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great call astro_nut. I did tighten the mirror cell clips abit. but im sure it wasn't 'too' tight though. was kinda scared the whole mirror might flop over! ill have another look into it. Steve, was it hard to collimate my previous F/4? I recalled with the Optex i had similar problems showing the black crescent even though the laser was spot on with both the mirrors. i also had my laser tested for accuracy by Roger at Bintel. seems good.
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