Ein einfaches Verfahren zur Bestimmung der Reflektivität von Cassegrain Teleskopen
A method is described for measuring the amount and quality of a Cassegrain telescope's reflectivity. A comparison is made between direct skylight and light measured after double reflection in the telescope. The difference is then measured by removing the sky baffle and taking filter photographs of the spectrum at various exposure times through the hole bored in the primary mirror.
Mitteilungen der Astronomischen Gesellschaft Hamburg
- Pub Date:
- Cassegrain Optics;
- Optical Measurement;
- Astronomical Photography;
- Optical Filters;