| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "I think the Public Lab Store will ship filters to Europe: https://store.publiclab.org/collections/diy-infrared-photography/products/infragram-diy-f..." | Read more » | over 8 years ago | |||
| GFFchris | "Hello, I wanted to ask if anyone has an idea on how to order the Rosco filter to Europe / Germany? Many Thanks! " | Read more » | over 8 years ago | |||
| cfastie | "The angle from which the photo is taken and the angle of the sun do influence the NDVI result. NDVI values are a function of how much red and NIR l..." | Read more » | almost 9 years ago | |||
| kykytos | "Is it important the station in which the photo is taken? I mean, how do you differ infrared reflected radiation from infrared emitted radiation (th..." | Read more » | almost 9 years ago | |||
| cfastie | "Bob, this is a great idea. A secret admirer sent me one of these and I was very excited. I didn't know that any mortal could order them for only $3..." | Read more » | about 9 years ago | |||
| bobmathieson | "anyone tried the Rosco sample book... only $3.95 from adorama. The swatches will not be big enough for front lens filters on SLRs but easily big en..." | Read more » | about 9 years ago | |||
| aguchosolano | "Thanks! " | Read more » | over 9 years ago | |||
| natalie | "Yes that's correct. We have about 100 of the Infrablu filters left. After those are gone, all the new Infragrams have one each of #74, and #19. " | Read more » | over 9 years ago | |||
| warren | "Hi, aguchosolano - the Public Lab store ships internationally and will send Rosco #74 or #2007. I believe they're going to start shipping #19 as we..." | Read more » | over 9 years ago | |||
| aguchosolano | "Thanks cfastie! I am from Argentina, so I will try to contact providers that could send the filters to my country. " | Read more » | over 9 years ago | |||
| cfastie | "Theatrical gels are a good substitute for more precise filters. Rosco #19 "Fire" behaves much like Wratten 25A and costs $7.00 for a huge (20x24") ..." | Read more » | over 9 years ago | |||
| aguchosolano | "Hello! Is there any "easy to find" material that I could use to take some pictures and calculate the NDVI? I mean, before buying expensive filters ..." | Read more » | over 9 years ago | |||
| cfastie | "@camilochiang, Yes, you are correct that with a blue Rosco filter, the photo captured by the converted camera is (more or less) NGB. I think the di..." | Read more » | over 9 years ago | |||
| camilochiang | "Hi cfastie! I really think that your work is pretty awesome and for that im trying to do some experiments with the NoIR camara and your "Rosco filt..." | Read more » | over 9 years ago | |||
| cfastie | "kykytos, This is a really good question. Lots of blue light can pass through a #2007 filter, so a white light viewed through the filter will appear..." | Read more » | over 10 years ago | |||
| kykytos | "Hi, I don't understand how can be blue color the Rosco #2007 VS Blue filter when it allows blue light to pass. We see the color of the objects beca..." | Read more » | over 10 years ago | |||
| warren | "Well, a common way to do hyperspectral is to just collect a whole row of spectra (y dimension is your row of pixels, x dimension is wavelength) and..." | Read more » | over 10 years ago | |||
| Bob | "... and I always run to grab my regular camera when I see a Sphinx moth flying in the yard! " | Read more » | over 10 years ago | |||
| cfastie | "I haven't wrapped my head around how to make a DIY hyperspectral image. I guess the idea is to make a photo of an object by capturing only a very n..." | Read more » | over 10 years ago | |||
| warren | "Have you attempted to do dual-camera red/IR photos? Or even just a regular visible-light photograph of the same worm to get the red channel? What ..." | Read more » | over 10 years ago | |||
| cfastie | "The lack of differentiation really surprised me. The fact that hornworms fed a leaf-free diet turn blue is consistent with the idea that ß-carotene..." | Read more » | over 10 years ago | |||
| warren | "Time to begin scanning them with a spectrometer! Don't you think there ought to be more differentiation there? " | Read more » | over 10 years ago | |||
| warren | "BTW, this post is now the 7th most popular research note (by view count) on the site! " | Read more » | almost 11 years ago | |||
| cfastie | "Hi jalarid, Yes that is correct. There is lots of active development about which cameras and filters work best, and how to get the most meaningful ..." | Read more » | almost 11 years ago |