Quote:
Originally Posted by Stefan Buda
I finished the small lenses, except for the AR coatings.
For the coatings I can think of three possible options:
1. Find someone that can BBAR coat them for me.
2. Just do my own single layer magnesium fluoride AR coating.
3. Upgrade my vacuum system and do my own BBAR coating.
Problem with the first option is that I'm not aware of anyone doing commercial BBAR coatings in Australia, except for spectacle makers perhaps.
Problem with the second option is that single layer AR coating on low index crown glass is not as good as BBAR - 1% vs 0.25% reflectivity per surface across the spectrum.
Problem with number three: Big learning curve.
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Stefan,
Longman Optical in Tasmania do BBAR coatings. Have not used this service but have used their aluminizing service. Coating was 10/10. I didn't appreciate how good until a subsequent coating which changed my mirrors apparent optical quality from outstanding to mediocre. They have been in the business since the 1940's.
http://www.longmanoptical.com.au/optical-coatings/
Joe