Why not just purchase a ready-made, proper one and save the bother and
frustration of probably not being able to make a really good one? They're only
$29.99.
http://www.calumetphoto.com/ctl?PAGE=Controller&ac.ui.pn=cat.CatItemDetail&ac.item.itemNo=PY2135&ac.cat.CatTree.detail=y&type=PRDINDEX
If this link gets screwed up, which I suspect it will, just go to
http://www.calumetphoto.com/ and do a search for "pinhole" or "finney," then
look on the second page.
Walt
--
"Anything more than 500 yards from
the car just isn't photogenic." --
Edward Weston
-------------- Original message ----------------------
From: Andrew Dacey <adacey@xxxxxxxxx>
>
> Hello,
>
> I know this has been discussed before but I couldn't resist posting
> something on topic.
>
> I had taken a pinhole photo workshop last summer and it was a lot of
> fun (the self-portrait on my homepage, http://www.tildefrugal.net/ is
> from the workshop). I'd like to do some more pinhole shooting but
> would prefer to use film instead of paper for the negs so that I can
> do enlargements.
>
> I have some plans to possibly build a 4x5 pinhole camera at some point
> but that's more of a long-term thing.
>
> I figure for the short-term a 35mm pinhole makes more sense. I know a
> lot of people have converted body caps into pinholes so that's one
> option. I had also seen someone post a link where a person had added a
> pinhole aperture to a 50mm lens (although not a true pinhole as this
> retained the optics). I'd thought of converting a 50/1.8 but don't
> have one to use (I know, I should turn in my ZA membership card right
> now, to be fair I gave mine away in order to enable another). So, that
> leaves the body cap route.
>
> Mainly what I'm looking for is some info on how to go about the
> conversion. First, is a body cap usually light tight around the edges
> (obviously I could check this fairly easily but may as well start with
> the wisdom of the list). Second, what's the focal length and what size
> pinhole would be needed to cover the 35mm frame? I'm assuming that it
> would be the flange distance plus however much the body cap extends
> out from there, is that right? And finally, what's the best method for
> doing the conversion? I thought of drilling it but don't know if I'd
> have a small enough bit and has the drawback of having a fairly thick
> piece of plastic so I'd need a wider opening to avoid vignetting I
> imagine. The other thought would be to cut out a larger hole and then
> attach a copper shim (which I do have). The added bonus I see here is
> that I could use extension tubes and a different shim to get different
> focal lengths.
>
> Any thoughts or recommendations?
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