My L1840 does not have any sheet metal components. Unless you mean the 3mm thick cosmetic shell that holds the vanity bellows and covers the lifting mechanism?
No asbestos in any of the CLS2000 I have seen.
Dichroic reflectors and lamps are re-manufactured and available. My original reflector is from 1993 and still looks pretty good compared to the new one.
All the Durst electronics I have encountered were modular, discrete and comparatively easy to service.
Attachment 198974
Asbestos pads were in the 2000W CLS 300, a relatively early colorhead. I replaced them with mineral board. The lamps and reflectors bore no resemblance to the CLS 2000 system illustrated in a previous post. I really didn't like either of those heads. My own design is far less expensive to maintain, runs dramatically cooler, and gives better color. But the head is huge and heavy, requiring a custom column too.
Drew - what bulbs are you running in your custom head?
six EVW.
Are they wired as pairs, run off a transformer & with fixed filtration in front of each? I've been contemplating using 3x 82v bulbs in a project as I could probably get away with wiring them in series & running them off the mains - one of those cases where you're very lucky to have the ELH bulb!Originally Posted by Drew Wiley
These are pulsed in, 2ea RGB narrow-band dichroic with a feedback loop. Each set is separated into a V-head design, then mixed in a diffusion chamber. This allows for very efficient cooling, but requires a very heavy bulky head. The chassis is custom too, and massive. The voltage control is related to the complex nature of the system. Hard-wired ELH for YMC subtractive use is a much simpler option, but was not possible in this additive case.
A few tips on focusing when projecting printing close to 1:1. I have a number of images to print on 8x10 paper with a white border; to match a series of images produced in formats smaller than 8x10. This requires a slight reduction.
IMPORTANT:
1) There are NEGATIVE to PAPER distances that will never obtain focus by moving the lens.
2) FOR EVERY LENS to NEGATIVE distance there always will be a focal point that can be found by moving the paper (or head).
The way I do it is to define a LENS to NEGATIVE distance and then obtain focus by moving the enlarger head. If the image is too small or large, I make a small change in the lens stage position. Then re-focus by moving the head.
Why do it this way? When you are close to 1:1, you can easily move the negative and paper too close together into the Zone of Impossible Focus. When in this zone it may confuse and frustrate you to no end!
Why is this? The answer is that as one makes an enlargement smaller and smaller by bringing the head down, after 1:1 is reached, RAISING THE HEAD back up is needed to make the reduction! When in the 'reduction zone' raising the head makes the image smaller and smaller.
For every negative to paper distance that can be focused for an enlargement, a reduction can be focused at the same negative to paper distance.
This is easier to experience with 8x10 enlargers, many smaller enlargers don't have enough bellows draw to actually do this. It is very easy on a Durst 8x10 with its massive bellows draw.
Attachment 199120
Last edited by ic-racer; 8-Jan-2020 at 15:16.
will a CLS 1840 color head fit on a L184 chassis by simply removing the condensors/lamp assembly? or do I need some exotic named adapter?
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