| Mask 1 | Mask 2 | |
| Type | Symmetric | Symmetric |
| Central obstruction | 30% | No obstruction |
IWA*( ) |
7 | 3 |
| OWA*() |
16 | 30 |
| Contrast | 10-7 | 10-7 |
| Throughput**(%) | 16 | 24 |
* In the experiment the wavelength was 
= 632.8 nm,
and
the diameter of the entrance pupil was D = 2 mm
(the binary mask is inscribed to this pupil).
** Ratio of the transmissive area of the mask to the whole area
for an assumed entrance pupil diameter of 2 mm.
|