The VCL 4500 gives you complete variable contrast control from grade 0 to grade 5 with 50 settings over entire range without using filters.

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Lowest Operation and Maintenance Cost: 1.Low failure rate, progressive and safe hydraulic system with good control mode.

Low power consumption, hydraulic move down depend on the deadweight to gain energy conservation.

If my Aristo 4500 VCL went on the blink, I would just find a way to get another. Dennis.

My nagging question is this: My current unit is controlled by the closed-loop Zone VI Enlarging Timer.

While I presume the small light intensity sensor fiber optic sensor inside the lamp housing has a color bias, yes in a single lamp design this should make no difference.

There is a difference but you would correct for this while you are doing your test prints.

But what about in a dual-lamp environment, where the light color is - by design - variable Both the single and dual lamp systems are considered variable contrast systems.

The single lamp system just has both the same phosphors in the one lamp.) The use of the fiber optic sensor is a Fred Picker design.

We dont advocate it, but photographers that make very large prints do like using the sensor in commercial applications for a quicker reads of the light intensity.

Its a personal choice whether you want to rely on a sensor or your own skills that youve worked so hard to develop.

In my current setup, that timer does a wonderful job of holding my net exposure times rock solid and repeatable.

Can such a timer be similarly expect to do the same in a two-lamp environment Most enlarger systems will be repeatable, but Ive never seen anything be rock solid.

Over time the lamps age, chemicalsmaterialsenvironment changes -too many variables.

As for the timer, my engineers feel that a timer is a timer is a timer.

If you are comfortable with the timer then continue to use it.

The First Officer then reached out and confidently rang the engine room telegraph over to ALL AHEAD FULL.

Captain Edward Smith to First Officer William Murdoch, on the bridge of the RMS Titanic, 11 April 1912.

I do a lot of custom printing as well as personal printing, meaning I spend seemingly my whole life in the dark in front of my enlarger.

I merely have the head plugged into the wall and into the back of a Beseler audible repeating timer.

I have many times needed to make batches of prints and found it is like using the regular Arista cold light head in that once you get into the batch several prints, they start coming out about 10 too dark so you have to adjust.

But after that you can keep printing the same thing over and over till the cows come in and it is very consistent.

When I am just printing normal (not batches), my habitual technique is to always hit the focus button for maybe 3 seconds just before putting the new paper in the easel and making the print.

When they finally started getting old in my first head I didnt notice anything except that I would make tests and then a print and the print was slightly off from what I expected.

Then I got the new head and low and behold I became a good printer again.

I would have just gotten new tubes for my first head except that the heads had evolved in the meantime and the tubes were different.

If my Aristo 4500 VCL went on the blink, I would just find a way to get another.

Aristo Vcl 4500 Manual