FotoDiox ND Throttle Variable ND Filter Lens Adapter for Sony A7sII A7RII GH4

While I see many people switching over to the Panasonic GH4 and Sony A7 series cameras (like the A7sII/A7RII), there's one product that I wanted to remind people about - the FotoDiox ND Throttle. When shooting with Sony cameras, especially in SLOG, the minimum ISO could be anywhere from 1600-3200. SLOG is such a great option to have, but means you really have to deal with ND Filters to keep a wide aperture and proper shutter speed.

The easiest and most simple solution that I know of is the FotoDiox ND Throttle. The FotoDiox ND Throttle is a variable ND Filter built right into a lens adapter, and allows you to dial in your exposure without changing your ISO, Shutter, and Aperture. Of course this only works if you are adapting a Full Frame lens to the Sony or Panasonic, and not using a native lens.

It doesn't matter if you're working with a Canon EF autofocus lens, a manual Rokinon Lens, or even high end Cinema Prime Lenses like the
XEEN, Canon CN-E, Zeiss CP.2, etc. The FotoDiox ND Throttle is one simple adapter that I highly suggest all Sony A7 series or GH4 shooters look into and find the time to try it out. Even if you're not using it all the time, I think you'll find it's worth keeping in the gear bag.

fotodiox nd throttle adapter sony a7s a7rii nex fe mountpanasonic gh4 nd throttle lens adapter canon ef variable nd filter
VIEW-ITEM FotoDiox ND Throttle Variable ND Filter + Lens Adapter

So while I think Canon L lenses offer great image quality, you can get a (4) piece Rokinon Cine DS Lens Bundle Set for about the price of one Canon L Lens. The DS line from Rokinon are designed to be color matched, same exposure ranges, common focus and iris gear positions, a de-clicked aperture, etc. For me personally I feel they are better for video than standard Autofocus Photo Lenses (image quality aside). If you're looking into a set of Rokinon Cine lenses, I highly suggest starting with the 'Cine DS' line for the reasons stated above.

The image quality is great, and I think you'll really appreciate the longer focus (pull) throw, and de-clicked aperture which lets you set F-stops in smaller increments than you can with auto focus lenses. The built in gear ring is great for follow focuses, and the standard positions make it easier to swap lenses without moving your FF around each time.

Rokinon Cine DS Lens Canon EF
VIEW-ITEM Rokinon Cine DS Lens Bundle for Canon EF Mount

Now if you really want to step it up a bit, the Rokinon XEEN Cinema Prime lenses have a standard physical size, lens diameter, better optics, less breathing, etc. To date they are probably the most affordable Cinema Prime Lenses that cover a full frame sensor. They have a 114mm Diameter which is exactly the same as a Canon CN-E Prime, or Zeiss CP.2. You can find great deals on XEEN Lens Sets via eBay (click here).

Rokinon XEEN 3 Lens Bundle Set
VIEW-ITEM Rokinon XEEN Lens Bundle

16 thoughts on “FotoDiox ND Throttle Variable ND Filter Lens Adapter for Sony A7sII A7RII GH4

  1. @Danny - A system like that wouldn't work because you would be physically moving the lens further from the sensor. Think about a magnifying glass that you would use to burn paper with the sun. You have to physically move that magnifying glass closer or further from the paper to make that light focus properly.

    The only reason it works with this Canon lens is because the lens is designed to work with a different sensor size. So in order for the Canon lens to focus the image properly to a Sony sensor you need to move it further from the sensor. Now that gap can be filled with a normal adapter or an adapter like this with a build in ND.

  2. martin

    Any recommendations on adapters for Sony's a6000 and Nikon lenses? I have Nikon lenses with and without aperture rings.

  3. Emm

    Post author

    @Otto - Correct, you won't have any communication with the lens. This is another reason why I wanted to move to more manual lenses, especially cinema or video lenses. Having a de-clicked aperture not only allows you to control the iris, but you actually have more options for F-stop. You can move it 'in between' typical f-stops only found on autofocus lenses.

  4. Emm

    Post author

    @Satva - I don't think that's possible. For lenses to be properly focused there is a fixed distance between the rear element of the lens and the sensor. If you move the lens away then the sensor will not see a focused image. These lens adapters only work because we are using lenses for larger sensor cameras (big rear glass element) and in order for the small sensor to see the image in focus the lens has to be moved further away - hence lens adapters. In fact, very cheap lens adapters that aren't designed to exact flange distances (even just 1mm or 2mm off) will cause infinity focus problems with your lens, or appear to be very soft and slightly out of focus. Not many people think about this, but it's very important that if you choose a lens adapter, it has to be made to exact tolerances for the sharpest possible image.

  5. Emm

    Post author

    @JSS - Well, for the sony A7sII it's probably not worth getting a speedbooster adapter, but the only electronic adapters i've been using is the Metabones IV. Been solid so far on these newer Sony cameras, but I don't use many EF lenses these days.

  6. For the Ursa Mini 4.6K I hope Fotodiox releases a ND throttle Canon EF - Canon EF so we can use Rokinon lenses on the Mini Ursa and have ND control

  7. JSS

    What timing Emm, I'm just about to pull the trigger on getting a sony A7S ii and was wondering about adapters. Aside from this one are there any other ones that you recommend. Specifically Canon EF to EMount. What about adapters that have pass through electronic control like the metabones. I've heard they aren't worth the money. Thanks for all the info and help.

  8. Emm

    Post author

    @Coppa - The cage is a Varavon Zeus for Sony A7sII, but the rig is one I built from pieces. You'll find most of the parts in this article: httpss://

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