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© Ciel Extrême, 1998
Illustrated Articles
 

© copyright/authors rights = how to use the material exposed on this site with full honesty

!!! new !!!
MIRROR CLEANING
A way to safely wash your telescope mirror without even touching it !.
MAGNITUDE LIMITS ON POLARIS
Some rejuvenated data to allow for better rating estimates of night sky transparency with the naked eye: a selected Polaris area with visual magnitudes from Tycho/Hipparchos data (charts by Guide7).
DRAWING THE DEEP SKY
No need to bear Picasso's name to use a pencil in order to draw the deep sky ! You can learn the bases and find tricks to record cheaply your deep sky observations... 
VIRTUAL APERTURE
For the same diameter, which instrument to choose ? A Schmidt-Cassegrain, a refractor, a classical Newton or why not a Maksutov ? In this article, you will find a way to compare performances of all instruments destined to deep sky observing. 
NEWTONIAN COLLIMATION
You never obtain sharp images and don't know how to check your instrument collimation. Here are the detailed explanation of optical chekings and adjustments (collimation) that you can apply to your Newtonian, whatever its aperture.