AstronomikB

Blue component of a color image. This blue filter is very transparent and easy to use. In a general way a blue filter images higher atmospheric layers on planets.

- Getting the blue component of a color image
- Good quantity of light available
- Basis filter for imaging high atmospheric layers

- Sensitive to seeing effects and to sky transparency
- Wavelenghts easily scattered by the atmosphere, resulting in a loss of contrast and resolution

Jupiter 21 august 2010 - Cassegrain 250 - SKYnyx 2-0M Higher layers of visible clouds. Belts are dark, zones are bright (except for this 2006 image where the EZ presents a yellow coloration phase). In this color, dark spots are at the most contrasted (like the NEB barges).
Saturn 17 april 2006 - Mewlon 210, Lumenera LU075M Visibility again of higher clouds on the globe. The globe is slightly dark, in coherence with the yellow color of the planet.
Mars 13 october 2005 - Mewlon 210, Lumenera LU075M Main tool for the study of atmospheric phenomena on Mars, the B filter is essential to the observation of the planet. If violet or UV filter are more efficient, it can be used more easily. In these wavelenghts, the surface is dark (although details are still perceptible), and white clouds are bright, as any iced surface (like the polar caps)..
Vénus 3 may 2007 - Cassegrain 250 - SKYnyx 2-0M Blue details on Venus are the same as the UV and W47, however the contrast is markedly reduced. The filter is not really interesting for Venus imaging, except for making true-color RGB images ; in that case the details of the upper atmosphere show up in their true color as yellowish patches.