TAB. 3 | ||||||
RELATIVE RESOLVING POWER OF LENSES | ||||||
Theoretical, for perfect lenses, as function of the focal ratio | ||||||
( Reyleigh Criterion for λ=0,56μ ) | ||||||
The absolute res. power depends on the diameter, | ||||||
and is measured in arcseconds | ||||||
FOCAL RATIO | lines / mm | |||||
1 | 1640 | |||||
1,4 | 1170 | |||||
2 | 820 | |||||
2,8 | 580 | |||||
4 | 400 | |||||
5.6 | 290 | |||||
8 | 200 | |||||
11 | 150 | |||||
16 | 100 | |||||
22 | 75 | |||||
32 | 50 | |||||
45 | 35 | |||||
64 | 25 | |||||
90 | 18 | |||||
128 | 12 | |||||
note: | ||||||
for other wavelenghts and other criteria | ||||||
the values may be a little differents | ||||||