| Lieberkuhn dia |
Lens dia
|
f
|
Notes
|
|
|
A
|
2.8cm
|
9mm
|
10mm
|
|
|
B
|
3.0
|
11
|
20
|
|
|
C
|
2.3
|
~2
|
1
|
|
|
D
|
2.3
|
~1.5
|
<1
|
Lieberkuhn very damaged
|
|
"1"
|
NA
|
1
|
<1
|
With brass cover |
|
"2"
|
NA
|
<1
|
<1
|
With brass cover
|
Example Lieberkuhn objective (A above)
Example non-Lieberkuhn objective ("2")