Century Precision Optics WA-7X5X with FA-7X80 lens mount_Nikon F Increases the effective focal length

Increases the effective focal length of the lens mounted to it by forty percent while maintaining complete communication between lens and camera

AN unusual little lens in good working order

In very good condition overall

so it may not need an introduction

It's not very good

Century Precision Optics WA-7X5X with FA-7X80 lens mount_Nikon F Increases the effective focal lengthThe Century Precision Optics WA 7X5X is a pair of nested wide angle adapters that attach to the front of a lens. With the 0. 7x on the lens, and the 0. 5x on top, the focal length is effectively halved; you can also use the 0. 7x without the 0. 5x if you need a more subtle effect. While the 0. 7x optic itself has an uncommon 96mm thread, the included FA 7X80 adapter allows the system to be clamped to lenses with an 80mm outside diameter (eg, many 77mm