After someone pointed me to the "depth of field calculator" online I found it invaluable. My wife just bought a new Sigma 70-300 "macro" zoom lens which has a switch that initiates the macro function when zoomed between 200-300mm. It works good for what it is supposed to do, I guess, and the lens in general is far better than I expected for the price.

Is there any way to calculate DOF when in the zoom macro mode? How can she increase DOF? Are there any tricks other than aperture adjustment?

a cheap trick: make sure the "film" plane ie the back of the camera is perpendicular to your subject, a second cheap trick is to increase the contrast between subject and background...........

:?: :?:

After someone pointed me to the "depth of field calculator" online I found it invaluable. My wife just bought a new Sigma 70-300 "macro" zoom lens which has a switch that initiates the macro function when zoomed between 200-300mm. It works good for what it is supposed to do, I guess, and the lens in general is far better than I expected for the price.

Is there any way to calculate DOF when in the zoom macro mode? How can she increase DOF? Are there any tricks other than aperture adjustment?

a cheap trick: make sure the "film" plane ie the back of the camera is perpendicular to your subject, a second cheap trick is to increase the contrast between subject and background...........

:?: :?: