Calumet Caltar II-N 135mm f5.6 MC grip it's a less sophisticated design

it's a less sophisticated design housed in a slightly less heavy-duty barrel

Nikon Reflex-Nikkor 500mm f8 is a reflex telephoto lens for Nikon F mount

and the whole thing runs on a pair of standard button cells (included)

8-4 is a telephoto zoom lens with an interchangeable Tamron Adaptall mount (a Pentax K mount is included)

8 is a compact portrait lens with a fast aperture and lovely image quality

Calumet Caltar II-N 135mm f5.6 MC grip it's a less sophisticated designCalumet Caltar II N 135mmmm f5. 6 MC for 4x5 in excellent condition, with clean optics and an accurate Copal 0 shutter. Includes retaining ring. Small enough to fold up inside many field cameras (but you should make sure it works with yours!) This is a Calumet rebrand of the Rodenstock Sironar N lens.