Page 61 of 67 FirstFirst ... 11515960616263 ... LastLast
Results 601 to 610 of 667

Thread: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

  1. #601
    ic-racer's Avatar
    Join Date
    Feb 2007
    Posts
    5,412

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    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.

    Click image for larger version. 

Name:	New Durst Reflector 1.jpg 
Views:	19 
Size:	47.1 KB 
ID:	198970
    Click image for larger version. 

Name:	Old and New durst Reflectors.jpg 
Views:	15 
Size:	52.2 KB 
ID:	198971
    Click image for larger version. 

Name:	Screen Shot 2020-01-03 at 7.45.45 PM.jpg 
Views:	16 
Size:	40.5 KB 
ID:	198972
    Click image for larger version. 

Name:	Colamp 2000 thorn hx27.jpg 
Views:	15 
Size:	103.3 KB 
ID:	198973

  2. #602
    ic-racer's Avatar
    Join Date
    Feb 2007
    Posts
    5,412

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    All the Durst electronics I have encountered were modular, discrete and comparatively easy to service.

    Attachment 198974

  3. #603
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    13,703

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    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.

  4. #604

    Join Date
    Jun 2015
    Location
    Glasgow
    Posts
    613

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    Drew - what bulbs are you running in your custom head?

  5. #605
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    13,703

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    six EVW.

  6. #606

    Join Date
    Jun 2015
    Location
    Glasgow
    Posts
    613

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    Quote Originally Posted by Drew Wiley View Post
    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!

  7. #607
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    13,703

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    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.

  8. #608
    ic-racer's Avatar
    Join Date
    Feb 2007
    Posts
    5,412

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    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.

    Click image for larger version. 

Name:	enlarger1.jpg 
Views:	9 
Size:	30.7 KB 
ID:	199119

  9. #609
    ic-racer's Avatar
    Join Date
    Feb 2007
    Posts
    5,412

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    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

    Click image for larger version. 

Name:	enlarger2.jpg 
Views:	5 
Size:	39.1 KB 
ID:	199128
    Last edited by ic-racer; 8-Jan-2020 at 15:16.

  10. #610

    Join Date
    Sep 2007
    Location
    Milan, Italy
    Posts
    322

    Re: Durst L1840 Enlarger 8x10 10x10--Everything you wanted to know...

    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?

Similar Threads

  1. 8X10 ENLARGER
    By ric YAMA in forum Resources
    Replies: 7
    Last Post: 28-Mar-2011, 12:26
  2. 8x10 Enlarger...HELP please talk me out of it!!
    By ic-racer in forum Darkroom: Equipment
    Replies: 92
    Last Post: 18-Feb-2008, 07:09
  3. cold light head for durst 8x10
    By Herb Cunningham in forum Darkroom: Equipment
    Replies: 5
    Last Post: 12-Sep-2007, 10:05
  4. Durst 184 8x10 enlarger
    By David Michael Bigeleisen in forum Darkroom: Equipment
    Replies: 4
    Last Post: 27-Jul-2007, 06:29
  5. Fotar 8x10 Enlarger used horizontally?
    By Eric_6227 in forum Darkroom: Equipment
    Replies: 6
    Last Post: 22-Apr-2006, 13:02

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •