add-lens 2x
add-lens 2x + 4x
The special focus length has some advantages for macro photography because the distance between lens and CCD is shorter. In this case, the ray's dispersion makes depth of field as wider as appears by classical lens. Here you can find some data of depths of field (in mm) of Dimage 7. There are also some DOFs measured by using additional lenses.
| DOF (mm) at aperture | ||||||||
|
Focus (mm) |
Focus set to |
9,5 |
8,0 |
5,6 |
3,5 |
Distance to subject (cm) |
Visible area |
Magnification (ref to 35 mm) |
| 200 | 120 cm | 150 | 90 | 60 | 40 | 100 cm | 20 cm | 0,17:1 |
| 200 | 60 cm | 70 | 50 | 35 | 20 | 50 cm | 11 cm | 0,32:1 |
| 200 macro | 60 cm | 65 | 50 | 35 | 20 | 50 cm | 11 cm | 0,32:1 |
| 200 macro | 25 cm | 10 | 7 | 5 | 3 | 13 cm | 5 cm | 0,7:1 |
| 200 macro + 2x | 60 cm | 10 | 8 | 6 | 4 | 25 cm | 5,8 cm | 0,6:1 |
| 200 macro + 2x | 25 cm | 8 | 6 | 4 | 2 | 10 cm | 4 cm | 0,87:1 |
| 200 macro + 6x | 60 cm | 4 | 3 | 2 | 1 | 13 cm | 2,8 cm | 1,25:1 |
| 200 macro + 6x | 25 cm | 5 | 4 | 3 | 2 | 8 cm | 2,8 cm | 1,25:1 |
| 200 macro + 50 mm | 60 cm | 1 | 0,8 | 0,5 | 0,3 | 3 cm | 1,2 cm | 2,92:1 |
| 200 macro + 50 mm | 25 cm | 1,5 | 1,3 | 1 | 0,6 | 2 cm | 1,9 cm | 1,84:1 |
To compare, some depths of field data of my old Tokina's 70 mm macro lens and extension tube at aperture 16 are here:
|
Focus (mm) |
DOF |
Distance to subject (cm) |
Visible field |
Magnification |
| 70 macro + 50 mm | 2,5 mm | 3 cm | 3 cm | 1,17:1 |
| 70 macro + 60 mm tube | 1,5 mm | 4 cm | 2 cm | 2:1 |
| 70 macro + 60 +68 mm tube | 1 mm | 3 cm | 1 cm | 3:1 |
Depth of field with add-lens samples:
| macro 200 mm
|
macro 200 mm,
add-lens 2x
|
macro 200 mm,
add-lens 2x + 4x
|