Hi there
if I can, I found several minor bugs+suggestions there:
1) Camera shutter speed, it´s limited to 1/999, it´s a very low range, use 1/8000 instead (for instance, or more, depeneds on a camera, my Pentax k 5II uses the range I wote above)
2) Add a trigger here, that will "fix" the value in common steps such as 1/1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, /250, 1/500 and so on.
3) f-stop value - use the same as above, let´s allow a common settings there please so trigger and so on
2+3) or, link the setup with C4D camea settings, it´s propably possible by Xpresso, but be "honest" as possible (for an user)
4) is possible to use a CINEMA 4D Sky object fo the Sun settings position/angle/color contol? It´s the best and most often used way. Simply, it´s very easy to animate it, set it and so on... (and has pretty nice and predictable preview as well)
5) Remove the Corona material from the "shaders" menu please. use the root "Create" menu instead.
6) there are some phong shading issues/bugs, it is not (sometimes) analyzed well
if I can, here is the example, I used Corona and Indigo, indigo works correctly, Corona not.