fmw
No longer a newbie, moving up!
- Joined
- Sep 30, 2006
- Messages
- 3,694
- Reaction score
- 493
Good for you.The Nikon AF-S 55-200 mm lens is a consumer grade lens ($350).
It is not designed like, nor is made using the better glass, as Nikon's professional grade lenses.
Which is why Nikon's AF-S 70-200 mm lens is $2100.
I agree that you are using to small a lens aperture and at anything smaller than f/11, like f/22, you are losing focus sharpness because of diffraction.
You need a much better understanding of how to control depth-of-field - DoF:
Understanding Depth of Field in Photography
Lens focal length, point of focus distance, and lens aperture all have to be managed to control DoF.
Lastly. If you are using a tripod VR needs to be turned off.
Nikon VR explained
I shoot all of my tabletop product images at f22. I use f18 occasionally to deal with subjects that are dark and not reflective. My images are and have always been tack sharp. Diffraction is one of those rare phenomena that exist in theory and rarely affect normal photography in practice. Shooting at f22 allows me to insure that everything is sharp front to back without thinking about it or worrying about it. Even f32 doesn't cause me problems with diffraction. I hand hold the camera and allow the strobes to handle the exposure time which is normally 1/several thousandths of a second. I use a 60mm macro lens on a DX camera body and auto focus. In rare cases I use a wide angle zoom when the subject requires it.
If nothing is sharp in your images, then there is an equipment problem because you should get at least one plane in focus if you use your auto focus. Since you use a tripod, the problem is not likely to be motion blur. I tend to think that the issue is depth of field. That means that the plane of focus is sharp but portions of the image further from or nearer than the plane of focus are soft. You fix that by stopping down, using a shorter lens or increasing the distance from the lens to the subject. Your issue may be as simple as focusing a little deeper into the subject. Hard for me to guess without watching what you do.
I don't know which lens you are using but, if it is long zoom, I would consider investing in a macro lens.
As noted in the link regarding diffraction provided in a post before mine, how much diffraction a lens aperture/camera image sensor (pixel size) combination used varies the amount of diffraction.
No doubt. But after half a century of photography using every format from 4X5 on down and using apertures from f64 on down I have never encountered diffraction as a problem. I don't doubt that I could set up an experiment to point it out but, for the most part, it can be ignored.