Our favorite weird lens enthusiast Mathieu Stern described a problem that most of you may have encountered if you often use lens filters for different mounts. Each time you have to use one, you also have to adapt it to the lens mount of your camera. This is especially the case when you’re adapting vintage lenses to digital cameras. Fortunately, he found a solution: a smart lens adapter with a built-in variable ND filter.

The Fotodiox Vizelex ND Throttle lens adapters allow you to mount vintage and modern lenses with one mount to a camera body with a different mount, with the added functionality of a built-in ND filter. This is especially useful for photo and video situations like bright lighting, high-contrast conditions, or using wide apertures for shallow depth of field. In the video above, Stern gives a rundown of the advantages that come with these Fotodiox lens adapters. The most obvious of these is the fact that you no longer have to buy multiple ND filters for each lens.

So, what do you think of this cool lens adapter? Will you be adding it to your go-to vintage lens accessories? Share your thoughts in the comments below!