I've decided I may need a CWF for my 65mm f/4.5 Grandagon-N. Based on my experience with the 90mm f/4.5 grandagon -N I am inclined to go with the 0.45 strength of the Heliopan CWF, but now I am looking for users feedback on using that strength CWF on the 65mm f/4.5 Grandagon-N before I whip out the credit card.
So any real world feedback to offer ?
Any reason I should consider the Rodenstock filter dedicated for this lens instead of the Heliopan?
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