Posted by Paul A Brierley at 17:19 on 2012 Feb 19
I have Hi-Lux mirror coatings on both my 254mm F4.8 and 200mm F4 Orion Newtonians.And I agree with Gary.They are well worth having, because the reflectivity is better, but also. The life of the mirror coatings is considerably longer, than with out this extra coating.With your 12.5" Dob and HiLux coatings. You will gain an extra inch in light grasp