You would be able to mount Sony Alpha lenses to an NEX body, by using one of these adapters:With autofocus and aperture control:Sony A-Mount to E-Mount Lens Adapter with Translucent Mirror Technology (Black)B&H # SOLAEA4 Mfr # LAEA4With aperture control:Sony A-Mount to E-Mount Lens Adapter (Black)B&H # SOLAEA3 Mfr # LAEA3

As the Sony 100mm f/2.8 Alpha A-Mount Macro Lens is an older lens that was originally released in 2006, and it is a macro lens, it has slower autofocus compared to newer lenses, or non-macro lenses. The Sony 100mm f/2.8 Alpha A-Mount Macro Lens was based on Minolta's lens design. Due to the longer focus range from infinity focus to 1:1 macro focus, the Sony 100mm f/2.8 Macro lens does focus slower than non-macro lenses and newer lenses with faster motors. However, it is a full-frame lens and is an extremely sharp option, even at f/2.8, and would be compatible for use on the Sony Alpha a99 DSLR Camera. The lens does have a focus limiter switch which would allow you to either limit the focus range on the long end of the focus range when using it as a standard lens, or limit the focus range in the macro range to speed up autofocus performance (it prevents the lens from having to travel through the entire focus range from 1:1 to infinity). For a Sony A-mount/Minolta MAXXUM mount macro lens near the same focal length that would have faster autofocusing performance, I would recommend either the Sigma 105mm f/2.8 EX DG OS Macro Lens for Sony Cameras, B&H # SI10528MDGSM, or or the Tamron 90mm f/2.8 SP Di MACRO 1:1 USD Lens for Sony, B&H # TA9028S.

The Sony Alpha a7 Mirrorless Digital Camera and the Sony Alpha a7II Mirrorless Digital Camera both use the Sony E-mount, while the Sony 100mm f/2.8 Alpha A-Mount Macro Lens uses the larger Sony A-mount. Unfortunately, the two items are not directly compatible. In order to connect the Sony 100mm f/2.8 Alpha A-Mount Macro Lens to the Sony a7 and a7II Mirrorless Digital Cameras, you would have to purchase a lens adapter, such as either the Sony A-Mount to E-Mount Lens Adapter with Translucent Mirror Technology (Black), B&H # SOLAEA4, or the Sony A-Mount to E-Mount Lens Adapter (Black),B&H # SOLAEA3.

It is very comparable, image quality is very good.

Hi S, the best compatibility which includes speed and focusing will favor the native mount. That means Sony a7R will work better with a native Full frame E-mount lenses.

No, it doesn't.

Yes it is a 35mm full frame lens. I use it on my A99 full frame camera and it works great!I use it mainly for the macro close-up, but it also works great as a portrait lens.Also note that it works great on my smaller C sensor A77 camera.