A while ago a thread was discussing the minimum distance that the flash can
cut off, and differences between the 2n and 4T. (I presume the 2SP is the
same as the 2n, as John H commented the limitation was due to computing
power and spot metering, memory, etc).
Anyway, I found this in an old Shipman book for the 2n.
T32 Max and Min shooting distances on normal auto or TTL auto with 100 ASA
film
f stop Range in meters
1.2 3.4 - 26
1.4 2.8 - 22
2 2 - 16
2.8 1.4 - 11
4 1 - 8
5.6 0.7 - 5.6
8 0.5 - 4
11 0.36 - 3
16 0.25 - 2
22 0.18 - 1.5
Convert distances to another film speed, multiply by square root(new
speed/100).
e.g min distance at 400 asa f2.8 will be 2.8 meters.
Distances are 1/2 for 1/4 power setting (GN 16).
Apertures are effective apertures, where EA=fstop times (1+magnification)
for lenses where the entry and exit diameter are equal.
Just something I found. Numbers look like they should be different for the
OM-4. They try to get too smart and do themselves in.
Foxy
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