Reports and Comments

Reports written in French

Technical matters

Overview of planetarium and other astronomy software

To buy or not to buy from overseas ?, a matter of price and rights

Why stars don't shine at daytime ?, the eye and CCD

Resolutions & agreements about space and astronomy

Files to download (PDFs, tables, reports, sounds, etc )

Optics & Instruments

Celestron 8 Ultima 2000 vs Meade 8 LX200

Overview of some accessories for your scope

How to select an eyepiece ?

Short eyepiece for the Celestron Nexstar 5

Tele Vue zoom 8-24mm 

All about barlow

The best of the best star diagonals

Coating, anti-reflection and dispersion

All you need to know about optical aberrations

Optics quality

How to clean a corrector plate ?

How to correct coma ?

Daystar solar filter and foreign solutions

Useful filters for viewing deep-sky objects, by David Knisely, PAC

Light pollution rejection filters : UHC vs UltraBlock

Pratical formulae