Aperture Introduces Mirrorless Adapter Mount Format Filters

Aurora Aperture recently announced a new an interesting product line as a Kickstarter project – this project called Adapter Mount Format Filter (AMF) is made out of a number of different filters which are compatible with 4 existing DSLR to mirrorless lens adaptors and are significantly smaller and more affordable than screw in-adaptors while providing some important image quality benefits.

If you are using adapted DSLR lenses on your mirrorless, there is a good chance that the new AMF filter system might interest you. The idea is pretty straight forward and Canon was one of the first companies to introduce its own version of small filters for their EF to RF mount adaptors when the EOS R was first introduced in 2018.

Aurora Aperture took the concept one step further by providing a  more extensive range of filters and wider supported adaptors including the aforementioned Canon EF-RF Mount Adapter, the
Nikon FTZ, Canon EF to Sony E with Sigma MC-11 EF-E and the L-Mount with Sigma MC-21 EF-L.

In terms of filters there are currently:

  • Sensor protector
  • ND filters – based on the PowerND fixed ND filter family, with strengths of light reduction capabilities from 2, 4, 6, 8, 12, to 16 stops.
  • Graduated ND in three different strengths – 1.5 stops, 2.5 stops and 3.5 stops.
  • Light pollution reduction (LPR) filter.

Besides price and size, there are a number of benefits to using these small filters that go into the adaptor over the screw-in filters. First, for ultra-wide-angle lenses, you might not be able to attach a circular filter and need a large and expensive front filter system. You will also not need step-up rings since one size of filter will be good for any size lens.

Finally, there is the matter of image quality. According to Aurora Aperture their filters use German Schott SuperWhite B270® glass with nano-coating and will have zero vignetting caused by the filter since it sits in the middle of a light path.

All filters are currently on Kickstarter (it is worth mentioning that the project already reached its goal and that Aurora Aperture already successfully completed several previous Kickstarter projects which we reported on and reviewed). A single filter will cost you $44 and a set of 4 will cost you $164 (see the Kickstarter page).

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