[. . . ] The SolarMax 40 telescope requires the following equipment for double stacking: 1. [. . . ] Start with both T-Max in the closed position while looking thru the eyepiece adjust the furthest T-Max to remove ghost images and use the closest T-Max for Doppler shifting. Contact Coronado directly for pricing and to schedule your upgrade Å/°C can be . An or a second external etalon & T-Max tuner can be matched and installed. The SolarMax 90 telescope can be ordered this way or later upgraded by Coronado. Contact Coronado for details. Å/°C Coronado Instruments, Inc. Limited Warranty 27 Hubble, Irvine, CA 92618 Phone: 949-451-1450 RGA Number Required: Prior to the return of any product or part, a Return Goods Authorization (RGA) number must be obtained from Meade by writing or calling (949) 451-1450. [. . . ] Each returned part or product must include a written statement detailing the nature of the claimed defect, as well as the owner's name, address and phone number. Complete this form; make a copy for your records and mail to Coronado. This warranty gives you specific rights. [. . . ]