| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "Congrats Nicholas. That effort getting familiar with CHDK can greatly improve your aerial photos. Two notes on your procedure: Your Powershot was..." | Read more » | almost 11 years ago | |||
| cfastie | "I think there are some apps which allow long exposures (Camera FV-5). I guess the calibration photo of the paint would have to use the same settin..." | Read more » | almost 11 years ago | |||
| cfastie | "I don't know what the range of your WiFi setup is, but I guess all you need to find out is a tape measure. Have you been triggering the RX100 with ..." | Read more » | almost 11 years ago | |||
| cfastie | "Marcelo, I thought Kanarinka was brave to put her Sony Nex 5N on a pole, but threatening to put a new US$750 Sony RX100 II on a balloon goes beyond..." | Read more » | almost 11 years ago | |||
| cfastie | "For some reason it's hard to find spectra of glow-in-the-dark pigments. Really, a thousand Public Lab spectrometers out there and no one has done t..." | Read more » | almost 11 years ago | |||
| cfastie | "Would the LED have to be placed outside the entrance slit? Otherwise the grating would form an image of the entire bulb. Standard single color LED..." | Read more » | about 11 years ago | |||
| cfastie | "The Canon A2200 (refurbished) is on sale today (November 21) for $48.99 (free shipping) with a one year warranty: http://shop.usa.canon.com/shop/e..." | Read more » | about 11 years ago | |||
| cfastie | "I guess you're right that taking a spectrum of the sun is not going to allow people in Santa Fe and Beijing to compare their peak heights. Simple ..." | Read more » | about 11 years ago | |||
| cfastie | "Hey these infrablues make really nice multispectral images. I am trying new Photoshop tricks. Below is NIR, NBN, and NDVI. You should have some awe..." | Read more » | about 11 years ago | |||
| cfastie | "I think bouncing a light off the surface of a substance is not going to produce atomic or molecular emission. You have to excite the atoms or molec..." | Read more » | about 11 years ago | |||
| cfastie | "No reason to assume that intensity is constant from 400 to 900 nm, because we apparently know that it is not: So use a curve like this and correc..." | Read more » | about 11 years ago | |||
| cfastie | "There are plenty of open sources of spectral data. Some are listed at this Public Lab wiki. I think the NIST database is a good standard with reaso..." | Read more » | about 11 years ago | |||
| cfastie | "Speaking of fluorescent peaks, I just tried your latest peak detection macro on a spectrum of a fluorescent lamp, then tried your new download macr..." | Read more » | about 11 years ago | |||
| cfastie | "Nathan, Would this procedure require a database of known spectra which included the relative (or absolute) strength of each emission peak or just t..." | Read more » | about 11 years ago | |||
| cfastie | "That's a really original design. 80 grams for the rig is nice. I like the way the Picavet arm serves to protect the camera, and the way the camera ..." | Read more » | about 11 years ago | |||
| cfastie | "Mathew, To make sure there is no confusion, the (NIR-Red)/(NIR+Red) formula is not used for the BG3 filter because there is no red visible channel...." | Read more » | about 11 years ago | |||
| cfastie | "Mathew, That does seem to be a consistent pattern. I think you are right that a green filter might offer the purest visible light channel in a sing..." | Read more » | about 11 years ago | |||
| cfastie | "This is a great map. Congrats on the success and especially on getting out to do a trial run. To sort photos by blurriness, sort the jpegs by fil..." | Read more » | about 11 years ago | |||
| cfastie | "Scott is right that georeferencing obliques is usually not very rewarding. Photosynth can be a solution. You can make a "synth" which aligns the o..." | Read more » | about 11 years ago | |||
| cfastie | "Hi Pat, The Wratten 25A is an old standard photographic filter that is still widely available in glass and gel. I think Ned bought a genuine Kodak ..." | Read more » | about 11 years ago | |||
| cfastie | "The aperture mechanism definitely varies among Powershots. By peering into the front of the lens I learned that the high end ones have an actual ir..." | Read more » | about 11 years ago | |||
| cfastie | "I was assuming that the best way to preserve image quality when removing a glass filter would be to replace it with another glass filter. Plastic, ..." | Read more » | about 11 years ago | |||
| cfastie | "Thanks for suffering through this. I just converted two A2200s, and they are quite straightforward compared to your experience. As far as I can see..." | Read more » | about 11 years ago | |||
| cfastie | "Ned, The NDVI image made from the Rosco 2008 photo by stretching the histograms is surprisingly similar to your calibrated NDVI image from the red ..." | Read more » | about 11 years ago |