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Thats correct its about an F3 device. It would still do a "fair" job of collimating the scope but not as good a job as the correct tool. If your scope was F6 or slower I would say go ahead and use that tool as collimation accuracy is less critical in slower scopes. Owning an F5 scope I would really be inclined to get the correct cheshire/sight tube particularly if you want to get the best performance possible from your scope for high power viewing of planets/lunar and double stars.
CS-John B
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