P1020592

.23mm (.009 inch) electric guitar wire and 22.5mm edmund optics diag mirror (reflective diameter 20.5mm) -15% diameter obstruction of main mirror. Area obstruction of main mirror by diagonal plus wire is about 2.8%. Wire is attached to bits of old circuit board which is strong & I assume effects little abrasion on the thin wire as otherwise why would it be used to hold delicate circuitry !. The diagonal mirror is quoted as having 1/8th wave accuracy which isn't as good as other makes claims. I initially ordered a quartz mirror from Protostar but this company seems to have problems fulfilling orders as it took my money but provided no evidence of posting and I never received it nor any reimbursement despite polite requests by email and letter.