Placement of diffusion glass in enlarger

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Bogdan Karasek - 23 Jun 2006 15:19 GMT

Hello,

I want to diffuse the light in my Omega D2 enlarger. What is the best
placement of the diffusion glass, above the condensers or below, just
above the neg. holder?

Thank you for any information.

regards,
Bogdan

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Bogdan Karasek
Montréal, Québec e-mail: bkarasek@videotron.ca
Canada

"Wovon man nicht sprechen kann, darüber muss man schweigen"
"What we cannot speak about we must pass over in silence"
Ludwig Wittgenstein
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Richard Knoppow - 23 Jun 2006 16:46 GMT

> Hello,
>
[quoted text clipped - 6 lines]
> regards,
> Bogdan

The diffusion glass Omega supplied goes in the condenser
barrel just below the condenser, i.e., next to the film. The
volume of light is very considerably reduced, its not a
practical system.
The source in enlargers like the Omega and Besler are
partly diffused anyway. The lamp is a large bulb with an
"opal glass" diffusion coating rather than the etched glass
surface of ordinary frosted reading lamps. It is the large,
diffuse, surface of the lamp which eliminates the need for
focusing the condensers exactly each time the lens is
focused.
If you want a diffusion source its best to convert to
either a color head or a cold light head.

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Richard Knoppow
Los Angeles, CA, USA
dickburk@ix.netcom.com

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Jean-David Beyer - 23 Jun 2006 18:48 GMT

>> Hello,
>>
[quoted text clipped - 11 lines]
> volume of light is very considerably reduced, its not a
> practical system.

I tried the same thing with my Beseler 45MCRX, and it, too, was not
practical. It diffused the light OK, but even with a 250 watt bulb where the
150 watt one was supposed to be there was not enough light for practical
enlarging.

> The source in enlargers like the Omega and Besler are
> partly diffused anyway. The lamp is a large bulb with an
[quoted text clipped - 5 lines]
> If you want a diffusion source its best to convert to
> either a color head or a cold light head.

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dan.c.quinn@att.net - 23 Jun 2006 22:47 GMT

> Hello,
> I want to diffuse the light in my Omega D2 enlarger. What is the best
> placement of the diffusion glass, above the condensers or below, just
> above the neg. holder?

I've the B8 version of the D2. IIRC there is perhaps as much as
2mm twixt the upper surface of the carrier and the bottom surface
of the lower condenser.
A thin frosted or opal glass or other material might be attached
to or laid on the carrier itself. If image magnification is not great
exposures should be within reason.
You've just reminded me of another something to get around to
one of these days. Dan

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