this is a offer about a used ST 90 in good condition.
BF blocking filter: The deflection optics with the eyepiece receiver also accommodate the blocking filter. This filter reduces the brightness of the solar image and is therefore a very important part of the solar telescope, and which must under no circumstances be removed! For purely visual observing, a small blocking filter is sufficient, but for photography a larger one should be selected.
Sol Ranger: Pointing a telescope at the sun is more difficult than you may think and can often involve involuntary glimpses of the sun with unprotected eyes! The Sol Ranger finder scope is a special solar finder that uses a ground glass screen. This allows you to point your telescope at the sun easily, safely and quickly.
Delivery includes no Cemax eyepiece.
Scope of Delivery:
- Telescope SolarMax II 90 DS / BF15
- Mounting ring (but no dovetail bar)
- Sol Ranger solar finder
- Carry case
Products specifications
| Type of telescope | H-Alpha Solar Telescope with integrated Etalon |
| Viewfinder | Solar Finder |
| Band Pass | Combined 0.5Ä |
| Blocking Filter | d=15mm (Diagonal) |
| Connection to eyepiece | 2"/1.25" |
| Aperture | 90mm |
| Focal length | 800mm |
| Focal ratio | f8.9 |
| Weight | 10,4 Kg |
