| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| stoft | "Since you appear to have verified all the individual elements, the solution must be that your overhead "fluorescent" ceiling lights are not the typ..." | Read more » | almost 9 years ago | |||
| stoft | "Ok, still a mystery; but I'll bet it's something simple that's overlooked. Let's double-check the obvious. In room light, the webcam by itself shou..." | Read more » | almost 9 years ago | |||
| stoft | "Ok, it was just a reflection in the earlier photo. Just good to check. Could there be any issue with the DVD as a diffraction grating having been a..." | Read more » | almost 9 years ago | |||
| stoft | "Quick question .... in your photo above (of the 0.4mm slit) it looks like there is a gap between the slit film and the paper holder for that film. ..." | Read more » | almost 9 years ago | |||
| stoft | "Hmmm. Well, I'd agree the above image seems "fuzzy" but I'm also not clear as to what light the spectrum is representing. It also looks very over-e..." | Read more » | almost 9 years ago | |||
| stoft | "Jeff, Yes, you could double the slit width and double the exposure but you also significantly decrease the resolution. That said, I've noticed that..." | Read more » | over 10 years ago | |||
| stoft | "Yes, I could print a couple sheets but it would be best to decide on the best pattern and density if you're looking to send something along the lin..." | Read more » | over 11 years ago | |||
| stoft | "Yes, I ink-jet printed on 'Grafix' transparency film (not the adhesive version)-- it's available on-line via Amazon. It's reasonably stiff in small..." | Read more » | over 11 years ago | |||
| stoft | "I see your point. I just wonder about having only a single attenuation step which could make it difficult to find the best level; a case of too lit..." | Read more » | over 11 years ago | |||
| stoft | "Ok, interesting idea. The extension to this is a continuously variable attenuator and let the detection algorithm pick the line w/max signal but w/..." | Read more » | over 11 years ago | |||
| stoft | "I'd agree that giving more visibility the the clipping issue would be good and this is a simple, cheap tool. However, I don't quite follow your 2-s..." | Read more » | over 11 years ago | |||
| stoft | "Stu, thanks. Yes, there's still much to be understood about the performance limitations. Jeff, the app is in matlab though it could probably be co..." | Read more » | over 11 years ago | |||
| stoft | "Jeff, Thanks. I've just posted an addendum at the end of this research note to add some plots specifically looking for linearity. I believe the ima..." | Read more » | over 11 years ago | |||
| stoft | "Yes, a large DOF can mean a less precise focus adjustment requirement, but near "infinity" the webcam just seemed out of focus over a wide DOF. Tha..." | Read more » | over 11 years ago |