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H&Y REVORING is a unique one-size-fits all filter design, and it’s coming soon

(Image credit: H&Y Filters)

One of the biggest drawbacks to regular circular filters is that lens filter threads come in many different sizes and you need to buy a filter for each. The REVORING gets round this with a clever spring-loaded retractable blade design that can fit a whole range of filter sizes.

The REVORING comes in two forms. The standard REVORING will simply act as a step-down filter that enables to fit larger circular filters on to a range of smaller filter threads. The REVORING Variable Neutral Density + Circular Polariser uses the same multi-size mechanism but consists of both variable ND and polarising filters (see below).


The H&Y REVORING uses spring-loaded blades to match the circumference of a whole rang of filter thread sizes. (Image credit: H&Y Filters)


As it happens, a single REVORING size does not fit ALL filter threads. It would be a bit impractical (and expensive) to step an 82mm filter down to a lens with a 37mm thread, for example.

Instead, the REVORING will come in three sizes:

37-49mm, using 52mm filters

46-62mm, using 67mm filters

67-82mm, using 82mm filters

There is also a possibility of a larger 82-95mm size as a 'stretch goal', subject to funding.

The REVORING adaptor has two rings. You hold the outer ring and then turn the inner ring against spring pressure to extend the blades to create a smaller circumference for smaller filter sizes. You then hold the two rings in this position to attach the REVORING to your lens. As you release the spring pressure, the blades retract to fit the filter thread.


The REVORING Variable Neutral Density + Circular Polariser could be very useful to videographers working with a range of different lenses. Variable NDs are especially useful in video for controlling light levels without having to use fast shutter speeds or change iris settings, and hence the look of the footage. (Image credit: H&Y Filters)

H&Y REVORING Variable Neutral Density + Circular Polariser

Variable ND filters and polarisers are traditionally sold separately, but they both use polarising filters and H&Y uses this fact to provide both types in one filter.

The variable ND strength can be varied between ND3-ND1000 (10 stops maximum) by turning a slim outer ring. The polarizing filter angle is changed using a larger ring with small milled metal lever. To use it, we imagine you would choose your desired ND setting and then adjust the polariser.

Production versions will have hard a hard stop for the maximum 10x ND effect and laser markings to help anticipate ‘crossfade’ effects at different focal lengths (a by-product of using paired circular polarisers for variable ND effects).

The REVORING Variable Neutral Density + Circular Polariser uses German Schott B270® glass with ​Anti-Reflective coating for up to 97% light transmission and designed for sharp images even with10 stop exposures. This filter also has Anti-Fingerprint & Waterproof Nano-Coating to helps with beading from water droplets and allow easier cleaning. 


The H&Y REVORING Variable Neutral Density + Circular Polariser has a front ring for controlling the ND strength and a second ring (with lever) for the circular polariser. (Image credit: H&Y Filters)

H&Y REVORING price and availability

The H&Y REVORING Kickstarter campaign launches on June 29 and will run for 40 days until August 8 2020. The release data has yet to be confirmed, but prices are expected to be as follows:

Standard ​REVORING:​ USD $35-$45

REVORING​ Variable Neutral Density + Circular Polariser: USD $184-$239

You can find out more at the H&Y Revoring website

Read more:

Filters, and why we need them!
The best variable ND filters
Best ND filters
Best polarising filters

Rod Lawton

Rod is the Group Reviews editor for Digital Camera World and across Future's entire photography portfolio, with decades of experience with cameras of all kinds. Previously he has been technique editor on N-Photo, Head of Testing for the photography division and Camera Channel editor on TechRadar. He has been writing about photography technique, photo editing and digital cameras since they first appeared, and before that began his career writing about film photography. He has used and reviewed practically every interchangeable lens camera launched in the past 20 years, from entry-level DSLRs to medium format cameras, together with lenses, tripods, gimbals, light meters, camera bags and more.