Re: Push & N+1 processing

"UC" <uraniumcommittee@xxxxxxxxx> writes:

> Steve:
>
> Here is what you need to know:
>
> Sped is measured at a standard degree of development. This standard
> uses a 'speed point' which is a point on the H&D curve at which the
> curve achieves a defined slope. The particular slope is chosen because
> a minimum CONTRAST is necessary to achieve detail. That slope-point is
> used for all films. You need such a point to be so defined to be able
> to measure film speed, because the point moves a little with changes in
> the degree of development. So, all films are developed the same degree
> for speed testing. Is that clear?

i so much interested in how to determind the slope-point( or speed point) in a
given curve. could you teach me?

>
> Changing the degree of development makes very little actual difference
> in the usable speed (maybe 1/3 stop, despite what you may have heard.
> As development time is increased, contrast increases, and if
> development is prolonged by 100%, contrast becomes very much higher
> than normal. Grain also rapidly increases.


> Just forget about pushing and N+1. It will not increase your speed at
> all.

i believe what you said. i just want to by discussing to know more arround the
point.

.

Relevant Pages

  • Re: Push & N+1 processing
    ... >> Sped is measured at a standard degree of development. ... >> curve achieves a defined slope. ... The particular slope is chosen because ... all films are developed the same degree ...
    (rec.photo.darkroom)
  • Re: Differences in Aptitude
    ... the red curve means that the group of particular math capacity, ... Gauss curve, or some kind of probability distribution ... standard way of presenting experimental data. ... airhead. ...
    (soc.men)
  • Re: Target ph for phenidone
    ... While standard developers were given in ... other developers are compared. ... and will not work on modern films anyway, ... essentially cutting the speeds in half. ...
    (rec.photo.darkroom)
  • Gorilla Testing: Re: Differences in Aptitude
    ... the red curve means that the group of particular math capacity, ... Gauss curve, or some kind of probability distribution ... standard way of presenting experimental data. ...
    (soc.men)
  • Re: sin x / x tends to 1...
    ... from the _standard_ definition of arc length. ... resolve honest onfusion on your part. ... The definition I gave for the length of a curve is ...
    (sci.math)