jcboy3 wrote:
It always depends on what you are trying to achieve. Slower exposure times; use an ND. Reduce or kill reflections, use a CPL. Do both, use both.
That said, you will want to put the CPL on first, adjust it for effect, then add the ND filter and adjust exposure. Of course, you want to ensure the CPL filter is in the original position after adding the ND filter. I use a silver Sharpie to place some marks on the outer ring of the CPL. It's easy to see where those marks are after adjustment, and return the filter to that position after adding the ND filter.
Note, I'm not saying to do the marking for this exposure; just having some marks for reference makes it easy to return to approximately the same position.
As an alternative, you could use tape to lock the CPL in place; piece of gaffers tape would do the trick. That's just another thing to fiddle with, which is why I just marked up the filter.
The marks can be easily removed with alcohol or goo-gone, if you decide to sell your filter in the future.
It always depends on what you are trying to achiev... (
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Thanks for the input jcboy3...