[pure-silver] Re: Light source vignette or hopefully avoiding it


----- Original Message ----- From: "Nick Zentena" <zentena@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, July 14, 2006 3:35 PM
Subject: [pure-silver] Re: Light source vignette or hopefully avoiding it


On Friday 14 July 2006 17:07, Richard Knoppow wrote:

think you may have an easier time making an enlarger from an
8x10 view camera. The camera must have front focusing
capability. The light source can be made using fluorescent

I've got an 8x10 monorail that could be converted but I don't like the idea
of trying to build a horizonal setup.

The light box is mounted on a support which also takes
the camera. The camera should not have to support the light
box. The new back is snugged up to the light box. The whole
thing is mounted on a stand. For temporary use a heavy duty
tripod will do.

If I used the monorail I'd mount a couple of 1/4" knobs to a table and attach
the monorail tripod mounts to that. Something like these:


http://www.leevalley.com/wood/page.aspx?c=1&p=52801&cat=1,43455,52800

For the back I'd build a box with a drawer for the negative stage. The box
would be big enough to sit on the table. But the easel end is the part that
bothers me.



To find the extension needed for the negative holder for
the Elwood first determine the smallest print you will want
to make. This determines the greatest distance from lens to


I used 2x in the formula. Also figured a 12"x12" negative and a 5" narrow
spot. The smallest spot is actually 5.5" and the negative will of course be
smaller then 12x12. So I think a 3" gap between the old part of the enlarger
and the negative would work. Of course I could have screwed up the math -)

Nick



Whoa, what a great site! They even have knobs which look like the ones on my Calumet C-1.

I haven't thought this out for a monorail although it should work. I figured out a way to make an enlarging attachment for my Agfa flat bed camera. My idea is that it would be vertical but one could also make a horrizontal enlarger if desired. Not all of this is original. The U.S. Army had an enlarging and copying system for the Kodak 2D and Agfa cameras. It came in a large trunk, which became the base. On this was placed a table top with a rail for the camera. the illumination was from a light box which could be used as either the lamp for the enlarger or for illuminating transparencies for copying. This was a big and heavy rig but some of the ideas are inspiring for a simpler arrangement.
I chose fluorescent over incandescent lamps because they generate a lot less heat for the light output and a box for them is fairly easy to make. Of course, I am thinking about B&W, if you want to do color I suggest looking around for a real 8x10 enlarger. However, the good ones are all the size of a medium milling machine and nearly as heavy.
I think my camera adaptor is practical. Its on the back burner right now but I think I will have to try making it.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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