Anyone knows the cost of ordering your select spectrum filter ?

[Mustafa Umut Sarac]

I know Schott and some remote sensing filter making companies coat your glass with special ordered spectrum layers or chemicals .

I am thinking to do it after film sensivity added to the calculation and after matching with the sensivity curves - I posted it - of autochrome .

Anyone knows the cost single R G or B ordered ?

Thank you ,

Umut