Irix Blackstone 11mm f4 for Nikon F brand_Pentax but this is all Bakelite

but this is all Bakelite

There are some minor coating flaws in the rear element

And it’s still in great shape

Suitable for reflective or transparent materials

Irix Blackstone 11mm f4 for Nikon F brand_Pentax but this is all BakeliteThe Irix 11mm f4 is an ultrawide, rectilinear corrected lens for Nikon F mount. Manual focus, but it's 11mm, so you're probably gonna be fine. This is a unique, high quality lens in excellent condition, designed to provide a corrected ultrawide angle image not fisheye. This lens is the higher spec "Blackstone" model with the metal body. In excellent condition, with clean glass and good function. Includes front and rear caps, plus a form fitted case.