| 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 | "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 | "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 | "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 |