Well known Paris-based photographer Serge Ramelli  has created a tutorial on how to shoot and process a Photosynth walk in a very low-light environment. And where better to try it out than inside the incredible Notre Dame cathedral in Paris?

Here it is... Thank you Serge!

Here's the first synth Serge ever made. Check out the glorious colors, and the sheen of the cobblestones next to the Seine.

Notre Dame Paris by photoserge on Photosynth

And here's the one he shot inside Notre Dame. Very challenging conditions, especially the very weak light combined with the need to be hand-held. All secrets about how he shot and processed his raw images are revealed in the video above.

Inside Notre Dame 2 by photoserge on Photosynth