From: Richard Sullivan (email@example.com)
Date: 04/24/00-02:32:46 PM Z
That's been a tough one. As far as I know there is no standard by which
these beasts are measured. There is no such thing as a one "Alt" or a two
"Alt" system. The best I've been able to do is measure it against an F40BL
close packed 8 bulb system. I've used standard DOP palladium with no No 2.
and printed Stouffers wedges. Even then, variations in coating etc or paper
etc can make a difference.
As for the "lively" image look I can't say anything other than it seems to
be there. This might be similar to the witchery that goes on in the world
of Hi-Fi in terms of describing speaker systems. There are often
differences to the ear that scientific measurements don't describe.
People who have moved up to metal halide systems seem to be extremely happy
with the move. At least that is the impression we get here at B+S on the
Helpline. People were referring to the print quality as opposed to the
speed. Stephen Livick of gum fame is dead against fluorescent systems for
gum and says they produce lifeless images as compared to the halide
systems. Check out www.livick.com to see some of his 8 foot by 12 foot full
color gums made of 24 x 30 inch images. Breathtaking!
My guess is that for some reason there might be more mid-tone separation.
Since there is more printing speed, that may in effect cause a separation
the mid-tones. It could also be just be a slight boost in overall contrast.
There seems to be a never ending swamp to walk into here. I once thought of
trying to definitively measure all the variables in the pt/pd printing
system but the permutations just become astronomical.
At 05:32 AM 4/22/2000 -0400, you wrote:
>Could you provide a brief overview of any testing you might have done to
>evaluate printing speed and image quality of point source versus
>fluorescent tube exposure systems.
>>I've been pretty busy as of late. Melody and I have been organizing the
>>PhotoArts Santa Fe 2001 which is looking like it might be a pretty good
>>affair. Most of the organizations in town will be participating.
>>The Marion Center at the College of Santa Fe
>>The Museum of New Mexico
>>Santa Fe Photography Workshops
>>Thge Visual Arts Center
>>Bostick & Sullivan with APIS 2001
>>A slew of galleries and alternative spaces.
>>A Bromoil Workshop
>>The Mammoth Camera Workshop -- Tillman Crane
>>and lots more.
>>I also got inspired by the discussion on the List a while back on the
>>topic of point source versus fluorescent tube exposure systems. So....
>>Gordon Mark, maker of the Hobo 8x10 point-and-shoot camera, and another
>>long time platinum printer, and I have teamed up again and developed a
>>400 watt and a 1000 watt metal halide exposure system. We are both
>>impressed with both the speed and image quality we get with metal halide.
>>We have also designed the system to run very cool and remove any heat
>>build-up on the print and print frame which we believe is detrimental to
>>many alt-photo printing processes. You will not find this kind of cooling
>>on the more expensive commercial units.
>>You can see more about them at:
>>Also keep your eyes peeled as a major photo magazine is scheduled to
>>contain a review of the Hobo.
>>I am also involved in a major overhaul of our online ordering system. Whew!
>>Sorry to bug everyone with this little bit of spam but I thought you
>>might be interested.
>>Note address change!
>>Please change your address book to firstname.lastname@example.org
>>505-474-0890 FAX 505-474-2857
Note address change!
Please change your address book to email@example.com
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