Lamp upgrade for Durst 138S enlarger

Linda

A
Linda

  • 1
  • 1
  • 44
I want to join the Circus

A
I want to join the Circus

  • 1
  • 1
  • 65
Lith on Bromide

A
Lith on Bromide

  • 0
  • 0
  • 83
Stone monoliths

Stone monoliths

  • 3
  • 1
  • 146
Bottoms Up

A
Bottoms Up

  • 3
  • 0
  • 89

Recent Classifieds

Forum statistics

Threads
180,635
Messages
2,493,583
Members
95,122
Latest member
pulsa333
Recent bookmarks
0

Donald Miller

Member
Joined
Dec 21, 2002
Messages
6,233
Shooter
Large Format
I have been considering the lamp upgrade that was advertised and offered by Durst Pro/Jensen Optical at one time. Has anyone here converted their enlarger to this new 1200 watt lamp? If so what have your experiences been? Aside from that is there another way of converting a 138S to a point light source? Will the current condensors work with a point light source? What is the current URL for Jensen Optical/Durst Pro? I don't seem to be able to locate it. Thanks for your help.
 

Clueless

Member
Joined
Dec 6, 2004
Messages
168
Shooter
Multi Format
What are your intended uses of a Point Light Source?
 

Peter Schrager

Subscriber
Joined
Jul 19, 2004
Messages
3,780
Location
fairfield co
Shooter
Large Format
Durst

I know that aristo has a lamp that will fit the 138 which is a 5x7 enlarger. Maybe even the VCL lamp they make will fit. Check with them. I have a V-54 lamp and it's really works well with VC paper.
Peter
 

Jon King

Member
Joined
Sep 20, 2002
Messages
361
Location
New Hampshir
Shooter
Medium Format
Is this the lamp you were looking at?

Dead Link Removed
 

wfwhitaker

Member
Joined
Feb 6, 2004
Messages
565
Location
Lobsta
Shooter
Multi Format
Jensen Optical is at http://jensen-optical.com/. They still offer a "lamp kit" for the 138S albeit with a price tag in excess of $800. Their web site is all but unnavigable; good luck trying to find it.

The bulb which Durst specifies for the point source is the "PULAMP". It is a 12-volt bulb and requires the proper power supply. According to a Jensen representative I spoke with just this week, they do stock the PULAMP bulb at $75 apiece. I'm investigating other bulb possibilities.

The correct condensers for the point source are the coated condensers which are designated by a "T" suffix. A coated mirror was also supplied with enlargers intended for point source use. I wonder how important the coated condensers are. It would be interesting to compare.

Also see (there was a url link here which no longer exists)
 

Bob Carnie

Subscriber
Joined
Apr 18, 2004
Messages
7,734
Location
toronto
Shooter
Med. Format RF
Don

I am considering this upgrade as well for my enlarger, If you do go ahead could you post your thoughts on the differences and advantages that you notice, I would very interested in your experience
 
OP
OP

Donald Miller

Member
Joined
Dec 21, 2002
Messages
6,233
Shooter
Large Format
peters said:
I know that aristo has a lamp that will fit the 138 which is a 5x7 enlarger. Maybe even the VCL lamp they make will fit. Check with them. I have a V-54 lamp and it's really works well with VC paper.
Peter

I am not at all interested in a diffusion light source for an enlarger. Having printed with the Durst condensors, I can see a definite improvement in sharpness and local contrast with the opal lamp/condensors.
 
OP
OP

Donald Miller

Member
Joined
Dec 21, 2002
Messages
6,233
Shooter
Large Format
wfwhitaker said:
Jensen Optical is at http://jensen-optical.com/. They still offer a "lamp kit" for the 138S albeit with a price tag in excess of $800. Their web site is all but unnavigable; good luck trying to find it.

The bulb which Durst specifies for the point source is the "PULAMP". It is a 12-volt bulb and requires the proper power supply. According to a Jensen representative I spoke with just this week, they do stock the PULAMP bulb at $75 apiece. I'm investigating other bulb possibilities.

