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40

If I have built my device with the correct distance between the flange and the optical plane, does this mean the (inexpensive) lens I am using is bad? If you had built your device using the proper specified flange distance of 17.526mm instead of rounding it off to 18mm you probably would not be asking this question. 0.474mm doesn't seem like much, but it ...


16

I've been looking around for this information too! I finally found the answer (after stumbling across your question first) at this website. According to that page, the formula is: OD = -log T SN = 1 + (7/3) OD where T = transmission rate, OD = optical density, and SN = shade number. For example, shade #10 gives SN = 10, OD = 27/7, and T = 0.000139, or ...


13

Canon wins hands down in this regard. Many of Canon's compacts can run CHDK (sources), which exposes otherwise unavailable functionalities. The more recent DSLRs can run Magic Lantern (sources). Magic Lantern adds huge amounts of functionality, including the ability to shoot timelapse and HDR within the camera, and a built-in intervalometer. Manipulating ...


12

The most available large sheet material is corrugated cardboard. If you have a single layer sheet, you should first glue at least another single layer sheet on top of it to make it more stable. Rotate one of the sheets by 90° so that the "grain directions" of the layers cross each other. Like plywood. For the reflective surfaces: White paper provides a ...


11

The Ray-Ban B-15 created for the US Air Force. These are brownish and block 100% of all UV rays and only 15% of the remaining visual rays. The most popular for general use is the Ray-Ban G-15, a green + gray pigment. The Ray-Ban B15 XLT are also green + brown but with lower density. The key fact for a filter to be distortion free is both surfaces are ...


11

The following method worked for me to stiffen up a generic fakey-pod (i.e., meaningless name / brand gorillapod clone). This may or may not work for your version. I only had problems with a few joints. These lacked stiffness when being bent and would not hold position. The joints push together – ball-end into socket. They dismantle by being ...


10

Not the same camera in these photos, but the button Stan mentioned should be there in your Olympus too. Location of the rewind release button: ^^ The release button is right there, underside of camera, where the sprocketed axel is inside the camera. Small detention around the button. Keep the button pressed down while you cock the shutter. ^^ Olympus Pen ...


9

No, there's no conversion for LCDs — and you wouldn't have anything approaching the resolution you'd want for a print that size anyway using a digital projector. The usual procedure for making alternative process prints from digital files is to print a negative on transparency film. It's the go-to method for cyanotypes, as well as for platinum/palladium and ...


9

If not, do I move the lens away or closer to the optical plane to fix the problem? If the lens will focus on near subjects, but not on a subject at "infinity," then that means that the lens is too far from the sensor. You need to move it closer.


8

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 ...


8

Canon There is a hacked firmware extension for Canon called CHDK, which is pretty extensive and well-documented. A lot of the features are in-camera I think, but there are UBASIC scripts for doing intervalometer type stuff. There are a lot of CHDK-related questions and answer on this site. Nikon Nikon has an official SDK which allows you to: query/...


8

I can't summarize the whole optical physics theory behind pinhole (mostly because I don't have the proper knowledge!), but I try to explain why there are different values for constant C. One reason that there are different values for C is the fact that one parameter in the calculation of optimum diameter of hole is missing! Let us refer to the wikipedia ...


8

Automotive windshield reflectors can function well as photographic reflectors. The best ones are the shiny silver accordion-fold ones (they often have a "bubble wrap" -like core).


8

Both the official Canon replacement part and many of the third party replacement parts offered on eBay show 3M tape already attached to the back of the replacement grip. I'd follow their lead as others have suggested and use 3M VHB, 3M 300LSE, or 3M 200MP (for other grips on the 550D), as it seems to be what Canon and third party makers use. Or you could ...


8

Most commercial photographers who use smoke a lot buy a commercially made "fog machine" that converts a fluid into dense vapor. The fluid is primarily made of water and glycerin. The machine simply heats the fluid in a semi enclosed space, producing the fog/smoke. You can create such a machine yourself easily. You just need something that can hold the fluid ...


7

If you want to replace the whole grip, sugru is one of the best custom grip/almost anything DIY putty that you can get. It will definitely be able to replace a small grip on a camera


7

Another option to consider is getting one pair of radio triggers and then using an optical device like the Wein Peanut to make the second flash into a slave, if it doesn't already have that capability. I've used this kind of setup to fire extra flashes and stretch my existing wireless trigger capability. Note that if you go with the wired trigger bridged ...


7

Although it's not a DIY, the NEEWER® Macro Ring LED is considered to be cheap (around $30). I tried myself with my extension tube, not bad at all. It provides constant light which is essential if you are too close to the subject. You can mount the power supply for it in your camera's hot shoe, you can use either 4 AA batteries or plug it directly. If you ...


7

F-mount lenses are locked in place by a small metal pin that pulls flush with the lens mount when you press the lens release button. This pin would be in the three-o'clock position when you're looking where the lens mount would be. On auto-focus bodies like your D90, there's a second pin for the focus motor that does the same, and it's at the seven-o'clock ...


7

I would say in terms of order Sony Canon Sony has a repo where you can have access to the operating system, if doing embedded development is your kind of thing. You can access their current repository here. Canon because of the Magic Lantern work and the fact that they do publish some form of API to work with DryOS. If you were a end user who had no ...


7

I have been working on a project which also requires, more or less, a webcam with HD quality (something like 720p) and an optical zoom lens. There are such things for sale ... but they are industrial-strength, and industrial-priced, such as pan-tilt-zoom cameras for high-end videoconferencing equipment. And, of course, there are the commercial cameras that ...


7

A large piece of foam core board (or mat board) is good for portraits. Clamped on a stand opposite of a soft box (key light) just outside of framing. It could be black on one side for absorbing light for more dramatic shadows. Or paint it gold or...?


7

Sadly, you can't, without taking them apart to find out. Unfortunately, it's not reliable to assume anything about the construction of photographic equipment. Even if two instances of what is marketed as the same lens contain optically identical elements, which isn't always guaranteed, you may find that a bevel on the edge of a particular element (or ...


7

As far as I can tell, at least in my two Canon DSLRs you cannot wrap a wire around the battery contacts in the battery compartment. So you could have to implement some sort of connector, for instance by disassembling an old battery(*). You also have to make an outboard receptacle with outgoing wires on which you can insert a camera battery, assuming you ...


7

In addition to what has been said, you cannot be certain that a given camera design can deal with the extra (ohmic or inductive) impedance long wires introduce. The power supply circuit could get rather confused when it experiences a larger than expected voltage drop when attempting to draw a quick current pulse, and could do things like suddenly assume a ...


6

Unfortunately 126 film is no longer made, and even the stocks that were held on to after production ended have for the most part dried up. The good news is that you have another option, and that is to reload the 126 film cartridges with 35mm film. The 126 film was after all, just 35mm film in a more convenient roll that didn't require film leaders or ...


6

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 ...


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