Century Precision Optics WA-7X5X with FA-7X80  type_Instant Black & White 6x for APS-C and Micro

6x for APS-C and  Micro Four Thirds

Replaced the tripod plate

this lens is clearly not meant for day to day shooting: it produces a circular image in the middle of the frame

The SMC Pentax-M 135mm f3

Century Precision Optics WA-7X5X with FA-7X80 &nbsptype_Instant Black & White 6x for APS-C and MicroThe 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