dsbryant@telocity.com
Date: 12/11/01-08:04:44 AM Z
>
> Folks:
> Glass tends to absorb UV. Plate glass lets nothing through below 330 nm.
> On the other hand, Quartz glass (no soda-lime or lead) is virtually
> transparent to UV. I imagine that, in their french way, the Fressons are
> noting that their enlarging lens and film holders are made of quartz glass.
> I have used an OLEC 1500 watt unit to make direct gum prints. I placed
> the unit above the enlarger housing with a small fan in between and had no
> problem. Light output was reduced, however, to 1/2 its expected value
> (measured with a UV meter) due to absorption by the system. Cheers, Ed
So what kind of exposure times were you getting Ed?
Thanks,
Don Bryant
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