Amateur Photographer verdictThe Kase Revolution Ring is a neat device that lets you share a single filter size across multiple lens threads. It provides quick one-handed operation and integrates well with Kases other products.ProsEasy one-handed operationWorks with Kase Armor filter systemCompatible with Kase Revolution Plus magnetic circular filtersConsRelatively expensive The Kase Revolution Ring is a variable step-up ring that allows filters to be used on lenses with a range of different thread sizes. The version I tested takes 82mm filters, and fits onto lenses with thread sizes from 67mm through to 82mm. This means you could use a single set of 82mm filters across an array of pro zooms and fast primes, without needing to carry different step-up rings for each size of thread.

　　Kase Revolution Ring at a glance: $70 / £70 Employs 82mm filters Fits filter threads from 67mm to 82mm Works with magnetic circular filters Works with Kase Armour 100mm filter system kasefilters.com If this idea looks familiar, thats because the Revolution Ring does essentially the same thing as the HY Revoring, which has been around for some time. However, its easier to use, and its nicely integrated with Kases other filter systems, which could be a big advantage for existing users.

　　Operationally, the Kase Revolution Ring works via two large spring-loaded buttons placed diametrically opposite each other. Pushing these inwards retracts four ‘claws’ to their closed position. Release the buttons, and those claws spring back out and grip your lens’s filter thread tightly. This design makes the Revolution Ring very quick and easy to mount and remove using just one hand.

　　Kase Revolution Ring key features: Thread: The Revolution Ring has an 82mm thread for screw-in filters. You can also use Kase magnetic filters via an inlaid adapter Filter thread compatibility: You can use this adapter to fit filters onto lenses with thread sizes from 67mm to 82mm One-handed operation: The Revolution Ring is really easy to use, via two large push-buttons Low profile: The design places filters close to the front of the lens to minimise vignetting While the device is threaded for conventional 82mm filters, arguably it comes into its own when used with Kase’s Revolution Plus magnetic circular filters. To use these, firstly you have to screw in a magnetic inlaid ring. Then filters simply snap on and off magnetically, which is much quicker and easier than screwing them on and off. This in turn means you’re far more likely to use filters creatively, and less likely to miss shots while changing them.

　　The Revolution Ring can also be used as a base for the Kase Armor 100mm filter system, with the square filter holder simply clipping onto it magnetically. Unfortunately, I didn’t have the opportunity to test this myself. But in principle, it should make switching the filter holder from one lens to another extremely quick and easy, without having to remember to carry an adapter ring for each.

　　In practical use, I found the Revolution Ring works very well. It’s nicely made from aluminium, with a slimline design that holds filters close to the front of the lens to minimise the risk of vignetting. Filters screw on and off smoothly, too. In short, everything behaves exactly as it should.

　　I tested it on my Sony A7R V using the FE 16-35mm F4 ZA OSS and FE 24-105mm F4 G OSS lenses the latter in particular is notorious for needing thin filters. Using a slim-frame 82mm screw-in filter, I saw no hint of vignetting with either lens at their widest settings. With a single Revolution Plus magnetic filter, though, the extreme corners of the frame get slightly blocked, which becomes most visible at small apertures.

　　In most cases, though, this could easily be fixed by fractionally cropping or zooming-in, or a bit of cloning. In fact, if you’re shooting in any aspect ratio other than 3:2, they’ll get cropped out anyway.

　　Kase Revolution Ring: Our Verdict If you use lenses with different threads but want to carry a single size of filters, the Kase Revolution Ring could be just the ticket. It works really well, and its easy one-handed operation is a clear advantage over the similar HY RevoRing, which requires two hands to operate (and sometimes feels like it needs more!). However, it’s much more expensive than simply getting a set of step-up rings, so everything depends on how much you value the convenience and speed of operation it brings.

　　Related reading:

　　Kase Revolution Magnetic Circular filters review Kase Wolverine K9 100mm filter system review HY RevoRing Variable Adapter Ring Review Do you want to win some great prizes for your photography? Enter your photos in our International Amateur Photographer of the Year competition. Free entry for photographers aged 13-21.

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