[Brightcolours]

I am seriously considering moving back to APS-C.

After getting 750D and EFS 10-18 I am wondering what am I doing with my full frame gear.

They are bulky and heavy, expensive with marginal advantage.

For landscape the DOF of APS-c is quite handy.

Only drawback is portraits.

So I am considering switching back to APS-C with 8 mm fisheye 10-18 17-55 f2.8 and the kit 18-55 when weight matters 70-300 50f1.4 and 1.8 100mm macro and getting soon tamron 150-600 (would be exchanging it to Canon 24-105) I think I am well equipped. Will keep 5D body however it is quite nice for portraits along with 100 macro so what do you think?

 

The only reason for FF (except for the high resolution FF cameras) is shallow DOF ability. When you use equivalent settings, APS-C has the exact same DOF as FF, so the DOF for landscapes is the same. Unless you use crazy small apertures which produce a lot of diffraction softening, of course.

 

Only you can decide if you need FF for shallow DOF (portraits as you mention). On the other hand, you will not get a lot of money for a 5D now, so why not just keep it for when you want to take advantage of the extra shallow DOF abilities? 

 

For macro, APS-C has the advantage that 1:1 macro photos result in larger magnifications in print.