Using a 4/3 senor will also give you some other effects that are not so welcome like a larger DOF which will make it harder to isolate the subject from its background, as the sensor is smaller it has to use smaller light receptors that are squashed together closer on the sensor which will produce more noise and less dynamic range than a full frame sensor. If smaller sensors were so good we would all be running around with point & shoot or bridge camera's with interchangeable lens's.
My take on this is that people shouldn't be relying on extra focal length at the expense of learning field craft. In 99.9% of situations if you know what your doing, you can get twice as close to the subject you're shooting anyway.
So for example, light isn't great in autumn, so high ISO comes into play. I take my D3+300mm ( using the D3 as a FF example ) out to shoot a few squirrels ( Pictures, not shoot dead... lol ) and another tog takes an oly and his 300mm. ( to use as a 4/3 example )
Now say for arguments sake, I know loads about squirrels, have learnt to read the signals in their behaviour, and can place myself half way distance wise between the oly tog and the squirrel. ( Not blocking him, we both have an un-obstructive view )
Who will get the better image?
If we're talking wildlife photography, I think generally people have had it easy with cropped sensors, and now rely on effective focal length more than knowing the subjects.
Because some people think that it's more important to be able to take a photo from half a mile away than to learn about the subject they're shooting and get proper photos...
Ooops did I type that out loud
1000mm! Just get closer!
Sometimes, I like to go hiking, and shoot things, such as grizzlies, wolves, have shot lions. I like to not do that with a macro...;
Sometimes I like to go astronauting... my ZZ-1 Super-Raptor blasts me on a hyperbolic trajectory into a geocentric orbit, and only when stable do I unpack my egg sandwiches and Olympus E-1 with 300mm attached to shoot frozen rivers in Greenland... I do not do that with a macro...
Sometimes I like to go astronauting... my ZZ-1 Super-Raptor blasts me on a hyperbolic trajectory into a geocentric orbit, and only when stable do I unpack my egg sandwiches and Olympus E-1 with 300mm attached to shoot frozen rivers in Greenland... I do not do that with a macro...
except that mine are serious examples of things that I have photographed, and I am not the only person to photograph these types of animals...I, like others, would admit that the D3 is a better camera. For what I want, and what I can AFFORD, my E3 is a GREAT body. And there are situations when I am glad I have it, wouldn't trade it for anything else.