to get feeling about how maps may look like at different resolutions do the following learning exercise: download a structure from PDB and compute Fcalc maps at different resolutions:phenix.fmodel model.pdb high_res=1phenix.fmodel model.pdb high_res=2phenix.fmodel model.pdb high_res=3phenix.fmodel model.pdb high_res=4phenix.fmodel model.pdb high_res=5...phenix.fmodel model.pdb high_res=10phenix.fmodel model.pdb high_res=20then load them in Coot and you will get your answer.
1H1K, 1PNS, 1PNX, 1VCR,1ZBB, 2QIJ, 2QZV, 3LVH, 3PCQ
I'd suggest downloading a few of these and looking at the maps.
-Nat