SlashScope

Doug Peterson reviews some Celestron Ultima 100ED spotting scopes and shares his reservations in this review. 'Having worked in military optics QA for many years, I can tell you the Dirty Little Secret about optics: they vary from unit to unit. If the allowable deviation is tight, as in Takahashi and Questar, who have specified in print a 1/8 wave tolerance, the probability of a true lemon is rare, but not unheard of. If the allowable deviation is not specified, then it is anyone’s guess as to what you will get. At this point you must trust the manufacturer’s reputation. Even Meade and Celestron, who have a generally good reputation for quality in their larger apertures, have a different reputation for their imported.'