Re: Building my first serious pinhole

Thanks, Jim. I was just curious. I feel vignetting, most of the time,
only adds to an image...but just a personal choice, I guess. What is
the 3000 speed film you're using, by the way? Is that just the 3200
Kodak for 35mm you're talking about, or something else? Thanks again.

Diana
On Dec 1, 2004, at 2:24 PM, JS2RT@aol.com wrote:

> Diana,
> The reason I limit the amount of vignetting I get is that I don't
> care for it. I have made two pinhole cameras (one was a Pintoid, the
> other from a tin cookie container) that vignette heavily. For me, the
> vignetting that surrounded the image detracted from the image itself.
> As a result make my 4x5 pinhole cameras with at least a 100 mm focal
> distance and my 5x7 camera with 120 mm or more.
>
> My preference is for making contact prints from the 5x7 rather than
> enlarging the 4x5s. If I want a normal rather than a wide angle
> perspective, I will use a pinhole Polaroid. This has the added
> advantage that by using 3000 speed film I can hand hold the camera.
>
> Jim
>
> dhbloomfield@bellsouth.net writes:
>
>
> Hi Jim,
>
> That sounds like a really nice camera.  I'm curious, though, why you're
> so intent on avoiding vignetting.  I guess it's just an aesthetic
> choice, but vignetting  (to my mind) is one of the big advantages of
> pinhole images.  In fact, I hate it when I don't get that...    Just
> my
> 2 cents!
>
> Diana
> On Dec 1, 2004, at 9:40 AM, JS2RT@aol.com wrote:
>
> > I have been using my homemade 5x7 pinhole camera for over a year now
> > with both film and paper negatives. I have a focal distance of 120
> mm
> > with a pinhole diameter of .016 inches (.406 mm) for an aperture of
> > f/295. I am starting to see falloff at the corners, however it is
> not
> > objectionable and many do not notice it at all. The 35mm equivalent
> to
> > the 120 mm I have is 24mm based on the height of the negative.
> >
> >  I used 1/2 inch (12mm) plywood from a model shop for the body
> because
> > this plywood has 7 layers of wood. The lensboard is 1/4 inch (6mm)
> > plywood. The pinhole was made from a soft drink can and was taped
> to a
> > 25mm square piece of matboard. Because of the wide angle view of
> this
> > camera, I had to make the opening in the lens board 25mm in diameter
> > to avoid vignetting. All of the joints for the top, bottom, sides,
> and
> > lensboard are rabbeted joints in order to create light traps. The
> rear
> > portion of the top, bottom and left panel are also rabbeted for
> about
> > 38mm to form a ledge for the film holder to rest against. The
> shutter
> > is a sample of countertop material cut to an appropriate shape which
> > pivots to cover and uncover the pinhole. The right side panel is
> > shorter to create the 30mm opening for the film holder. The back
> fits
> > within the top, bottom and left panels and is held in place with
> > screws from the top and bottom. The back has two springs from metal
> > picture frames to hold the filmholder up against the ledge. The
> tripod
> > socked in the bottom is a 1/4x20 T-nut which is covered on the
> inside
> > with a scrap of plywood. The interior is painted flat black and the
> > exterior is varnished. I drew sighting lines on the top and both
> > sides.
> >
> >  Good luck with your camera and I hope you enjoy it as much as I have
> > enjoyed this one.
> >
> >  Jim Stewart
>
>

_______________________________________________
Post to the list as PLAIN TEXT only - no HTML
pinhole-discussion mailing list
pinhole-discussion@spitbite.org
FAQ at http://spitbite.org/pinhole-discussion/list.html
Received on Wed Dec 1 12:11:37 2004