Originally posted by texandrews 25 would probably work
I haven't got one - and I would consider one but not without the ability to take a front mounted Lee filter system. The dynamic range of the 645z is good, but not 30 stop good.
28mm on the 645z actually does it but when I shot 35mm format Nikon I found the 20mm F1.8 did the spot the best. It's the only Nikon wide lens that doesn't have smeary sides. Even the fabled 14-24 is a cheap piece of rubbish with soft sides. I hate soft sides. I expect completely uniform sharpness everywhere on the frame - every part of the composition and picture is chosen to be there so it matters, greatly. The 28-45 is the only wide zoom I've ever had that I could trust in this regard.
Because of the shape of the sensor - I don't think 25mm would actually do it as the 35mm sensor is 3:2 and not 4:3.
It is just a nicer shape of picture - and tbh that was a big motivation to ditch 35mm and move the 645z - the 4:3 shape sensor works better for my tastes now.
I redid this image not long ago and tastes evolve - cropping it 4:3 worked for me. I only wish I had this camera sooner - it really has been by far the best camera system I've ever owned. Combined with DXO PL4 it is unstoppable.