What can I shoot with a single inon 165 m67? I don't think I'll be doing any super macro. Will there be a significant different without diopter shooting things like nudibranchs and harlequin shrimp? Will it help with focus distance for fish portrait shots? From what I understand the diopter works by making the max focus distance closer. So can I get the same shot of lets say a clown fish from an extra 12 inches away?