Re: hello.....

Thanks! I have the book on the shelf and will go from there. Mark

>-- Original Message --
>From: "G.Penate" <penate@rogers.com>
>To: <pinhole-discussion@pinhole.com>
>Subject: Re: [pinhole-discussion] hello.....
>Reply-To: pinhole-discussion@pinhole.com
>Date: Fri, 9 Aug 2002 11:16:19 -0400
>
>
>
>----- Original Message -----
>From: "Mark Interrante" <mark@interwalk.com>
>
>
>>Ok, I've a question. I recently saw Martha Casanave's Lenin photos
>>(http://marthacasanave.com/lenin.html)
>>and I think they are beautiful. She uses a non-optimial pinhole, and
I'd
>>like to know if people have any idea how much larger I would need to make
>>a pinhole to achieve this effect?
>
>I missed this post, here is a somewhat late suggestion: Eric Renner's
book
>has
>a set of pinhole images of the same subject (I believe it is the portrait
>of a
>nun or a nun looking girl), each image was made with a differente size
of
>pinhole and if memory serves me well the f/stop is shown for each image,
>if that
>is so, just take a a look at the different images, select the one that
best
>represent the effect you want and find how mant stops there are between
the
>sharpest one and your selection, That would be the number of stops your
>pinhole
>should be larger than the optimum, in order to get a similar effect.
>i.e.: your selection is f/128 and the sharpest is f/320, that gives you
almost
>3
>stops between 128 and 320 (128, 180, 256, 360), so the pinhole you want
>should
>give you an f/stop 3 stops bigger than the optimum.
>
>The above is just a good starting point as there are some othe factors
to
>take
>into account.
>
>A more hands-on approach would be to make a series of pinholes giving 1
stop,
>2
>, 3, 4, 5 stops and so on, larger than the optimum. That is easily achieved
>by
>multiplying the optimum diameter by the f/stop sequence starting with 1.4
> so
>the sequence goes 1.4 - 2 - 2.8 - 4 - 5.6 - 8 - etc., then make exposures
>of
>the same scene, using all of the pinholes, develop the film, print the
images
>to
>the size you'd normally be enlarging the negatives and then select which
>one is
>the ONE for you. After the test you should know how many stops larger
should
>the pinhole be, that info could be applicable for other pinhole focal length.
>
>An example would be:
>Camera = your SLR
>Focal length = 50mm
>optimal pinhole = 0.010"
>series of pinholes:
>(0.010 x 1.4) = 0.014" (1 stop larger that optimum)
>(0.010 x 2 ) = 0.020" (2 stops larger)
>(0.010 x 2.8 ) = 0.028" ( 3 stops larger)
>(0.010 x 4 ) = 0.040" (4 stops larger)
>
>Anyway, you get the idea.
>
>Guillermo
>
>
>
>
>
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Received on Fri Aug 9 16:38:09 2002