How much light gets through?
This list show the most common color filters along with the percentage of light they transmit.
0 seconds of 4 minutes, 21 secondsVolume 90%
Press shift question mark to access a list of keyboard shortcuts
Keyboard Shortcuts
Play/PauseSPACE
Increase Volume↑
Decrease Volume↓
Seek Forward→
Seek Backward←
Captions On/Offc
Fullscreen/Exit Fullscreenf
Mute/Unmutem
Seek %0-9
| Color filter | Transmission (percent) | Color filter | Transmission (percent) |
| #3 Light Yellow | 88 | #32 Magenta | 13 |
| #8 Yellow | 83 | #38A Dark Blue | 17 |
| #11 Yellow-Green | 40 | #44 Light Blue-Green | 16 |
| #12 Yellow (minus Blue) | 74 | #47 Violet | 03 |
| #15 Deep Yellow | 66 | #56 Light Green | 53 |
| #16 Yellow-Orange | 58 | #58 Green | 24 |
| #21 Orange | 46 | #80A Blue | 28 |
| #22 Deep Orange | 36 | #81A Light Orange | 82 |
| #23A Light Red | 25 | #82A Light Blue | 73 |
| #25 Red | 14 | #85 Amber | 63 |
Expand your observing at Astronomy.com
StarDome
Check out Astronomy.com’s interactive StarDome to see an accurate of your sky. This tool will help you locate this week’s targets.
Intro to the Sky: Get to know the night sky
Learn how to use star charts, find constellations, and observe the brightest objects in your night sky with in this handy reference section.
The Sky this Week
Get a daily digest of celestial events coming soon to a sky near you.
Other Observing Basics videos
