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28 votes
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Why is the hole in a pinhole camera usually a circle?

From Wikipedia's Pinhole camera article, The best pinhole is perfectly round (since irregularities cause higher-order diffraction effects), and in an extremely thin piece of material. Industrially ...
scottbb's user avatar
  • 32.8k
19 votes
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All images are out of focus with pinhole body cap

This is exactly what one expects from a pinhole lens. Normal lenses A normal lens has a big opening and bends all the light rays coming from a point-like object to cross in a point behind the lens. ...
sweber's user avatar
  • 480
19 votes

Why doesn't my pinhole image cover the film?

You have vignetting. It's probably not from the pinhole failing to cover the film; more likely the pinhole is in too narrow a hole in the front panel material, and that material is blocking light ...
Zeiss Ikon's user avatar
  • 7,141
16 votes

Why doesn't my pinhole image cover the film?

Even though this has been answered, I wanted to visualize this interesting problem. If we assume light travels in straight lines, then the wall thickness and hole diameter both matter. In these ...
Matthias's user avatar
  • 263
15 votes

How can I test that the image is inverted in a pinhole camera?

Replace the back wall of the camera with a sheet of tracing paper, ground glass (or similar translucent material) and observe the resolved image from behind the camera. You may need a dark sheet over ...
db9dreamer's user avatar
  • 1,242
11 votes
Accepted

Will a pinhole camera work with instant film?

You definitely have to change the design of the camera. This HowStuffWorks page explains how instant film develops well enough. Essentially, the film cassette contains rollers that roll out the ...
OnBreak.'s user avatar
  • 20.5k
11 votes

Why doesn't my pinhole image cover the film?

Regardless of the distance from the hole to the film, your camera has a maximum field of view of ~8 degrees. This is because no light ray that is off-axis by more than ~4 degrees can make it through a ...
nanoman's user avatar
  • 361
10 votes

Why is the hole in a pinhole camera usually a circle?

The pin-hole casts (projects) tiny image circles on the back wall of the camera. This is also the place we position photo sensitive material so that we can replica this image on film or paper or ...
Alan Marcus's user avatar
  • 39.2k
10 votes

All images are out of focus with pinhole body cap

Your results are GREAT. You show exactly what one should expect using a "pinhole" lens. The reason your results are different from your Google search is because the image that you found wasn't ...
Stan's user avatar
  • 5,521
8 votes

How can I test that the image is inverted in a pinhole camera?

Make a simple, non-photographic pin-hole camera. Start with a cardboard tube. The round Quaker Oats breakfast box is perfect for this job. You can use any cardboard mailing tube. Cut off both ends, ...
Alan Marcus's user avatar
  • 39.2k
8 votes

How to calculate the optimal pinhole size?

The earliest investigation of the right constant c that I am aware of is Petzval's 1859 On the camera obscura. The paper is predominantly about a new lens design he has created but he begins with an ...
brett stevens's user avatar
6 votes

Concept of focus for a pinhole camera?

Depth of field for a pinhole camera is theoretically infinite. There is a formula to determine optimum pinhole size for any given focal length, the distance between pinhole and film. In practice we ...
Laurence's user avatar
  • 1,696
6 votes
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Storing pinhole photos in the field

While some care is needed to avoid accidental light leaks, light-proofing a container enough to safely store film or paper is not a colossal effort. Something as simple as duct tape over a few ...
TheLuckless's user avatar
  • 2,330
6 votes
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The ideal pinhole camera has an infinite depth of field

Yes, that means that everything is in focus (which implies that the sensor doesn't even need to be a plane).
xenoid's user avatar
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5 votes
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Concept of focus for a pinhole camera?

