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Originally Posted by Don Hoey
Leif,
You would be right there. Those lenses probably perform at their best between f4 and f5.6. 
BTW I am reading your macro lens post with interest. Just wondering how limited the dof of a 200 would be compared to the 105 VR. After all you certainly have the sensor resolution to crop. I will check out a review and may well post in that thread.
Don |
Theoretically the DOF is a function of F stop and image magnification alone assuming a fixed value for the size of the circle of confusion. The difference between the various macro/micro lenses is the perspective and the working distance. One of the nice aspects of a long lens is the ability to isolate a subject and create a uniform background.
However, when I compared images of a Bee Orchid using a 60mm macro at F11, and a 75-150 zoom + 3T diopter at 150mm and F11, I am sure the latter had reduced DOF. I suppose it might have been field curvature creating that illusion. Or alternatively the 60mm lens might just have been sharper, creatig the illusion of more DOF. More detailed tests might be worthwhile.
Leif