In advanced mirrorless, I thing the two choices are Sony or Fuji. I think the Fuji has it for customer service and build quality, but Sony has more glass available (but not necessarily better glass). The other idea is to wait to see what Nikon puts out in mirrorless. But O don't think you would regret getting the Fuji xt-20. I have the xt-2 and the 20 is about 85% identical. The lenses are beautiful, sharp and mechanically very smooth operating. The jpegs are gorgeous right from the camera, and all the controls are on the body and operation requires a minimum of menu diving.

Ladies and Gents,
I have a small collection of 2 and 3 stop Lee, Hoya and Hi Tech ND filters - all graduated. When I tried some long exposures there was a strong magenta tint which, I have learned is most likely from the filters. Since I want to get into long exposures for interesting applications as well as the more common uses, I thought I would bite the bullet and get 3, 6 and 10 stop solid filters that are not at the low end and that will not have any color cast. I know that there are a number of manufacturers and I will have to price compare. One question is whether I should get screw on filters or use a filter holder with square or rectangular plates. I will need a filter thread of 77mm and have the step down (up?) filter rings. Before I spend a bunch is there any advice to help me spend wisely?
Thank you,
Photodoc16