Leveraging Tiffen's Magnetic Control System technology, the 82mm MCS Variable ND Filter offers 2 to 8-stops of neutral density with quick and easy attachment. Simply thread the magnetic adapter into the front of the lens and snap the magnetic filter into place when the time comes.

Neutral density filters offer a way to maintain control over depth of field and create special effects. A variable density filter eliminates the need to carry several individual filters. The heavier the density, the longer the exposure, allowing for movement effects like blurred water or streaking car lights in traffic. The filter also allows users to access wider apertures in bright lighting conditions.

Variable 0.6 to 2.4 Optical Density    ColorCore Glass    Magnetic Filter with Threaded Adapter    Simplifies, Expedites Filter Attachment    Eliminates Buying Many ND Filters    Use to Create Blurs/Special Effects

Related Questions and Answers

Q: 1. Does this have stepped or continuously variable attenuation?

A: Steeped, Great attenuator

Q: 2. Does this filter sit in-between the sensor and the adapter, or in-between the adapter and the lens?

A: This filter will mount inside the adapter. It slides into the opening in the adapter.

Q: 3. Anyone have tips for composing/focusing with this. Would live view help at all on a 5D IV? I'm quite nervous about having to take the body and put the filter on in environments that this would be helpful in around waterfalls etc

A: HiCan't speak for the 5D MkIV but on my 5D sr the following is true. Using the EF 11-24 f4 at 100 ISO: with the 3 stopper the image is visible in LiveView, the focus points show and the focus square goes green. The exposure indicated on the screen is broadly correct and the viewed image in camera looks good, sharp and neutral to colour. So this would be the basis for your composition and exposure. As has been said already you will need a sturdy tripod and if you have a centre column collapse it. Focus as normal either Manually of AF but then turn AF off and don't touch the focus ring. Taping up the ring is a good idea as would be making a temporary register mark. Do not move the tripod when you remove the lens from the camera leaving the camera on the tripod of course. Swap out the lightest filter for whatever you wish to use. When you use even the 6 stop you will struggle to see live view for composition (&12 or 16 forget it) and my light meter reading was inaccurate. However, if you have followed the instructions so far when you remount the lens to the camera, you will be looking at the same scene as before. even if you can't actually see it! Double-check that the focus ring is still in the same place and focusing is still set to manual, then all you have to do is calculate the exposure based on the density difference between the first filter (3 stop) and whatever you have chosen. Its not rocket science but you will very soon find that your exposure will be 30 seconds plus so that means Bulb mode and a lockable cable release. The 5D sr has a count-up bulb timer to 999 seconds. You may find this useful, I had a play with the 16 stopper and ended up with a 2 or 3 stop underexposed photo at f4, 999 seconds and ISO silly. The colour noise was terrible but going down to ISO 100 and waiting even longer would probably be much more acceptable. Not sure if there is reciprocity failure at very long exposures but a good light meter would go a long way to finding a start point. Beyond that it is trial and error. Bruce Percy pointed out to me that if your histogram only goes halfway to the right you should at least double your time. Overall as a first look I am impressed with the kit. Undoubtedly very compact, might be a -go back to the car to change filters job- but I am expecting some seriously good results with this item. Hope that helps, probably not for the feint hearted but neither is the price of Lee's SW150, you would need to spend a lot more to get the equivalent filters at 150mm square.

Q: 4. Will this work for a NIkon D610?

A: absolutely. Heavy though. Needs a counter-weight that doesn't come with it.

Q: 5. Can these filters be used at full 11mm zoom on Canon 11-24 f4 lens? Read somewhere that some of these rear mount filters can damage lens and not recommended to use filter in the lens rear filter slot at the widest zoom because the rear glass element will hit the filter.

A: Yes it can be used throughout the full zoom range on the 11-24mm and it will not damage the lens.

Q: 6. Does this filter work for the solar eclipse?

A: Yes, the Aurora-Aperture Adapter Mount Format PowerND 4.8 Filter for Nikon FTZ Lens Mount Adapter (16-Stop) can work for solar photography but I would recommend a filter that goes onto the front element of the lens to avoid any damage that can pass through internally.

Q: 7. Can this work for both mc-21 and mc-11. I just want to avoid buying 2 pairs of same filtering

A: It is for the MC-21 adapter only. They make this one for the MC-11: B&H # AUPNDMC11N64 MFR # PND-MC11-ND64 https://bhpho.to/3fRDEiL

Q: 8. Do these filters work on both the EF-L and the SA-L version of the MC-21 converter?

A: The Aurora-Aperture Adapter Mount Format PowerND 3.6 Filter for Sigma MC-21 Lens Mount Adapter (12-Stop) is compatible with the Sigma MC-21 Mount Converter/Lens Adapter (Sigma EF-Mount Lenses to L-Mount Camera) and the Sigma MC-21 Mount Converter/Lens Adapter (Sigma SA-Mount Lenses to L-Mount Camera).

Q: 9. is this Reversible ?

A: it's not Reversible at all if you need to use it you need to keep it on the lens with no any Reversible also you cant add filters same time

Q: 10. Does it fit Canon

A: NO idea.