I'm looking for the right lens and I'm totally at the end of it now. I've got the sigma 18-35mm for my gh4 but also have a gh3 and a zhiyun crane.

I've just sold my 25mm 1.4 because it was too long for the crane, but now I need a new lens for my b cam and crane.

I'd like to get my coverage sorted and not buy anything for a good while.

Here's some considerations:

For my crane a wide lens like the mft 12mm rokinon will still equate to the coverage I get on my sigma. This could work, but won't be any wider than 24 unless I got it for the speedbooster and then I wouldn't be able to use my sigma.

Later I'd like to get something longer than the sigma for close ups.

The lens for the crane needs to be usable for the crane and as a b cam to compliment the sigma for interviews