Usagi
Member
Yes, again question that has haunted me a long time.
Usually with the normal developing tank you got the lid and the stick that should be used for rotating the reel (spiral) in during the agitation.
Most sources that I have read says that the stick should throw away immediately as it's do only harm to your firlms. The rotatin agitation with stick is bad. The film's speed at the outer edge of spiral/reel is faster than inner. So the the deeper the film is in the spiral, the less it develops.
1. Point for question: Is that really that straightforward? Have anyone done or access to test and results where two identical films are exposed with middle gray and another developed with using agitation and another with only using rotary stick.
Is there remarkable difference in the density of the film frames that has been on the outer area of the spiral?
2. question follows directly: If the result was what most would expect, the edge area of film was more dense. Then how could rotary film processer be so popular and famous of the even quality that they gave.
What is changed when compared to table top tank where film is rotated by rotary stick?
- outer edge has faster flow in the chemistry, same for both
- inner parts has slower flow... Again same for both
* In the rotary stick rotation, the reel/spiral is always under the chemistry. In the rotary processor, the film breaks the surface of chemical twice. First when rising up from the chemical and second time when diving to the chemical again.
The last point is the only difference I can Imagine.
3. The lifting method. This method has said to be best for roll films. It has to done in complete darkness and the lid of the tank is left open.
First dump developer to the tank, then lift reel(s) to the tank using special rod and then do agitation by lifting reels form the tank, rotating them something like 60 degrees and raise them again back to the tank.
Much more troublesome than more common shaking/inverting agitation but results should be really good. Or is it? Being bit sceptic here.
I know that there's lot of other members on the board that has done tons of tests but does anyone tested this? rotary agitation (jobo stylish), normal inversion agiation and then rotary agitation by using rotary stick/rod.
Which will gave the most even result and why? Is that repeadable?
The differences should be clear with 120 film if they exists. If there's no differences then at least some of the thousands 'hard to kill' myth that lies beneath the thin surface of the B&W developing world is busted.
Usually with the normal developing tank you got the lid and the stick that should be used for rotating the reel (spiral) in during the agitation.
Most sources that I have read says that the stick should throw away immediately as it's do only harm to your firlms. The rotatin agitation with stick is bad. The film's speed at the outer edge of spiral/reel is faster than inner. So the the deeper the film is in the spiral, the less it develops.
1. Point for question: Is that really that straightforward? Have anyone done or access to test and results where two identical films are exposed with middle gray and another developed with using agitation and another with only using rotary stick.
Is there remarkable difference in the density of the film frames that has been on the outer area of the spiral?
2. question follows directly: If the result was what most would expect, the edge area of film was more dense. Then how could rotary film processer be so popular and famous of the even quality that they gave.
What is changed when compared to table top tank where film is rotated by rotary stick?
- outer edge has faster flow in the chemistry, same for both
- inner parts has slower flow... Again same for both
* In the rotary stick rotation, the reel/spiral is always under the chemistry. In the rotary processor, the film breaks the surface of chemical twice. First when rising up from the chemical and second time when diving to the chemical again.
The last point is the only difference I can Imagine.
3. The lifting method. This method has said to be best for roll films. It has to done in complete darkness and the lid of the tank is left open.
First dump developer to the tank, then lift reel(s) to the tank using special rod and then do agitation by lifting reels form the tank, rotating them something like 60 degrees and raise them again back to the tank.
Much more troublesome than more common shaking/inverting agitation but results should be really good. Or is it? Being bit sceptic here.
I know that there's lot of other members on the board that has done tons of tests but does anyone tested this? rotary agitation (jobo stylish), normal inversion agiation and then rotary agitation by using rotary stick/rod.
Which will gave the most even result and why? Is that repeadable?
The differences should be clear with 120 film if they exists. If there's no differences then at least some of the thousands 'hard to kill' myth that lies beneath the thin surface of the B&W developing world is busted.