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When you develop film, the chemical that's touching the film wears out after a while--the real term is "reaches exhaustion," but that just means it wore out. When you agitate the tank, the worn-out developer is exchanged for fresh. Over-agitation can cause development streaking because the solution travels through the sprocket holes too much. Too little agitation can result in lowered contrast and un-even development (mottling).
Comment on overagitation
You "overagitate" by moving the tank too rapidly. You can overagitate if you turn the tank over once every five minutes, if you flip it really, really hard when you do. There are rotary processor systems such as Jobo that continuously agitate the tank, but it's a very slow, gentle agitation so you don't get streaks around your sprocket holes. I also remember being into H&W Control film, which was a film-developer system that promised nearly grainless, super long tonal scale images. It actually did it too, if you didn't mind that the film was ISO 25. You had to continuously agitate it. Wouldn't work any other way, or so the instruction sheet said. I figured if they went to the good time and trouble to tell you to do it they had a reason, so I always did it and it worked like the book said it would.
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What is the best way to dry processed film manually?
In my experience, liquids are always needed in the processing of films. If you consider printing part of the processing, then the negatives (the film after developing) are typically air dried before printing. There would be no reason to want to keep negatives permanently wet. Trying to manually rush the drying of negatives would inevitably lead to occasional damage.
Why does the water return to the reserve tank while still on?
Hot water (engine coolant) expands and pushes its way back into the coolant reservoir.
Advantage of live tank CT over dead tank CT?
Following are the advantages of Live Tank over dead Tank : a) The Primary conductor is short than (in live tank CT) than the Dead tank CT which gives better Rigidity and gives high short circuit current withstanding capability and reliability. b) Primary winding is uniformly distributed around Core, Hence CT is truly low reactance type, which has inherent better transient performance. c) Due to shorter length and the tank being live the major insulation is not over the high current carrying primary, which is the main source of heat (as in the case of Dead tank type design.) the insulation does not get heated up while dissipating the heat generated. This facilitates much superior thermal stability of insulation and longer life.
Why does the gas tank splash back when filling?
The tank is not venting properly.
What tools and equipment does a photographer use?
At the very least, a camera and the time and place to use it. Otherwise, if you're working with film, some items might include:FilmFilm cameraTripodDifferent lensesFilm developing tank (plus necessary chemicals for developing the film)Access to a darkroom with a projector, filters, and necessary chemicalsPhoto paper (Like Ilford)Negative sleevesIf you're working with a digital camera, some items might include:Digital cameraTripodPhoto editing softwareOther than this, you may also want to use lighting equipment and backdrop sheets, amongst things like props and sets (for shoots that need them).
