It makes me confused and I do not get an affirmative answer yet.
As my knowledge (pls correct me if I am wrong), if I need to push one stop
for film development, I have to plus 1.4X of the time of development, such
as 8.4 mins for push one stop for normal developing time 7 mins at 20ºC
water. If I need to pull down one stop, then I have to reduce 1.4X timing
for development, i.e. 5 mins for normal 7 mins development.
For B&W shooting, if I found the high light area is at zone 8 and I need to
put there to zone 7 and I cannot change the exposure value for shadow area.
That I have to reduce developing time as N-1. I read some local books that
declared the reducing time is 20% of normal developing time, N-2 is less
40% normal developing time. As same factor to calculate N+1 & N+2
developing time so on.
I'm confusing that I have experiences to push & pull one stop by factor
1.4X are OK. Then should I reduce 20% or 40% for N-1 is correct?
Thanks all.
(I'll reply your feedback tomorrow since I have to go to bed because I have
to wake up early tomorrow morning for a promotion interview :p)
Cheers,
Michael
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