[pure-silver] Re: Test of Efke Direct Positive Paper
- From: Claudio Bonavolta <claudio@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 19 Aug 2008 17:57:46 +0200
I would say so ...
The common sunny 16 rule being f/16 1/100 100ISO, then you exposed 200 times
more, that should make a 0.5 ISO for your paper.
Claudio Bonavolta
http://www.bonavolta.ch
----- Message d'origine -----
De: mmagid3005@xxxxxxx
Date: Tue, 19 Aug 2008 11:17:34 -0400
Sujet: [pure-silver] Test of Efke Direct Positive Paper
À: idcc@xxxxxxxxxxxxxx, pure-silver@xxxxxxxxxxxxx
>I purchased a package of the Efke Direct Positive B & W Positive Paper from
>Freestyle a couple of months ago. Freestyle claimed the ISO was approximately
>1 to 6. To test the ISO I loaded the paper into film holders ands exposed
>them in a Miniature Speed Graphic, which has a pretty accurate Supermatic
>shutter. The day measured to be a perfect Sunny 16 on my Gossen Luna Pro
>meter. I made a series of exposures at f/16 starting at 1/2 second, then
>doubling the time for each successive photo. I developed the prints in Ilford
>developer, 1:14, for 1.5 minutes. I scanned them on my Epson 1680 at 96 dpi,
>with no manipulation. The results are shown at this Flickr site :
>
>
>
>http://www.flickr.com/photos/29332295@N03/?saved=1
>
>
>
>
>It appears the 2 second exposure is the best, though a finer test from 1.5 to
>2.5 sec. would be useful. But assuming the 2 second exposure is right-on,
>then the reciprocal of 2 should be the ISO, or 1/2, for an ISO of 0.5. Am I
>correct in this? The next project with this paper is to use it in my Gordon
>Street Camera, sometime this fall.
>
>
>
>
>The other photo on the site is me in my darkroom with my Folmer & Schwing 4 X
>5 aerial camera, circa WWI.
>
>
>
>
>Marty
>
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