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    What lens to get the smallest dot size possible with 405nm @ ~250mm?

    Hello What lens should i use for 405nm laser if i am after the smallest dot size possible at 200-300mm focal length? I am not concerned about power losses (50% would propably be OK), but i want a round small spot from a standard 405nm laser module (this is for building a galvo based SLA 3D...


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