Retired more than 17 years ago, I live part in Jerusalem, Israël and part in France.

I have participated to the beginning of the webcam adventure in astronomy, a time (~year 2000) where we were modifying all the Philips ToUCams we could put a hand on.

Today, my main interest is the Sun (at full Sun resolution in many wavelenths like H-alpha, Helium D3, CaK CaH, etc... with the Sol'ex, in high resolution in H-alpha with a Quark Chromosphere, a Coronado SM90 BF30, a even a double-stack PST & 2.2x enhanced PST).
I am also equipped and interested by:
- ISS Hires tracking (C8 Edge and recently 125x Coolpix P1000)... I use a dedicated modified EQ-G mount and Videos Sky software, both developped by Emmanuel Rietsch !
- Planetary imaging with a Meade 12" LX-200 GPS and 10" Classic,
- The Moon with the Coolpix P1000,
- 3D stereoscopic imaging especially landscapes, birds, insects (macros),
- Near infrared (NIR) including 2x A7s MK1 with one Halpha defiltered,
- Thermal infrared (TIR) at medium resolution,
- UV nature photography (using a full spectrum Canon EOS 1100D),.
- High Speed photography up to 1000 FPS producing slow motion movies with different cameras and base values, at best a stereo rig of 2 RX10 IV (up to 600 mm zoom !),
- Lightnings photography ...

To see some result of so many activities, I recommend having a visit to my YouTube channel https://www.youtube.com/user/sweillerYT and for ,the Sun, having a look at spaceweather after spectacular events....

I am day after day grateful to the authors of FireCapture, SharpCap, RegiStax5&6, Autostakkert!3, AstroSurface, PIPP, VirtualDub, GIMP2,
Deepskystacker, SER-Player & PIPP, Inti, JSolex, WEB site tutorials, etc ...
They are some of the best amateur astronomy tools !

With Gilbert Grillot we develop some utilities in Delphi ! Recently ChatGPT has enabled us to do it faster !

Long time ago, I was most active in RegiStax5/6 development, a bit in SER-Player and was a member of the SCF (french 3D stereo club). Even my imagery of the Sun has led by chance to scientific publications ...

Best

Sylvain