by damned truths

submit your photo

Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

Tag Info

Hot answers tagged


Summary A zone plate is a way of focusing light, like a lens, but using Fresnel diffraction instead of refraction. This is cool from a theoretical point of view, because it demonstrates the wave nature of light. And it's cool from a photography point of view, because the images produced have a unique glow, with a impressionistic almost-painted look. If ...


Is it safe to try this setup on my DSLR(since there will be no lens), mine is Canon EOS 1000D? It is possible to make a pinhole from a DSLR. Basically, buy a spare body cap, then make a small hole in its center. Don't destroy the only cap which comes with your camera, you may need it later. Google for "DIY DSLR pinhole" for multiple instructions. But ...


I think the dog is in focus, but it's not sharp. And it's not sharp because a magnifying glass isn't corrected for any aberrations, chromatic or otherwise. In other words, it's a technically poor lens (though you're still welcome to have some fun with it, of course). Lenses focus light by slowing it down as it passes through the glass, which bends the rays ...


This is very similar to a Holga medium-format toy camera, where the shutter speed is approximately ¹/₁₀₀th of a second (give or take the particular camera you have and how it is feeling today) and the aperture is about f/13 (regardless of whether you have the alleged aperture lever set to one of its two non-functional options). So how do you get the ...


I think the search phrase you're looking for is "DIY toy lens". This will lead you to a number of interesting projects, including this one made from toy magnifying glasses like the one you were playing with. The basic construction is quite simple: an extension tube is used to mount a tube of cardboard to the camera, and the lenses mounted within that tube. ...


The answer you don't like - out of all the digitally added film effects I've tried (and I've tried many along with actually shooting film) none really come close. That is not a scientific type of knowledge, but rather an impression. So if you really really want film look, you'll end up shooting film and even then, you'll most probably be disappointed on how ...


They're an alternative to lenses. Basically using diffraction instead of refraction to focus light. They're very common in some forms of lithography when dealing with wavelengths that glass blocks. You can actually think of a single pinhole as a degenerate case of a zone plate.


I can't address your question with personal experience, but the astronomy hobbyists get very good results. They not only polish their lenses, but they make them from a flat piece of glass. Its hard to see why you would not be able to do it. it may take a lot of time, and as you suggest, its not economical, but this is a hobby. I say go for it if you have ...


There are separate issues. "Create" a lens - let's interpret that to be a design act - designing the curve according to focal length, required dispersion, etc. Yes, that's doable. There's lens design software around that will take a set of optimization criteria and some constraints and spit out a set of curves and glass types. Rustle up specific software ...


No built in picture style exists for lomo on the Canon 50D camera. Basically you just need to add a vignette, and do a cross processing style that you can achieve in most photo editing software. You also may want to add fake light leaks to get the full effect. A tutorial for the effect can be found at digital photography school here.


The Wikipedia article you cited does a good job of detailing what pinhole photography is. To summarize in brief: A pinhole camera is the first and simplest form of camera- essentially a lightproof box without a lens and with a hole on one side. The light from the scene the pinhole is pointed at passes through the hole in the box and is projected (in ...


If you split your image into red, green and blue channels, and then: Leave the green channel alone. Scale the red channel up slightly, around the centre of the image Blur (slightly) the outside of the red channel: you could use a radial followed by rotational blur to do this. Scale the blue channel down more than you scaled the red channel up, still about ...


You'll have more CA by using fast glass, i.e. where the ratio of focal length to diameter is smaller; for more chromatic aberrations, you'll want to avoid achromatic lenses. Along with CA, faster lens will also make image more misty (spheric aberrations); you can reduce that by stopping the lens down using an aperture disc (I cut mine out of a plastic ...


Judging by the parts, I'd say the shutter speed is fixed and there is nothing there to make a variable aperture, unless they have swappable discs that can stop down the lens. I think that's how the lensbaby works. But otherwise yes, for this $20 DIY camera you're going to have to take everything at a fixed EV :)


There are numerous filters and special lens systems that allow you to create special effects in-camera. One of the best known is Lensbaby, a specialized lens system that makes it possible to create all kinds of effects. Beyond Lensbaby, there are soft-focus filters that can help to soften a shot, while slight over exposure can produce the washed-out effect. ...


If you use Lightroom, there are any number of presets you can use to achieve film-like effects; this is probably the easiest way to achieve what you want. Have a look here Additionally, the film grain tool in Lightroom adds grain to photos to make them look more film-like.


You are correct that you could simulate this in an editor by shifting the layers a bit, however since the amount of fringing grows as things are farther away you end up needing to slice and dice the image and shift different parts of the image different amounts. Also the corners of the lens tend to shift more than the center, so you would need to shift more ...

Only top voted, non community-wiki answers of a minimum length are eligible