sumball said:
Thanks "Student", that means it is depends on the film itself to get a good contrast photo? Not the timing, temp, chemical,...etc?
The neg I developed seems to be a bit dull, is there anyway to improve it?
What reversal kit?
Regarding contrast:
1 Slower films are inherently more contrasty. I am talking about ASA 25. For most films in the region of 100-400, the contrast inherent in a film is not excessive.
2 Contrast in a film depends firstly on the contrast level in the scene. If you take a picture of a monochrome wall, you don't get any contrast at all. On the other hand, if you take a picture of a lighted lamp-post at night, you will get a hell of a contrast!
3 Contrast can also be changed by appropriate filters. Example: pictures of green and red apples. In monochrome, the green and red are almost the same. And the contrast level will be low, and the picture "flat". But if you use a green or a red filter, you increase the contrast by blocking one color and allowing the other to come through.
4 Contrast can also be increased or reduced during development. In the night scene quoted above, where contrast is really excessive, contrast can be severely curtailed by several methods, such as using stand development.
On the other hand, in "flat scenes", contrast can be increased by increasing concentration of developer, temperature, more agitation.Note that increasing contrast by increasing development often leads to increased grain. Increased concentration of developer might not increase grain.
Finally regarding your flat/dull negative, meaning low contrast. If the shadows have good details, the contrast can be increased by one stop by putting your negative in a Kodak Selenium 1:1 with constant agitation for about ten minutes. However if your negative is basically underexposed with weak shadows, I think you should go out and shoot again! There is little that you can do for underexposed negatives!