Quote:
Originally Posted by Profiler
Yes - but the hypothetical was who honestly thinks a 10 year old Synta tech dob will be in one piece with a functional mirror with coatings etc
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The 3.9m telescope at Coonabarabran has to get a new coat every six months
Recoats are just basic maintenence- kind of the tax you pay for getting all that light so cheaply! We have allready seen in other recent threads that an 8" refractor free of false colour ( as a reflector is ) can cost around $250,000 .....You would not expect to run your car for 10 years without changing the oil regularly.
That being said , to my knowledge 98% of all the mirrors I have made with a basic quartz overcoat are still in service with their original coatings many which are coming up to 15 years old.