than a teleconverter in that regard. Probably better, because it's lighter, thinner and contains no optical elements.

In addition to making more third-party lenses in E-mount, I think there would also be a big market for Metabones, or someone else, to offer custom conversions of existing Canon or Nikon lenses - that is, instead of using an adapter, actually manufacturing lens mounts that can replace the lens mount on the back of an EF lens and turn it into a native E-mount lens, and offering the mount conversion as a service. After all, we already have conversion services to turn cameras into IR, UV or monochrome sensors, and changing the mount on a lens is trivial in comparison.




  
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Sigma lenses - why no E-mount?
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