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Lens Ohnar 300 mm f/ 5.6 Mirror

Graham :: 03.06.2023 15:05:29

lvl. 2 (Lens-Adept)

Lens Ohnar 300 mm f/ 5.6 Mirror
Format: 35mm SLR

Type: Prime lens

Focusing: Manual Focus (MF)

Lens mounts: C/Y (contax/yashica), Canon FD, FDn, Konica AR, Nikon F (FX, DX), Olympus OM, Pentax K, Minolta SR (MD, MC)

Optical scheme: 9 elements in 7 groups

Features: Mirror lens


Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr.)Height (mm.)


Graham :: 03.06.2023 15:12:12

lvl. 2 (Lens-Adept)

This is a very curious lens as the one shown is not the standard Ohnar 300mm f5.6 reflex lens - this is the much rarer version which shows a variable aperture.  Now, conventional wisdom has it that a mirror lens always has a fixed aperture, so does anyone here know how Ohnar managed to incorporate a variable aperture into this lens?

The lens has a very distinctive appearance and cannot be mistaken for its more conventional sibling.  I've been looking for one for a long time with no success but as I have Tamron's SP 350mm, it's not exactly a necessity.  But I'm very curious to see just how the variable aperture, if that's what's shown according to the markings on the lens, was achieved.  

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