[alt-photo] Re: Alternative Exposure Unit (no pun intended)

[Paul Viapiano]

Peter, thanks for these caveats...much appreciated.

Paul


----- Original Message ----- 
From: <pfriedrichsen at sympatico.ca>
To: "The alternative photographic processes mailing list" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Thursday, March 11, 2010 3:12 PM
Subject: [alt-photo] Re: Alternative Exposure Unit (no pun intended)


>I would like to mention one other caution on the fotodiox unit.
>
> CFLs don't like to be operated in an inverted positon. (especially the 
> larger lamps like these). The heat rises off of the lamp and overheats the 
> electronic ballast which has some heat sensitive components. Worse, is the 
> large number of surrounding lamps all heating each other up (480 watts for 
> the whole lot). The inner lamps may have a very short life.
>
> I think you would need to add some forced air cooling if you wanted a 
> reliable exposure unit.
>
> Peter Friedrichsern
>
>
>
>
>
> At 04:58 PM 03/11/2010, you wrote:
>>Christine, Group:
>>
>>I had been using a custom made BLB set up with 8-24" bulbs for over 15
>>years. The bulbs are very expensive to replace and my exposures were 90
>>seconds to 7 minutes. Last month Barry Schmetter brought in a Fotodiox 
>>unit
>>for me to use for a gumprint demo at the Large Format and Alternative
>>Photography Gathering (Metro Wash DC). Using my gum/pigment mix 1:1 with 
>>15%
>>ammonium dichromate sensitizer I was able to reduce my first emulsion from 
>>7
>>minutes to 70 seconds. It was perfect. The second emulsion was correct in 
>>30
>>seconds. This unit has completely changed the way I print.
>>
>>  http://www.fotodiox.com/catalog/product_info.php?products_id=78 fitted 
>> it
>>with 16 Bright Effects (swirly type; 26 watts daylight or 6000K from 
>>Lowes).
>>The unit is intended to sit on a lighting tripod but I added a clamp and
>>attach it to a heavily loaded bookcase. The unit is currently going for 
>>$135
>>+ shipping. Add $30 for a clamp if you can't rig up something, a builder
>>pack of the bulbs, and you have a very fast, compact, and portable 
>>exposure
>>device.
>>
>>Best,
>>Carole
>>
>>
>>
>>On Thu, Mar 11, 2010 at 4:18 PM, Christina Anderson 
>><zphoto at montana.net>wrote:
>>
>> > Has anyone bought one of these and used for alt or gum?
>> > And what is the best URL for a plan to build one's own?  Apparently the
>> > plan I hand out to students out of Nadeau's is incomplete, but since I 
>> > am a
>> > building failure, I can't explain why it is incomplete.  I wouldn't 
>> > know a
>> > magnetic ballast from a martini frankly.
>> > Chris
>> >
>> >
>> > http://www.silkscreeningsupplies.com/site/799934/product/RXP2024
>> >
>> > Christina Z. Anderson
>> > christinaZanderson.com
>> >
>> > _______________________________________________
>> > Alt-photo-process-list | http://altphotolist.org/listinfo
>> >
>>_______________________________________________
>>Alt-photo-process-list | http://altphotolist.org/listinfo
>
> _______________________________________________
> Alt-photo-process-list | http://altphotolist.org/listinfo