Comments

Author Comment Last activity Moderation
cfastie "Wow, it sounds like you are operating right on the edge of the system's capabilities. That problem is related to streaming video, and for the IRca..." | Read more » about 11 years ago
cfastie "Oh that's right, the photos have to come back from the cameras into the USB ports so it would be hard to share one port. Shutter sync won't be tha..." | Read more » about 11 years ago
cfastie "Tom, I'm glad you asked. The proper Excel expression for choosing the greatest among three values did not come to me quickly, so I just used the eq..." | Read more » about 11 years ago
cfastie "Thanks Mat. The paucity of easily accessible answers to your question suggests that they don't really understand what happens when syrup is made. A..." | Read more » about 11 years ago
cfastie "I guess they plate the stainless steel mesh with gold to keep metallic flavors out of your tea (also used for coffee filters). I noticed it in the ..." | Read more » about 11 years ago
cfastie "That would be very good news if the problem was lens distortion, because that can be corrected with a single click. I will look into that. The imag..." | Read more » about 11 years ago
cfastie "Don and Craig, This is incredible progress. It's really reassuring that Craig is already doing affine registration. It boggles the mind that the ne..." | Read more » about 11 years ago
cfastie "The corduroy appearance of the image is a mystery. The vertical lines are very regular in places, so I assumed they were related to the lines on th..." | Read more » about 11 years ago
cfastie "That sort of worked: https://spectralworkbench.org/analyze/spectrum/4476. I cut out a 50 pixel tall horizontal slice of the Snowy Sky spectrogram ..." | Read more » about 11 years ago
cfastie "Gerhard, The exposure on that spectrum is almost perfect. There was a little too much light at 336 nm, and that peak is flattened a bit. The chann..." | Read more » about 11 years ago
cfastie "Mercury can account for the blue and green peaks, but not the red peaks. So all the tubes (except maybe the red one) have mercury. The red, pink, a..." | Read more » about 11 years ago
cfastie "Hi Spectralod, Your long tube CFL spectrum is calibrated correctly. I am not sure why you are not getting more distinct peaks with regions between ..." | Read more » about 11 years ago
cfastie "The optical diagram for the Spectronic 20 from here. It has two lenses. Below, the optical diagram for the Spectronic 20+ from the official manua..." | Read more » about 11 years ago
cfastie "Well done,Tom. This article which was mentioned at the Google group, discusses the issue of focusing on the spectral image. It even has an equatio..." | Read more » about 11 years ago
cfastie "The Google group is completely separate from this web site, so the two places have somewhat independent conversations. I guess the Google group is ..." | Read more » about 11 years ago
cfastie "Tom, images would be very helpful (so my mind doesn't explode). If you upload images to a site like Flickr or Picasa you can grab the HTML embeddin..." | Read more » about 11 years ago
cfastie "Tom, How did the CFL lines drop off in your earlier spectra? I have noticed that my spectral images taken with P&S and DSLR cameras do not reco..." | Read more » about 11 years ago
cfastie "You tell me. " | Read more » about 11 years ago
cfastie "Stu, Thanks for the lesson! It’s really good to get a feeling for these concepts. I wish you had been my high school teacher. TomH sent me a spre..." | Read more » about 11 years ago
cfastie "Stewart, The KMZ worked great. Nice viewing experience. Changing opacity is key. There is good historical imagery in GE for that area too. " | Read more » about 11 years ago
cfastie "Yes, which suggests that after examining the R, G, and B, spectrographs for a particular spectrum, it might be nice to be able to pick and choose w..." | Read more » about 11 years ago
cfastie "This is really interesting. In theory, or ideally, when you take a digital photo of a diffraction pattern, each pixel on the sensor is being impact..." | Read more » about 11 years ago
cfastie "It's good to know about the stacking process. Thanks for describing this. I wonder whether another way to avoid the averaging of the grayscale ima..." | Read more » about 11 years ago
cfastie "I am glad you raised the question of how the distance to the slit could affect how much the light was bent when it hit the diffraction grating. Thi..." | Read more » about 11 years ago