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Lens 3M-5SA 500 mm f/ 8.0
 | Marco Bensi :: 01.07.2017 00:15:54 lvl. 2 (Lens-Adept) |
Lens 3M-5SA 500 mm f/ 8.0
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| | Marco Bensi :: 01.07.2017 00:21:19 lvl. 2 (Lens-Adept) |
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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