Astronomik ProPlanet 642 BP 1.25" (M28.5)
Key specifications
| Filter type | Other |
|---|---|
| Passband | 642-840nm (IR bandpass) |
| Filter size | 1.25" |
| Mounted | Yes |
About
An infrared bandpass filter opening at 642 nm and closing at about 842 nm — unlike the other ProPlanet filters it blocks the longer IR. Astronomik pitches it as three filters in one: daylight IR photography, seeing-reduced lunar and planetary imaging, and an affordable entry to H-alpha deep-sky work, since it reaches nearly full transmission at 656 nm. 1.25" M28.5 mount.