Thanks for your comment, Ken.
I understood the rule of Expose For the Shadows, Develop for the
Highlights. As my knowledge, I determine the area of zone 3 and meter the
highlight area is zone 8. Then I have to develop the film with N-1 to
reduce highlights to zone 7. Am I correct?
I'm confusing that how many reducing time is correct. I use Kodak HC110
developer and make different dilution for different contrast of film. I'd
control the water temperature in 20ºC & 7 mins developing time. Normally
I'll develop film a bit thick (over) for easier printing in darkroom.
Cheers,
Michael
On 9 April 2015 at 23:50, Ken Norton <ken@xxxxxxxxxxx> wrote:
> Michael,
>
> I wouldn't work the development times like that, as there are other issues
> involved and it varies with every developer. I strictly use the tables for
> development for my chosen developer. But I almost exclusively use Ilfotec
> DD-X.
>
> The rule of thumb for push/pull/zone exposure/processing is to Expose For
> the Shadows, Develop for the Highlights.
>
> Determine you minimum exposure to get Zone I. Set the camera for that. Spot
> meter your highlights and determine how many stops you need to pull them up
> or down. That's your N+ or N- development. But you already know that.
>
> As I use DD-X as my primary developer, it's more of a push/pull developer
> than a contrast control developer, so I don't do zone-system development
> with it, but you certainly can with D76. For that, there are many published
> tables.
>
> Ken Norton
>
>
> On Thu, Apr 9, 2015 at 10:14 AM, Michael Wong <mialop.wong@xxxxxxxxx>
> wrote:
>
> > 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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> >
> >
>
>
> --
> Ken Norton
> ken@xxxxxxxxxxx
> http://www.zone-10.com
> --
> _________________________________________________________________
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>
>
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