Re: light source basics question

Dwaine,
Sorry, is more than 1/2 stop the correction.
Giovanni

----- Original Message -----
Wrom: NNYCGPKYLEJGDGVCJVTLBXFGGMEPYOQKEDOTWFAO
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, September 22, 2004 6:18 PM
Subject: Re: light source basics question

> Hi Dwaine,
> I just finished installing my 1000 watt metal halide lamp.
> By the way, I installed on top of a trolley so I can move the lamp to use
it
> anywhere, on the bottom of the trolley (5 feet tall) I have two removable
> trays to put the contact frames.
> I am doing exactly as it is explained on Sandy article and using 30 inches
> for a 14x11 print on canvas 16x20.
> It works as when I print using sun exposure thru my window glass in my
> apartment in NY.
> So far very good and no problems but I have been working with it for two
> days only.
> Remember never touch the bulb.
> I also follow most of the advices given on the Livick manual but I like
> better to use cianotype for the cyan color.
> Regards
> Giovanni
>
>
> ----- Original Message -----
> Wrom: BUZXUWLSZLKBRNVWWCUFPEGAUTFJMVRESK
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Tuesday, September 21, 2004 10:37 PM
> Subject: light source basics question
>
>
> > Hi all,
> >
> > I am in the midst of assembling the equipment I need for starting gum
> > printing and I have a question about my choice of light. I have
> > decided to go with a 1000 watt metal halide grow lamp, but I have two
> > questions.
> >
> > 1. What is the optimal distance from the contact frame for this type
> > of light? Somewhere I got the idea of 40 inches, but that might have
> > been as a result of a certain amount of falloff and hence, making
> > sure the hotspot of the light hit the contact frame. In my case, I
> > plan on doing most of my gum prints smaller than 11 x 17, although I
> > might do some longer panoramas, up to maybe 24 inches long and about
> > 6-10 inches wide. I'm making a 16 x 30" contact frame, but I might
> > also make a smaller one too, see how things go.
> >
> > 2. What is a good time range for starting exposure tests? I think it
> > was in Sandy King's article on unblinking eye that I read exposure
> > tests where for 5 minutes using this light type. Obviously the time
> > is going to be related to the distance from the light to the
> > negative, but I am just trying to establish a baseline for starting.
> > I am using the chemicals recommended in Livick, so potassium
> > bichromate.
> >
> > Thanks all for your help!
> > Dwayne
> >
> > --
> > Dwayne Sandall
> > It is not because things are difficult that we do not dare; it is
> > because we do not dare that they are difficult." -Seneca
> >
>
Received on Wed Sep 22 20:05:14 2004