Any opinions on the two viewing filters below?
Is it possible to obtain (or make) a viewing filter onto which one could attach another filter (e.g. yellow, green) to compare tonal separation with and without various filters?
Spectra #1 Glass Panchromatic Viewing Filter
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=245949&is=REG&addedTroughType=search
Tiffen Black and White Viewing Filter
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=330726&is=REG&addedTroughType=search
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