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Histórico da introdução: Repairing Tento 10x50 binoculars Image alignment (psuedo-collimation aka conditional alignment)

Edição por Phil Jones —

Edição aprovada por Phil Jones

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Introduction
I was given these wonderful "Made in the USSR" binoculars by my father to view Halley's Comet in 1986. They were recommended by Patrick Moore. Halley's Comet is due to return in 2061. All being well, I shall be 88 years old and will see it again - using the same binoculars - with their evocative smell of old RAF jet airplane cockpits.

Imagine my dismay when they got dropped, then were misaligned! They were in their box at the time, but that was enough to make the image look doubled. Turns out the reason was the prisms had been displaced slightly. Now, the Soviets made these to last, right?
Better binoculars than these, have adjustment screws at the sides, and adjustable objective (big front) lenses. This is not "true" collimation. Having said all that, this is what I did to get them usable again. Perhaps this might help with fixing other binoculars, too.