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SW Evostar 150 f8 achromat - collimation?

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The older ones branded Helios and Konus are generally fitted with a non-collimatable objective lens cell but the later ones and all the ones branded Sky-Watcher have objective cells with a push-pull screw type collimation facility.

Edit: I did note that the latest "black diamond" Sky-Watcher Evostar 150's seem to have gone back to a non-collimatable objective cell, if the photos of them are accurate.

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My old Helios doesn't have any, Ken, but a favourite trick was to hold the tube vertically with the EP end restiong on the ground and then tap the tube with your fingers for a few minutes!


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