Re: Industry News: Nikon Announces Development of Next Generation Full-Frame Mirrorless Camera and N
To be clear, I didn’t see any significant problems - in my own use. I did not compare adapted to non-adapted, nor collect laboratory data, much less set up test equipment using one. Rather I shot tens of thousands of images with adapted glass and a sole sample adapter, with acceptable results.
Similarly I’ve shot tens of thousands of images with what some lab testing would consider poor dynamic range, also with acceptable results.
I obviously accept that mounting a lens off-parallel will manifest in image degradation (increasing as the angle between grows), and maybe a large sample of adapters from a third party, poorly funded operation demonstrates a trend... about that poorly funded operation. But if nikon can make a camera and lens combination, I have confidence they can make a camera, lens, and adapter combination. Canon too. Sure it adds tolerance contributions, but it’s simple geometry, and the OEM is likely to do it well since they’d have nobody to point fingers at. 2-4 more interfaces isn’t all that many in the context of a camera and lens combination, where you may have 12 elements in the lens alone, the mount to lens, mount to body, body to sensor assembly, sensor assembly to semiconductor, etc.
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I didn't go back to read the LR blog on that topic but maybe it's that off-center image degradation with adapted lenses has more to do with differences in filter-stack refraction affecting off-center focus than mechanical misalignment.
Variation in the total amount of glass different Mfrs use in their filter stacks is considerable.
You can sometimes see this in the different edge performance of different camera brands when used with the same model of 3rd-party lenses too.
Didn't early Speedbooster adapters have an issue with this too until they redesigned their optics to compensate for the filter stack on the host body?
Old film-era glass adapted to a digicam with a filter stack is also likely to have some degraded off center performance too. How much these effects occur probably depends on how close the rear lens element is to the sensor and the incident light angles.
So that's the optics.
As far as the mechanics go for making an F-mount to MILC adapter, it's not a big deal to make a tiny motor drive to turn those mechanical AF lenses and Nikon could probably come up with a clever way to drive the aperture lever too, if they want to.
Pellicle mirror in the adapter?..
Why even bother? It's likely more for the sake of a patent.
Why not just drive the lens focus using the same OOF data the sensor would obtain from a native lens? it may be a bit slower but it will still work. CDAF works well enough for non-action shooting. We may not get AF-P speeds out of adapted lenses but.. we never had that speed from them in their native mode anyway.
A well designed and precision mfd F to Z(?) adapter could work just fine.
Intro pricing of the system...
THAT is important.
3kramd5 said:neuroanatomist said:3kramd5 said:Either way, I’ve not seen any significant problems from poor parallelism tolerance; it’s an easy configuration.
Perhaps you haven't, but have you actually looked? Uncle Rog has, and his conclusion was:
[quote author=Roger Cicala @ lensrentals.com]
I won’t bore you with another 20 graphs that look pretty much like these. We tried Leica to NEX and Leica to Micro 4/3 adapters, Canon to NEX, etc. We tried different lenses on one adapter. It didn’t really matter. None of them would be acceptable for testing. Not one.
...
In the examples above, though, center resolution is pretty much unchanged, it’s only when you get away from center that you start to see issues. So someone shooting portraits and centered subjects is unlikely to notice an issue. A landscape photographer, though, would likely see some problems along the edges of the image.
Putting a great lens on your camera via an adapter might still be better than an average native-mount lens. On the other hand, that great lens certainly wouldn’t be as good as it would be on its native-mount camera.
Read the article here:
https://www.lensrentals.com/blog/2013/09/there-is-no-free-lunch-episode-763-lens-adapters/
AvTvM, I'd advise against clicking that link...you'll find Data on the other side of it, and I know that's anathema to you. You just go on ignoring facts and believing that an adapter is the best solution for a Canon FF MILC, that it won't cause any optical problems at all. Enjoy your free lunch. :
To be clear, I didn’t see any significant problems - in my own use. I did not compare adapted to non-adapted, nor collect laboratory data, much less set up test equipment using one. Rather I shot tens of thousands of images with adapted glass and a sole sample adapter, with acceptable results.
Similarly I’ve shot tens of thousands of images with what some lab testing would consider poor dynamic range, also with acceptable results.
I obviously accept that mounting a lens off-parallel will manifest in image degradation (increasing as the angle between grows), and maybe a large sample of adapters from a third party, poorly funded operation demonstrates a trend... about that poorly funded operation. But if nikon can make a camera and lens combination, I have confidence they can make a camera, lens, and adapter combination. Canon too. Sure it adds tolerance contributions, but it’s simple geometry, and the OEM is likely to do it well since they’d have nobody to point fingers at. 2-4 more interfaces isn’t all that many in the context of a camera and lens combination, where you may have 12 elements in the lens alone, the mount to lens, mount to body, body to sensor assembly, sensor assembly to semiconductor, etc.
[/quote]
I didn't go back to read the LR blog on that topic but maybe it's that off-center image degradation with adapted lenses has more to do with differences in filter-stack refraction affecting off-center focus than mechanical misalignment.
Variation in the total amount of glass different Mfrs use in their filter stacks is considerable.
You can sometimes see this in the different edge performance of different camera brands when used with the same model of 3rd-party lenses too.
Didn't early Speedbooster adapters have an issue with this too until they redesigned their optics to compensate for the filter stack on the host body?
Old film-era glass adapted to a digicam with a filter stack is also likely to have some degraded off center performance too. How much these effects occur probably depends on how close the rear lens element is to the sensor and the incident light angles.
So that's the optics.
As far as the mechanics go for making an F-mount to MILC adapter, it's not a big deal to make a tiny motor drive to turn those mechanical AF lenses and Nikon could probably come up with a clever way to drive the aperture lever too, if they want to.
Pellicle mirror in the adapter?..
Why even bother? It's likely more for the sake of a patent.
Why not just drive the lens focus using the same OOF data the sensor would obtain from a native lens? it may be a bit slower but it will still work. CDAF works well enough for non-action shooting. We may not get AF-P speeds out of adapted lenses but.. we never had that speed from them in their native mode anyway.
A well designed and precision mfd F to Z(?) adapter could work just fine.
Intro pricing of the system...
THAT is important.
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