From: Art Chakalis (achakali@gcfn.org)
Date: 12/12/01-10:13:58 AM Z
John,
I have been using a Durst 606 retrofit with a 300 watt halogen source for
15+ years. At the time I built it, I spoke with an optical
engineer/designer at ? (I need to pull out my notes as it was either Omega
or Besler) to pick his brain, As I recall, they actually had some high
energy applications but never mass produced it. I believe it used a bank
of flash tubes . . . it would be great to find one used.
As to cooling, mount the blower in a separate location keeping it
unattached to the head and/or base. Use flexible tubing (I used 2" shop
vac) to feed the air into the lamp housing.
As to UV absorption, though I thought about it I never tried to check
transmission. I tested and use a 50mm 2.8 Nikor, which I focus using
visible light (the UV focus will will be slightly different) and it works
fine. Though I have putzed in a number of processes my real focus has
been dichromate based. Look up the dichromate sensitivity curves again . .
. UV is not as big of a concern as perhaps you believe . . . the near
UV/blue are significant.
If you want I can attach a few pictures of the my machine to a note . . .
let me know.
I hope this helped.
Sincerely, Art
On Tue, 11 Dec 2001, John Cremati wrote:
> I am certain that heat is going to be the major issue. I need to
> find out is how it is dealt with.. How would you cool the film to make a
> exposure with out vibrating the film with a blower... I also need to know
> if the lens acts as a extra thick UV filter which also may absorb infrared
> heat with the possibility of cracking the lens.....
> I have various high output exposure lamps and power supplies, used for
> silk screen making in 3000 and 5000 watts, .. along with a pulsed xenon
> box with 6 light tubes at 10,000 watts.. I would like to hang one of these
> on a huge old vertical 8x10 enlarger...I had checked out the Fresson site
> so obviously something like this is being done...JC
>
On Mon, 10 Dec 2001, John Cremati wrote:
> Does anyone have any experience with a high output ultraviolet
projecti$
omate sensitized papers ..? John
>
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