Originally Posted by
Nodda Duma
I would use them professionally without question, if they had what I needed. They often don’t (as you may guess), so other sources of a wider variety of stock and custom windows/filters are Rainbow Research Optics, Omega Optical, Semrock. I have used them all.
There are others, but more expensive and specialized. Coincidentally was just talking to a supplier about feasibility of a very challenging filter which will likely cost — no joke — $30k+ for a 7/8” diameter filter. Hoping I don’t need it but I probably will.
As a fun side note, when it comes to technically challenging filters, I talk to certain suppliers not because of the company, but because of the individual coating designer who works there. Coating design isn’t something everyone can do. The companies I mention all have good coating designers, and BBAR vis coatings are almost trivial anyways.
-Jason
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