I am in the market for a couple of solid 4x4 ND filters to add to my LEE Filter holder. I tried the 7 and 10 stop HiTech ProStop filters, but found them to produce too much color cast--the 10 produced so much color cast that I could not correct it in post post processing (yes, I shoot RAW) and the 7 was not quite the quality of reproduction to the baseline non-filtered image I was hoping for.
Now, I am about to try Tiffen 4x4 4mm Glass filters. I am limiting my budget to ~$450 for filters, which means I can buy 2 solid ND filters to fill in the hole to the 10 Stop Big Stopper I hope to one day get--I am on a few waiting lists for the LEE Big Stopper, but there is no hope anytime soon.
My question is, should I go with a tradition 4 stop and 6 stop combination, or should I consider a 4 stop and 7 stop combination to give myself 3 stops between each filter.....?