1st November 2003, 12:23 PM
1st November 2003, 12:33 PM
How to decide and measure the size of the pinhole?
I use the scanner method. Just put your pinhole plate onto your flatbed scanner, set it to the highest possible resolution, and scan the part containing the pinhole.
Then, using the same high resolution, scan the markings on a ruler.
Use the circular marquee tool to cut out the hole in the first picture you scanned, then paste it onto the image of the ruler in a row, like so.
Let's say each marking here is 0.5mm. As you can see, in this example, 4.5 of the holes span a distance of 1 mm. The diameter of the pinhole is therefore 1mm divided by 4.5 = 0.22mm.
The focal length of your pinhole camera is the distance between the pinhole plate and the photo paper (measure it with a ruler!).
You can find out the optimal pinhole size for the focal length of your camera using the calculator found here:
Eg if the height of the tin (distance between pinhole plate and photo paper) is 70 mm, the optimal pinhole size would be 0.353. This means that in the above example I would have to enlarge my pinhole, to prevent diffraction artifacts.
1st November 2003, 01:54 PM
1st November 2003, 02:15 PM
1st November 2003, 02:47 PM
Wha.. Got any images to show?? I've never seen a pinhole image before.. =x
1st November 2003, 06:17 PM
is there any digital back for this type of camera?
1st November 2003, 08:49 PM
The focal length calculator will also work out for you the aperture of your pinhole camera, so that you can meter the shutter speed. The ISO speed of photo paper varies between 2 to 10. But wild guesses work just as well - "hmmm... bright sunlight... 1 minute... cloudy skies... 1.5 minutes."
Once you have composed your shot and made the exposure, it's time to develop the photo!
You can get the tongs (optional) from Ruby Photo. The trays are $1.90 each from Giant Supermarket (Ruby sells similar trays for 6 bucks each). You will need developer and fixer, and optionally stop bath and HCA.
Switch on the safelight, then open the tin. Take out the photo paper, and leave it for about 1 minute in each tray of solution:
1. Developer - this will make the image magically appear as it converts the silver halide which has been exposed to light into metallic black silver. This is the step that makes developing your own stuff all worthwhile.
2. Stop bath - this stops the developer from continuing to work, once your image is nicely developed. I use plain water, but you can buy stop bath, or use a few drops of cheap synthetic vinegar (which is all that stop bath solution is) in the stop bath tray.
3. Fixer - this "fixes" the photo paper by chemically dissolving and removing any remaining photo-sensitive silver halide on the paper, so that you can view the print later.
4. HCA - this step is optional, and helps to chemically remove any residual fixer (hypo) and thus significantly reduces washing time. It is important to remove all traces of fixer, because residual fixer causes yellow staining of prints in the long term.
Actually the process is identical to film development.
Developer costs less than $15 a bottle and fixer is less than $10 a bottle, and both can last a long time.
1st November 2003, 09:11 PM
8th November 2003, 01:09 AM
20th January 2004, 03:08 PM
24th January 2004, 12:22 AM
Wow...I guess I missed this one too...
A definite lil project for me in my free time...now must go find a dark room in my home...difficult thou...
24th January 2004, 12:46 AM
24th January 2004, 10:02 AM
Thanks for the link. I had wanted to see the pictures but did not know they had been put online.
Hmmm, must bring a tripod next time. All my pics so far just rest the camera on the ground.
24th January 2004, 11:35 AM
25th January 2004, 01:47 AM
i taped a a piece of paper layered with gaffer over my dSLR mount, poked a hole in the center with a needle, and did a few long exposures. It worked, though getting the exposure right was trial and error. (And hey, digital helps! Instant feedback!)
Just an idea for those with dSLRs and too lazy to mess with film development.
25th January 2004, 02:21 PM
latest issue of Grain
i think the latest issue of Grain has two really interesting articles on pinhole photography too! one was done with a cheezals container and the other with a roast duck.
read the issue. it's worth checking it out.
10th April 2004, 04:31 PM
Can we make this a sticky?
10th April 2004, 07:54 PM
Nope I think it's too "niche" to be made a sticky. Otherwise the first page will be full of stickies. A search for "pinhole" will easily bring it up.
Originally Posted by yaoxing
11th April 2004, 12:46 AM
Thanks for the advice.
Originally Posted by StreetShooter
4th March 2005, 01:48 PM