Slider Features (featslid.htm) - Van Slyke Instruments
All Sliders have a FREE zero profile, built-in 2" filter slot and easy X-Y adjustable slide-mirror for "DEAD-ON" collimation. Sliders have rock-solid, 1/4" ... And, I guarantee you won't find anything else on the market that even comes close to the capabilities of the Slider 2 in form, function or features. Better yet, you could ...
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observatory's website is observatory.org