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Lens 3M-5SA 500 mm f/ 8.0


1.
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 lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr.)Height (mm.)
500mmf/8.0f/8.0no472620139

 

2.
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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