"Hi Randy, Thanks for the feedback! The choice for the focal length of your lens really depends on a lot of things. To name a few: - Amount of light in the environment. A bigger zoom usually means that the sensor gets less light. In my application, I…"

"Wow, fantastic work! There are a number of interesting things in that paper, at least for me.  Obviously the calibration process is fantastic and I wish I could free up the time immediately to implement in arducopter.  There are other…"

"@Ruwan: Were you presenting anything flying-related ? @Geoffrey: Thanks for you comment ;)"

"@Adrien- This is very cool and practical! Thank You!"

"I was there @ICRA. Too bad I missed your talk :-("

"For a very informative interview of Oscar Schofield from Rutgers University about the autonomous underwater glider, visit the Robots Podcast: http://www.robotspodcast.com/podcast/2010/02/robots-auv-missions-html/"

"Thanks for the answer Geoffrey ! And what about lateral control ? Here I assume that it's the passive stability of the coax that keeps it roughly in the same position (?). Could you use a similar vision-based technique to control the lateral…"

"Hi Geoffrey,Thanks for sharing! Your work is very interesting. I'm impressed by the stabilization and how it only uses the small vision sensor. No inertial sensor is even required ? I wonder if you have to make assumptions about the environment…"

"Wow, impressive results! How comes I can't see any optics in front of the sensors actually ?"

"Hi Bill, I understand your remarks and it indeed makes sense that the "1 minus the cosine of the angle-of-attack" error should be negligible. Thanks for the clear explanations, Best, Adrien"

"Hi Bill, Thanks for the reply ! "Test flights so far have shown that the compensation works rather well." I have no doubt that the compensation already works rather well, (even without compensation the complementary filter should work in…"

"Hi, Thank you for the interesting algorithm, and for all the detailed information given in the comments ! I think the compensation of the centrifugal force is very promising, and I wanted to understand a little bit better how you implemented it…"