Great variable ND filter. This filter works great with no distortion even when used at the extreme ends of filter density. Would buy this again.

Paired this with the Canon EF 24-70mm f/2.8L II USM Lens. This is made with Zeiss glass and you can really see the difference with other variable ND filters (no color casting versus the rest!) Typically ND filters cause loss of sharpness when but images produced with the heliopan are nice and sharp!

I can't tell you how much more I recommend this one over others. I've used this with my RED Dragon and Zeiss Milvus lenses and have been very happy with the results.If you're looking for the best variable-ND you can find, Heliopan is it.

Not much to say with regards to the Heliopan Variable ND, other than it is the best quality on the market. I use it for video and it is an essential piece of kit. It is pricey, but you get what you pay for...as they say. Only complaint/drawback is it can't except the native lens cap. But that's a cheap fix. Great item!

Pictures were taken with and without the 77mm Vario Neutral Density Filter by Heliopan. The pictures with filter were jaw dropping beautiful! The colors were deeper, brighter and clearer!

I love the ability to control exposure time with just a turn of the filter ring given I already choose the f-stop to control DOF. Excellent build quality provides a smooth turning operation and given the brass ring easy on/off of the lens.

because it's variable, i can set the lens aperture and adjust the filter to set exposure. very convenient and useful. i used it on a 52mm dia lens with a step-up ring, also by heliopan. fits perfectly. and good quality. clean images even with the filter.

Take out all those other filters and replace them with this beauty. I first was skeptical but this filter has proven itself time and time again. Screws on very easily and adjusts to the right density by rotating the outer ring. the only problem I found was trying to remove it from the case . Heliopan made an excellent filter. I use mine with my 28-300 lens, 77mm and have plenty of extra room in my camera bag. It's hefty enough and weighs in , so you know you won't drop it in handling.

I use this filter for multimedia work so I only have to carry one ND filter and can simply rotate the front to change the density. My favorite part is the built in stops. I've used other fader / variable ND filters that just spin and spin like a normal polarizer filter. With this filter you know when the filter is maxed out on either end. Perhaps the person in the previous review with the x-photograph had a faulty filter without proper stops. I also like that this filter has the same front threads allowing me to use the same lens cap. That's not the case with some filters, such as the Genus, which has a larger front. This also means you can't use your lens hoods (at least on the Canon 24-70 and 70-200 L lenses) with the Genus, but you can with the Heliopan. The ability to use my lens hood is invaluable, as I often work in harsh conditions, blocking not only the sun, but also dirt from motocross tracks, paintballs, etc. from my lens. I compared the Heliopan, Singh-Ray, and the Genus Filters for both sharpness and flare blocking ability. Photographing a test target (tripod, shutter release, mirror lockup) I found the Heliopan to be the sharpest, with the Sing-Ray being very close. Both easily out-performed the Genus. The Sing-Ray did the best job at blocking flare, with Heliopan in second, and Genus in last.

After shooting w/ decent 3-stop ND filter, I realized the importance of quality filters. The image turned out noticeably unsharp. Not AS important for video work, but I planned to use it for both. So I researched and found a review that said the Heliopan and Singh Ray variable ND's were the sharpest w/ least amount of color shift. I ended up with both a 77mm and 67mm Heliopan. It's expensive, but you get what you pay for. My still images are sharp, and video's look great. Worth the cost. One thing to note, I bought my 77mm a while back, and did not have the stops at the extreme ends of rotation, but was easy to rotate. My 67mm I ordered recently, and I noticed there's friction to rotate it, but it had small screws stops. I wish it was easier to rotate.