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Hi, I have had trouble on exposure with Sony A7SII at cloudless daylight videos and I am looking for proper strength ND filter for the purpose. I take film at 25fps 1/50 with SLog3/S-Gamut3.Cine with ISO1800-3600 at f3.5-7.1(preferably) at +1EV and during daylight testing I found out that I had to stretch the aperture up to 20-22 in order to have somewhat decent exposure. I got a Chinese Fotga variable ND filter for free from a friend but the vignetting is noticeable even at lower stops and at higher end it is useless. It appears to me that I would need something in the range of ND10000 to coop with the excess light. On the other hand, someone suggested switching to Cine.4 from SLog3 at daylight shots to bring down the iso, thus balance the light. Should this adversely affect the video quality? I'm not a pro so pardon me if there if I've tripped in a few pits on my way at this matter.
