I'm looking forward to the arrival of a Nikon 65mm f4 for use with 4X5 transparency film. The Heliopan 67mm 3x center filter is the one most often recommended for this lens but they are very expensive. I'd like to avoid juggling a center filter with a warming filter and graduated ND by finding a digital solution. Besides the lens vignetting filter in Adobe Camera Raw (with amount and midpoint adjustments), what software options are out there for correcting fall off? Does software correction compare favorably with the results obtained with a center filter? Thanks for your input.
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