Nikon AI-S Micro-NIKKOR 105mm f-2.8 - Manual (Page 22)

Without TTL metering
At close ranges (reproduction ratios greater than
1:10), the amount of light reaching the film de­
creases as the lens-to-film distance increases. When
non-TTL measurement is used in these cases, photo­
graphs will be underexposed unless you have com­
pensated for this decrease. (When the Micro-Nikkor
105mm f/2.8 lens is used with the Nikon/Nikkormat
or Photomic TTL meter, compensation is not neces­
sary since the meter will give accurate readings of the
amount of light reaching the film.)
The tables at the right give the exposure factors
(compensation values) with exposure increases in
f/stops for non-TTL exposure measurement at repro­
duction ratios greater than 1:10.
If you don’t want to increase aperture compensation
more than one full f/stop, use slower shutter speeds.
For example, for a 1:1 reproduction ratio, use 2-
steps slower shutter speed and then open the lens by
2/3 stop, or use 3-steps slower shutter speed and
then stop the lens down by 1/3 stop.