Alley in Pisa, Italy

by Lars Kotthoff

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14

Gray cards are super cheap (e.g., $2.49) - I wouldn't bother. :)


14

Are there other techniques or devices that could help? Another technique is stacking multiple short exposures. Pick a moonless night away from city lights. Take many short 20-30 second exposures of the sky. Use something like Hugin to align them. Load them into Photoshop (or Gimp) layers and blend them together. There looks to be a good write up ...


13

The first thing that comes to my mind is convert it to infrared. That way, you can take pictures unlike what your other cameras can get with it, returning it, potentially, to a place of prominence in your camera line-up. (Many more pages about this exist. I picked one that seemed DIY and P&S oriented, but it may well behoove you to find one specific to ...


13

I would pick up the Strobist Rosco collection, $12 gets you 55 gels. You aren't going to be able to handcraft 55 different filters out of things you can find at an office supply store. If you really want to make them yourself, head on over to instructables.com and read this tutorial.


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

There are some DIY options out there, and not all that hard to make if you're willing to spend some time and have attention to detail. The simplest forms are the "barn door" mounts which are basically two pieces of hinged wood with a screw that it is turned on an interval to compensate for the Earth's motion. Anyways, Catching the Light has a writeup of all ...


11

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 ...


10

I've done my own conversion on a Nikon D80, including cutting my own rectangular filter from a hoya 720 nm 77 mm round filter. I did something a bit unusual and went so far as to remove the IR filter from the AF sensor module and meters, as well as the CCD itself. Really, The pure CCD filter swap is pretty easy. Pulling the filter on the metering sensor ...


9

Ah my knowledge of the ridiculous and obscure may come in handy! You want ISO 13450 (1996), which has all the juicy details on 110 film (size/shape of the cartridge, exposure area, speeds, etc.). Sadly I'm not sure where you can get a copy without forking over the Swiss Francs to the ISO folks - Perhaps someone else has a hook-up though. Perhaps also ...


8

Spot-meter the palm of your hand (be sure it's lit appropriately, however). Seriously. It, or a Caucasian face, will meter about 1 stop brighter than you need, which means it's easy to compensate for.


8

Hooking up a raw sensor is a monumental task (for a CMOS sensor, you typically have at roughly one line for each row/column, meaning ~3k x 4K connections stuffed into less than an inch on each side). A typical netbook, cell phone, etc., uses a packaged camera module with some sort of serial connection to the outside world. You can get some primarily video ...


8

I had a Rebel XSi converted by ProTech in the UK, and could recommend their services. I went for a 720nm IR pass filter so I don't need anything on the lens. I'd recommend this wavelength for your first IR camera as you can produce both colour and contrasty B&W images: It's not that difficult a procedure actually, Lifepixel sell kits for people to ...


8

Consider a 2D cross section ABCD straight through a cell of the grid, parallel to (and containing) the lighting axis. AD = BC is the depth of the cell and AB = CD is the length of the opening (horizontally, vertically, or even at an angle). In this diagram light can come anywhere from the left in any direction (created by your softbox or otherwise). 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: ...


8

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. ^^ ...


7

At its simplest... stick this thing from Ikea on your light and fire away. I have no idea how well it actually works. However, it's probably quick and cheap enough that you could try it on a lark. If you want to take a step up, DIYPhotography has a bunch of articles on exactly this topic. I myself have made a PVC-and-cotton light tent along these lines. ...


7

From what I understand about Expodisc, it is a rather carefully engineered filter. It is designed to transmit a diffuse 18% of visible light, corresponding to a standard 18% gray card. Unless you have a way to precisely measure the light passing through materials that can be found at the likes of Home Depot, and can ensure that the resulting light is ...


7

I would suggest trying it yourself, especially if you are mechanically minded and have had success at other small part disassemble/reassemble jobs. If you do decide to give it a go, I am an electronic engineer by trade and here are some suggestions that I use when I have to repair small electronic devices ... Have a LARGE clean, clear, flat and preferably ...


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

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'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 ...


6

Well, if had an old point and shoot hanging around, I'd probably give camera tossing a go. You can get some interesting shots doing this. Alternately you could leash the carry strap and whirl it around. This is more fun if the camera has a built in intervalometer for taking snaps on time intervals. Anyways, marked my answer community wiki in anticipation of ...


6

Unless you have the technical prowess, the time, and yes...the money (as it would still be expensive) to build your own tracking mount, you probably won't be able to do long-exposure astrophotography. You can avoid star trails, and do "short-exposure astrophotography" by using three things: Very short focal lengths, very fast lenses, and very high ISO. You ...


6

Assuming square grid bins, the dimensions of each grid bin are WxWxD, where D is the depth of the grid and W is the square edge length. Then, using trigonometry, we know that: tan(A) = W / D where A is the beam angle (from center line - axis - to one side). But, when considering rays passing through the square corners, there are two more angles to ...



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