The correct condensers for the point source are the coated condensers which are designated by a "T" suffix. A coated mirror was also supplied with enlargers intended for point source use. I wonder how important the coated condensers are. It would be interesting to compare.

Also see (there was a url link here which no longer exists)

Thanks for the link to their site. I will need to check with Jens about the condensor and mirror considerations.
 
OP
OP

Donald Miller

Member
Joined
Dec 21, 2002
Messages
6,233
Shooter
Large Format
Bob Carnie said:
Don

I am considering this upgrade as well for my enlarger, If you do go ahead could you post your thoughts on the differences and advantages that you notice, I would very interested in your experience

Bob, If I decide to pursue this then I will keep you informed.
 

Mark Noble

Member
Joined
Nov 6, 2004
Messages
4
Location
Olympia, WA
Shooter
8x10 Format
For your protection I would only purchase by COD or credit card. What They say is in stock ain't necessarily so -- Jens is a nice guy but over a year and $9K Later.....still have yet to see the goods.
 

Clueless

Member
Joined
Dec 6, 2004
Messages
168
Shooter
Multi Format
Found and copied article on DIY point light source from "Darkroom" by Rudy Bender (some time back) Don't have issue, date, Etc., just the clipped article of 2 pages.
 

Bob F.

Member
Joined
Oct 4, 2004
Messages
3,978
Location
London
Shooter
Multi Format
Mark Noble said:
For your protection I would only purchase by COD or credit card. What They say is in stock ain't necessarily so -- Jens is a nice guy but over a year and $9K Later.....still have yet to see the goods.
Anyone who is interested can follow the details of Mr Noble's remark, and Jensen Optical's response on this thread: http://largeformatphotography.info/lfforum/topic/498016.html. He pops up about 3/4 of the way down. Frankly however, I do not recommend it...

Bob.
 

Thilo Schmid

Member
Joined
Sep 10, 2002
Messages
352
Location
France
Shooter
Multi Format
Don,

this sounds interesting, but I wonder if such a powerful light source is usable for "normal" print sizes without a shutter. This has always been a problem with my CLS300 (2x1000W), besides the heat radiation during summertime. Do you rally think, the 138 Condenser Head is dim or do you consider the light characteristics as "upgrade"?
 

Claire Senft

Member
Joined
Dec 7, 2004
Messages
3,239
Location
Milwaukee, W
Shooter
35mm
coated condensers

I believe that coated condensers would give you higher contrast with less flare. I believe that going to the point light source w/o condensers would still yield a print that would be very close to the coated condensers.

If the Pulam with point light sorce transformer is bought new it will be even more expensive.---see B&H. However the 1200watt unit will probably require an exhaust fan due to heat.

Coated condensers are hard to find as is the varipoint on Ebay.

I have an S45...similar to the Li38. I have both an aristo cold light head and a regular consenser setup. Mighty nice enlargers.

Going to a point light source with a particular paper grade or filter number for an aim point will require a somewhat lower film speed and reduced development.

Of course cleanliness requirement will be even more ridgid. Tiny scratches that do not show with regular condensers will show with the point light source.

Good luck.
 

Clueless

Member
Joined
Dec 6, 2004
Messages
168
Shooter
Multi Format
Two articles, 4 pages, of "Darkroom Photography" ('83 and '82) about Rudy Bender's experiences with PLS and Durst and a DIY version have been sent but were rejected, bounced etc. I asked about your intentions because it seems to me it is an "extreme" solution for "extreme" negatives. Moreover, the side effects tend to be glaring if the negative isn't rather tailored to the source.
 
Photrio.com contains affiliate links to products. We may receive a commission for purchases made through these links.
To read our full affiliate disclosure statement please click Here.

PHOTRIO PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Ilford ADOX Freestyle Photographic Stearman Press Weldon Color Lab
Top Bottom