I have a Heliopan 77mm Variable Nd Filter in excellent condition, the best variable ND filter available period, with no color shift or resolution loss as you increase ND. It is optimized for digital as well as film. Phil Bloom did a great review of this filter on his blog: http://philipbloom.net/2011/06/04/the-best-variable-nd-filter-i-have-used/ Purchased last month and still have original packaging case. It's smooth adjustable ring allows 1 to 6.6 stops of ND filtering. This filter has been kept in a soft microfiber pouch ever since purchase. Asking $420+shipping. Send all inquiries to mrak1979@yahoo.com. Thx.
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