DeltaOptical green filter #56 1.25″
If you have ever observed Mars, Jupiter or Uranus and felt like you were missing something, the right filter might be the answer. The DeltaOptical green filter #56 with a 1.25″ thread is a practical and affordable tool that can significantly improve contrast and bring out specific details on planetary surfaces and in their atmospheres. It suits both beginners who want to get more from their telescope and experienced observers building a set of color filters.
What does the green filter #56 do?
The green filter #56 transmits light in approximately the 500-570 nm wavelength range, which corresponds to the green portion of the visible spectrum. Here is what it helps you see on individual planets:
- Mars - enhances the polar ice caps and atmospheric veils while suppressing the distracting red brightness of the surface
- Jupiter - makes it easier to distinguish details in equatorial belts and to follow the movement of atmospheric features
- Saturn - can improve the visibility of ring structure and cloud detail on the planetary disk
- Venus - helps reduce the overwhelming glare and may reveal atmospheric details
Construction and compatibility
The filter is made from optical glass with a uniform color coating, mounted in a precisely machined metal cell with a standard 1.25″ thread. The thread is compatible with the vast majority of 1.25″ eyepieces available on the market - simply screw the filter onto the bottom of the eyepiece barrel and you are ready to observe. The compact design ensures the filter adds no unnecessary length or weight to the eyepiece, which is especially appreciated when working with shorter focal lengths.
Technical specifications
| Parameter |
Value |
| Filter designation |
#56 green |
| Thread size |
1.25″ |
| Transmitted wavelength range |
approx. 500-570 nm |
| Cell material |
metal |
| Optical element |
optical glass with color coating |
Tips for best results
For optimal performance, we recommend using the filter with telescopes having an objective diameter of at least 80 mm - with a smaller aperture the filter may unnecessarily reduce image brightness. The green filter works best at high magnification and under conditions of good atmospheric stability (seeing). Ideally, pair it with a short focal length eyepiece, for example 5-9 mm, to achieve maximum detail on the planetary disk.
If you are building a filter set, the green #56 complements the red #25, blue #80A and yellow #12 very well for a comprehensive analysis of various planetary details.
Summary
The DeltaOptical green filter #56 is a solid, reliable choice for anyone who wants to take their planetary observing to the next level without a major investment. Just screw it on, point your telescope at your favorite planet and enjoy the details you have been missing.
