I'm working with zone sieve and zone plate photography. Zone sieve/plate is similar to pinhole photography but it can give a softer, dreamier, look. This is a zone sieve photo I've taken:
Zone sieve/plate does not use a glass lens, but rather a pattern of dots or rings which diffracts the light. You cannot change the focal length of the zone, it is fixed and a characteristic of the physical dimensions of the camera, basically, the distance from the zone to the sensor is the focal length.
I'm trying to shoot wider than the 42mm that my Canon 5dMkII shoots at. Working with the manufacturer, he suggests that I switch to the Sony NEX system, which is the widest system he sells. That has a field of view of 89 degrees.
Looking at this online lens calculator, it seems that the 42mm on my Canon has a FOV of 46 degrees, and that the Sony would have a Full Frame equivalent of 18mm.
Now, 18mm on a Full Frame camera is a pretty sweet spot for landscape photography.
So, my question is, can I trust that lens calculator? I really don't want to spend hundreds of dollars only to find out it doesn't work.