Originally posted by Michael Piziak If the two 58mm ones are polarizers, I wander if connecting them together and turning one of them for more darkness could achieve a desired affect... I seem to have recalled using them to take pics of the moon - maybe I'm wrong as it's been some time...
I have another camera drawer in the basement - I'll check it out tomorrow & see if any ND filters are lurking...
Regards,
Michael
Two circular polarisers will work as a variable ND filter, to a degree, but will (usually?) produce an unwanted "cross" effect at maximum 'darkness'
Two linear polarisers work fine, and if using one of each, fit the circular polariser first. It won't work the other way around, but I never bothered to figure out why.
Trying to adjust two adjustable filters at the same time can be a bit of a juggling act, so prevent the one fitted to the lens from rotating with a bit of tape (or even glue it, if you're feeling brutal!)