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themoleman342
Joined: 21 Oct 2007 Posts: 2190 Location: East Coast (CT), U.S.A.
Expire: 2013-01-24
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Posted: Sat Sep 27, 2014 12:42 pm Post subject: Making a very quick & cheap diffusion enlarger? |
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themoleman342 wrote:
I have an extra Beseler 67 enlarger. The lamphouse is completely empty aside from the bulb. Condensers were sold separately so there's nothing of value inside. An empty lamphouse + stand is pretty much worthless. Full set-ups don't even sell for that much.
Is there a way to convert it into a diffusion enlarger? I'm thinking painting the inside white and making some ground-glass to put in the bottom. Easily less than $15. Even illumination may be difficult to achieve so are there other, better ways to go about this?
I already have all the additional beseler accessories that would be needed. Filters, heat-absorbing glass, negative carriers, lenses, lens boards. That's some of the reason I thought it would be fun to experiment instead of just buying a diffusion head. It's also that it's of no use as it sits. If the conversion makes it somewhat useful, even if the results are not technically perfect, I consider that a win.
Thoughts or advise welcome!
Thanks everyone!
~Marc |
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PWhite214
Joined: 19 Apr 2014 Posts: 230 Location: Houston, Texas
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Posted: Sun Oct 05, 2014 6:35 pm Post subject: |
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PWhite214 wrote:
While I don't know much about it, sounds like a good idea to me. I wonder is crinkled aluminium foil might bounce the light around better than white paint.
Phil |
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philslizzy
Joined: 07 Aug 2012 Posts: 4747 Location: Cheshire, England
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Posted: Sun Oct 05, 2014 11:04 pm Post subject: |
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philslizzy wrote:
PWhite214 wrote: |
While I don't know much about it, sounds like a good idea to me. I wonder is crinkled aluminium foil might bounce the light around better than white paint.
Phil |
That can cause uneven lighting. I suggest a bunch of LED's, you can get 160 LED lamps from ebay for about £15. Diffuse it with a piece of translucent plastic, 2 layers of white plastic milk bottle will do the job.
EDIT: put as much distance as you can between the leds and the plastic for better diffusion. Dont use apertures smaller than f8 when enlarging because depth of focus may cause the texture of the plastic to show through. Translucent perspex (plexiglass) would be ideal.
Search this number on ebay for the type of light i reccomend: 121252158439
The forum won't allow my link. Its been a PITA this last couple of days. _________________ Hero in the 'messin-with-cameras-for-the-hell-of-it department'. Official. |
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themoleman342
Joined: 21 Oct 2007 Posts: 2190 Location: East Coast (CT), U.S.A.
Expire: 2013-01-24
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Posted: Sat Oct 11, 2014 12:07 pm Post subject: |
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themoleman342 wrote:
Ah, sorry I didn't realize anyone had commented on this.
I like the idea of the LED conversion. Maybe if I was starting from scratch but retrofitting it into the top of the box would probably be difficult. Plus it's battery powered so I can't link it to the darkroom timer.
I have an old Federal enlarger that's a diffusion system. I hated working with it because of the carrier. I know it has two pieces of ground-glass. The top one looks sandblasted in the center only. Maybe I'll take a few notes from that. |
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philslizzy
Joined: 07 Aug 2012 Posts: 4747 Location: Cheshire, England
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Posted: Sat Oct 11, 2014 9:14 pm Post subject: |
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philslizzy wrote:
themoleman342 wrote: |
Ah, sorry I didn't realize anyone had commented on this.
I like the idea of the LED conversion. Maybe if I was starting from scratch but retrofitting it into the top of the box would probably be difficult. Plus it's battery powered so I can't link it to the darkroom timer.
I have an old Federal enlarger that's a diffusion system. I hated working with it because of the carrier. I know it has two pieces of ground-glass. The top one looks sandblasted in the center only. Maybe I'll take a few notes from that. |
I never used an enlarger timer. I can count manually using a seconds timer _________________ Hero in the 'messin-with-cameras-for-the-hell-of-it department'. Official. |
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adson3492
Joined: 13 Nov 2014 Posts: 1
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Posted: Thu Nov 13, 2014 12:57 pm Post subject: |
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adson3492 wrote:
Is there such a thing? _________________ Are you worried about 200-001 exam CISCO |
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themoleman342
Joined: 21 Oct 2007 Posts: 2190 Location: East Coast (CT), U.S.A.
Expire: 2013-01-24
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Posted: Fri Nov 14, 2014 10:32 am Post subject: |
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themoleman342 wrote:
Quote: |
Is there such a thing? |
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ZoneV
Joined: 09 Nov 2009 Posts: 1633 Location: Germany
Expire: 2011-12-02
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Posted: Fri Nov 14, 2014 10:51 am Post subject: |
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ZoneV wrote:
I worked a bit on a diffuse large format enlarger head ~15 years ago. With one tube it is hard or dark to get good diffuse light with homogeneous illumination.
A Ulbricht sphere layout would be great for homogenity - no light direct on the ulbricht sphere output hole, all light must be reflected in the difusse white sphere. But much light is lost.
Today with cheap LED panel I would try to get a panel much bigger than the largest film format as lightsource. And some diffusing material in front of it. Probably mirror box around it. _________________ Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
I AM A LENS NERD!
Epis, Elmaron, Emerald, Ernostar, Helioplan and Heidosmat.
Epiotar, Kameraobjektiv, Anastigmat, Epis, Meganast, Magnagon, Quinar, Culmigon, Novotrinast, Novflexar, Colorplan, Sekor, Kinon, Talon, Telemegor, Xenon, Xenar, Ultra, Ultra Star. Tessar, Janar, Visionar, Kiptar, Kipronar and Rotelar.
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