Thanks for the answers.
I didn't ask my question correctly. I already own a variable ND filter I paid a 180 bucks for. I like it. I like using it. I'm not asking for an explanation on ND filters. The question I'm trying to ask is this:
- I use two cameras in my shoots. Therefore I am reluctant to use variable ND filters as I feel there may be calibration issues between the two cameras.
- Therefore I wanted to buy fixed NDs
- So I was wondering, without breaking the bank, what's a good way to buy fixed NDs. Should I buy ND2, ND4, ND8... and higher. Also, if I buy ones that are not too expensive, then I probably don't want to stack them, because of quality loss, and if so, what should I buy?
If anybody uses them for outside shoots a lot, ie, fixed NDs, please share your experience in the pros and cons of using them, stacking them, etc.