When we view a photograph made by a pin-hole camera, we are viewing an image comprised of countless circles. These are projected on film by the pin-hole. Their size is a function of the diameter of ...
Alan Marcus's user avatar
  • 39.2k
5 votes
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Real world differences in pinhole sized apertures

You can calculate an approximation of the size of the actual diffraction spot (or Airy disk) as a function of your pinhole f-number and wavelength of light: D = 2 x 1.22 x lambda x F/# Across the ...
calocedrus's user avatar
4 votes
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Can I combine a pinhole bodycap with macro extension tube to adjust focal length?

Yes, you can. But keep in mind that the optimal performance of a given pinhole is related to focal length used. More on the theme can be found here: How to calculate the optimal pinhole size?. Using ...
Jindra Lacko's user avatar
  • 5,990
4 votes

Can I combine a pinhole bodycap with macro extension tube to adjust focal length?

Can I combine this with a macro extension tube to adjust the focal length? Yes, you can. You can make some extension tubes with cardboard too to make some preliminary tests. P.D. Just make sure you ...
Rafael's user avatar
  • 24.9k
4 votes

All images are out of focus with pinhole body cap

Images you see done with pinhole online may be sharper for several reasons. Size of the original... 4x5" film Quality of the pinhole.... laser cut vs drilled vs pin pushed through foil flare from ...
Davepix's user avatar
  • 115
3 votes

Will a pinhole camera work with instant film?

You can easily convert most any instant camera to a pin-hole camera without damaging the camera in any way. If you do what I tell you, your instant camera will perform exactly as a pin-hole camera, in ...
Alan Marcus's user avatar
  • 39.2k
3 votes

Why is the hole in a pinhole camera usually a circle?

First of all, I am going to be practical. Here is an example of a sharpening tool. A good way to have a sharp tip is by doing a circular rotation while sharpening a pencil. Not only when using the ...
Rafael's user avatar
  • 24.9k
3 votes
Accepted

How does imaging plane's distance affect the picture in a pinhole camera?

The image size increases linearly with respect to distance between the pinhole and the film plane. The image gets larger in all dimensions. The image gets sharper as you increase the distance between ...
Aram Hăvărneanu's user avatar
3 votes

How can I test that the image is inverted in a pinhole camera?

How did you look through the pinhole? If you put it far from your eye you have seen nothing. It is small hole and you have seen one "overexposed" point behind dark card. If you put the card as close ...
Crowley's user avatar
  • 1,808
3 votes
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Developing pinhole camera photos - pictures turn cloudy

If you remove the paper from the developer after 20 seconds, the clouding could be caused by uneven development. Look at the recommended development time for the paper and the developer and adjust ...
MirekE's user avatar
  • 5,205
3 votes
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How properly expose a long exposure in daylight?

You are spot on! Use a sewing needle heated in a candle flame and carefully pierce the lens cap. Make a trial exposure and enlarge the hole if needed. Keep in mind that a tiny pinhole will induce ...
Alan Marcus's user avatar
  • 39.2k
3 votes

Is there an instant film I can use for developing pinhole photos with high school students?

The camera looks easy to make. Aaaand you'd be right. The camera isn't the hard part though. Please see my answers to this question (Will a pinhole camera work with instant film?) and this one (...
OnBreak.'s user avatar
  • 20.5k
3 votes

Why is the image plane at Z = f in pinhole camera models?

In the "ideal" pinhole camera (pinhole infinitely small), everything is always in focus, because point source of light in the universe outside the camera, the pinhole and the corresponding ...
xenoid's user avatar
  • 21.4k
3 votes

Why doesn't my pinhole image cover the film?

As timvrhn has commented, the problem is the material the pinhole is in is too thick. Try making a larger hole in the wood with a holder for a piece of metal that has the pinhole. Some people have ...
xiota's user avatar
  • 27k
3 votes

Why doesn't my pinhole image cover the film?

So based on the comments here it looks like one possible solution was to fix how the 'lens' was. Pictured is the old lens and the new lens as a piece of foil, .3mm hole and then tapped to the inside ...
Codejoy's user avatar
  • 331

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