Now *this* was interesting … I had promised to devise a test to determine if Fuji added two ND filters for the 3-level aperture in the F300 or if perhaps they had mercy on us and added a real aperture somewhere in there.
So I set up the tripod(s) about 5 feet from my lovely Canon Lens coffee cup (thanks Nick) with a door knob about 6 to 8 feet behind it. This ration of 5:8 in subject / background distance at close quarters will give pretty nice blur at 270mm, even for these small sensors.
As a reference for DOF, I also shot the D700 in this test with the 70-300VR on tripod but from an extra foot back as I was unable to get focus that close (the EXR cams were in macro mode.)
Now … sensor size differences predict a pretty massive difference in depth of field. The crop factor for this 1/2” sensor with this lens is 5.4, which means that f/5.6 should have DOF equivalent to about f/30 on the full frame sensor. (5.4 * 5.6 = 30)
So here is how the D700 shot the scene at f/5.6.
And here is the F300
To verify that the F300 has not changed from the F70, here it is
So, without further ado, I show you the complete set of crops. And yes, you absolutely *must* click through, lest someone think I expect you to judge from the 400px blog version :-)
- The F300 has a real aperture at f/16!!! DOF increases.
- The D700 retains smoother bokeh past the point at which I expected it to match. But it gets close at f/40, which is close enough to the calculations when you consider how approximate the formula is.
- There is vignetting wide open on the F70 and F80, this has been known for a year and is confirmed in this test.
- There is *no vignetting* wide open on the F300 at 270mm. Well done Fuji!