Explore Scientific Yellow #12 2″ - planetary filter
If you enjoy observing planets and want to get the most out of your telescope, the Explore Scientific Yellow #12 planetary filter is exactly what you are looking for. This classic yellow filter is a favourite tool among planetary observers around the world - and for good reason. By selectively transmitting light, it can significantly enhance details that would otherwise blend into the background, without the need to invest in more expensive equipment.
How the Yellow #12 filter works
The Yellow #12 filter works by blocking short wavelengths - specifically blue and green light - while transmitting red and orange wavelengths. This selective transmission produces noticeably improved contrast and surface detail on the most popular planetary targets.
Jupiter and Saturn
On Jupiter and Saturn, the filter clearly enhances equatorial belts, storm formations and other atmospheric details that are most visible in these colour channels. The contrast between bright zones and dark belts increases noticeably, which is appreciated by any observer working at medium or higher eyepiece magnification.
Mars
On Mars, the filter brightens red and orange surface areas - deserts and polar caps stand out more prominently - while blue and green areas are suppressed, increasing the overall contrast of the planet. As an added bonus, the filter also helps to detect blue clouds in the Martian atmosphere, since their contrast against the surroundings becomes more apparent when this filter is used.
The Moon
The filter is also suitable for lunar observation, where it reduces glare and improves the visibility of fine surface details.
Construction and optical quality
The Explore Scientific Yellow #12 filter in 2″ size is set in a robust aluminium cell that ensures precise and secure mounting in the eyepiece holder or between the eyepiece and the telescope. The optical surface of the filter features multi-layer coating (multi-coating), which minimises unwanted reflections and guarantees maximum transmission in the selected spectral band. The total weight of the filter is only 11 g, so it adds no burden to the eyepiece or the mount. The filter belongs to the L-RGB filter category and its 2″ thread is compatible with standard eyepieces of this diameter.
Who is this filter for?
The Yellow #12 filter is appreciated by both beginner and advanced planetary observers who want to see more than just the general shape of a planet. It is ideal for telescopes from approximately 80 mm aperture and above - with smaller instruments the effect may not be as pronounced, since the filter slightly reduces the amount of incoming light. Whether used for visual observation or planetary photography (afocal or with a CCD/CMOS camera), it delivers consistent and predictable results. If you regularly observe Jupiter or Saturn, this filter will quickly become a permanent part of your kit.
Technical specifications
| Parameter |
Value |
| Filter type |
Yellow #12 |
| Size |
2″ |
| Thread |
Standard 2″ |
| Filter category |
L-RGB |
| Coating |
Multi-coating |
| Cell material |
Aluminium |
| Weight |
11 g |
| Recommended aperture |
From approx. 80 mm |
| Use |
Visual observation, afocal photography, CCD/CMOS camera |
Summary
The Explore Scientific Yellow #12 2″ filter is a reliable and affordable tool that can visibly improve the quality of your planetary observations. It is not just an accessory - it is a tool that changes what you see through the eyepiece.
