exposure allowance for center filter

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I recently purchased a 72mm SA XL lens and center filter. How much exposure compensation do I use with this filter? Also is there a scale or formula to use to calculate long exposuresto adjust for reciprocity failure? Thanks all, Chet

-- Chet Wright (chetwr@zianet.com), February 01, 1999


Chet, try starting with either 1.5 or 2 stops of compensation. Polaroid will tell you close enough for you to make a couple of further test exposures, to truly nail it down.

-- Ellis Vener (evphoto@insync.net), February 01, 1999.

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