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

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Originally Posted by Curt

it's a barrel process lens with a maximum aperture of f9. It fits in a 50 mm Durst extended cone adapter which I have. Focussing would be dark compared to 5.6 enlarging lenses.

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I use a Repromaster 210mm/9 to enlarge 8x10" negatives. My homemade enlarger (a Durst M800 modification) has a dim light source. Even like this I find it rather easy to focus.
Before this lens I tried a JML 210mm/9, this one gave me trouble focusing. Later, when I got the Repromaster I figured it was because wide open the JML lens was not so good as the Repromaster. Changing lens and trying to focus the same negative was a big surprise. And all I have is a cheap grain focuser.

I own two different types of Repromasters. One is the smaller one, only with f/22 engraved on the aperture ring. The other is bigger with all the apertures engraved (looks more serious, better construction). I use the cheap looking one in the enlarger, with a locking nut it fits the Durst 77mm ring I have for a 150mm/5.6, it is amazing!

Hi,

Can I have some advice as to what carrier to get for a Durst L184 condenser enlarger please ?

I have measured 38cm total width, 33cm inside the tracks on the left and right 9mm wide tracks extending some 19cm into the enlarger. The tracks are around 2mm deep.

What are my options ?

Cheers,

Steve

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Originally Posted by swmcl

Hi,

Can I have some advice as to what carrier to get for a Durst L184 condenser enlarger please ?

I have measured 38cm total width, 33cm inside the tracks on the left and right 9mm wide tracks extending some 19cm into the enlarger. The tracks are around 2mm deep.

What are my options ?

Cheers,

Steve

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Seems like , you may have the Grahalon locating frame which takes the Grane 205 carrier.

Attachment 112790

Though you could also remove the Grahalon locating frame and then the enlarger would accept the more common Nega 205 carrier pictured below:
Attachment 112791
(L184 owners chime in here if you have additional details about these carriers)

The Grahalon was the early version of a pin-registered frame for things like dye transfer printing. It has little relation to ordinary printing. I'm potentially looking for one, if it's in very good shape. Otherwise, I'll make my own.

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Originally Posted by ic-racer

I scanned my L1840 Owner's Manual into a PDF file that I would like to distribute to all Durst owners, or potential owners, that don't have one.

I'd just post it here but the file is just over 6MB. Please PM me and I will send it out.

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Dear sir ,
I'm French and looking for this type of documents to complete my technical understanding of DURST L1840...
Thank you very much for your help.
My mail: fig3@orange.fr
Best regards. / Eduardo (FRANCE)

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Originally Posted by SYSTEM69

Dear sir ,
I'm French and looking for this type of documents to complete my technical understanding of DURST L1840...
Thank you very much for your help.
My mail: fig3@orange.fr
Best regards. / Eduardo (FRANCE)

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The manual is hosted on a French site here: http://manuelsphoto.free.fr/durst_l1...tingmanual.pdf

Since picking up my Durst L184 I have finally a place where I can put it up and start using it. :D Can't wait to try it out and if the 305 enlarger head can actually handle 8x10 inch negatives.

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Originally Posted by Degroto

Since picking up my Durst L184 I have finally a place where I can put it up and start using it. :D Can't wait to try it out and if the 305 enlarger head can actually handle 8x10 inch negatives.

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Is this followup from this 2011 thread? ( http://www.largeformatphotography.in...arger&p=751071 )
If so I congratulate you on your persistence. Have you had a chance to see if the CLS301 turns on?

Hello to all,

Can I ask for a scan of any power supply schematics please? Particularly the 'voltage stabiliser' unit if possible.

I'm seeking to understand how the power is delivered to the lamps on any large scale enlarger really but L138 or L184 circuitry is a good place to start.

I would also appreciate a description of the functionality if you are this way inclined ....

Cheers,

Steve

Quote:

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Originally Posted by swmcl

Hello to all,

Can I ask for a scan of any power supply schematics please? Particularly the 'voltage stabiliser' unit if possible.

I'm seeking to understand how the power is delivered to the lamps on any large scale enlarger really but L138 or L184 circuitry is a good place to start.

I would also appreciate a description of the functionality if you are this way inclined ....

Cheers,

Steve

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The condenser heads for L138 and L184 run the lamps right off the power mains.

The dichroic lamps used in the CLS300 and CLS1840 and CLS2000 heads have regulated power supplies.
The general function of the EST1000N for the CLS1840 head is as follows:
Lamp voltage is sensed by a true RMS converter which outputs to a comparator. The comparator has an adjustable nominal value on the other side. The output of this comparator goes to a couple transistors which set the pulse width for the thyristors that control the lamp. This is a little different from the power supply of the Omega D5500. In that one the comparator voltage difference sets the pulse time using a 555 timing IC.