SVBONY SV139 1.25"ND(4/8/16/1000) Neutral Density Moon Filter Kits for Telescope

Description

Features:
The 1.25" Neutral Density Moon filter reduces glare so you can see more lunar detail and surface features with your telescope
Metal filter cell threads directly into the 1.25 inch barrel of your telescope eyepiece
Useful for different caliber astronomical telescopes through which the light of the Moon can be extremely overwhelming
Perfectly neutral color will not alter the natural color of the Moon
Specifications:
Brand: SVBONY
Model: SV139
Type: Neutral Density Filter Kit
Material: Optical glass lens, Aluminum Frame
Barrel diameter: 1.25''
Optical density value: 0.6 0.9 1.2 3.0
Thread: Standard M28.5*0.6mm
Net Weight of Set: 20g
Universal Science:
Waxing Crescent Moon - As the Moon moves around the Earth, we get to see more and more of the illuminated half, and we say the Moon is waxing. At first we get a sliver of it, which grows as days go by. This phase is called the crescent moon. It's very good effectto use the ND4 filter at this time
Last Quarter Moon - Three weeks after new, we again can see half of the illuminated part. This is usually called last quarter. Quarter Moon - A week after the new moon, when the Moon has completed about a quarter of its turn around the Earth, we can see half of the illuminated part; that is, a quarter of the Moon. This is the first quarter phase. It's very good effect to use the ND8 filter In this two time period
Gibbous Moon - From now on, until it becomes new again, the illuminated part of the Moon that we can see decreases, and we say it's waning. The first week after full, it is called waning gibbous. It's very good effect to use the ND16 filter at this time
Full Moon - Two weeks after the new moon, the moon is now halfway through its revolution, and now the illuminated half coincides with the one facing the Earth, so that we can see a full disk: we have a full moon. It's very good effect to use the ND1000 filter at this time
Package Includes（ND4）
1.25" ND4 Filter
Sturdy Plastic Case
Package Includes（
ND8
）
1.25" ND8 Filter
Sturdy Plastic Case
Package Includes（
ND16
）
1.25" ND16 Filter
Sturdy Plastic Case
Package Includes（
ND1000
）
1.25" ND1000 Filter
Sturdy Plastic Case
about svbony