Unscientific, yet......
Sep 2, 2018 23:05:49 #
SuperFly48
Loc: NE ILLINOIS
Found a compact section of moving water locally, so did some testing. Only setting changed was the aperture. These are the unedited results using a D7100 and 18-200 DX VR lens mounted on a tripod. This series has given me something unintended, now I have a pretty good idea where the lens' sharpness starts to fall off (where diffraction starts to show up). Shots are, in order...f/5.6, f/8, f/11, f/16, f/22 and f/32. Typically I shoot this camera/lens combination hand held between f/5.6 and f/11. The focus target in these shots is the leaf cluster in the center. I use a single focus point preset in both the D7100 and in the D850.
Sep 2, 2018 23:56:17 #
Sep 3, 2018 07:41:53 #
The only setting that was changed was the aperture and yet, they all appear to be exposed properly? Might need to recheck your settings -- ISO was moving or your speed was changing.
Sep 3, 2018 08:17:24 #
tradio wrote:
The only setting that was changed was the aperture and yet, they all appear to be exposed properly? Might need to recheck your settings -- ISO was moving or your speed was changing.
Speed definitely changed!
Look at the water.
Sep 3, 2018 09:45:35 #
SuperFly48
Loc: NE ILLINOIS
ISO locked in at 200. Yes, the shutter speed changed, that's what happens when you shoot aperture priority, the camera selects the shutter speed. If you have adequate motion, you should see either freezing of the motion or blurring of the motion, depending on shutter speed. Photography 101. For the shots posted, as follows....f/5.6>1/80, f/8>1/50, f/11>1/20, f/16>1/10, f/22>1/5 and f/32>1/2. Exactly why I took these shots the way I did, to check the change in the water as aperture changed. Diffraction was something I had not thought about checking as I was setting up these shots; noted sharpness as I was reviewing these shots.
Sep 3, 2018 11:16:50 #
wayne barnett
Loc: Grants Pass, Oregon
Good exercise. Something I have been doing to make judgement on longish exposures. A photographer must know his/her apertures.
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