Lens 3M-5SA 500 mm f/ 8.0

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Lens 3M-5SA 500 mm f/ 8.0

Lens Database Discussion

Marco Bensi :: 01.07.2017 00:15:54

lvl. 1 (Lens-Learner)

Lens 3M-5SA 500 mm f/ 8.0

Format: 35mm SLR

Type: Prime lens

Focusing: Manual Focus (MF)

Lens mounts: M39, M42, Nikon F (FX, DX), Pentax K

First year of production: 1983

Last year of production: 1991

Optical scheme: 5 elements, 2 mirrors

Features: Mirror lens

Optical scheme

Specifications:

Focal length	Max. aperture	Min. aperture	Blades	Min. Focus (m.)	Filter Ø (mm.)	Weight (gr.)	Height (mm.)
500mm	f/8.0	f/8.0	no	4	72	620	139

quote :: Reply

Marco Bensi :: 01.07.2017 00:21:19

lvl. 1 (Lens-Learner)

I wanted to point out that very often ... the Ottiches and Russian mirror have had a factory installation somewhat exaggerated.

I'll explain...

My MC 3m 5SA just bought me disappointed in sharpness.

Then I found out why ... the primary mirror had been too tight with the sealing ring and suffered tensions that changed its surface.

I dismantled and reassembled the whole goal carefully ... but in particular I was very attentive to the pressure exerted on the primary spec.

After my intervention ... it's a great 500mm mirror.

More than 90% of its peers.

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Lens 3M-5SA 500 mm f/ 8.0