Is this your channel?
VLT light path
ESO’s light-path explainer is the sort of diagram that turns “it’s a telescope” into “oh, it’s an entire optical system the size of a building.” If you want to understand how the photons get from sky to instrument without being mangled, this is a good resource.
Buy on Eso
You'll be taken to Eso to complete your purchase.
Pros
- +Clear explanation of complex optical routing
- +Official ESO educational material
Cons
- -Can be technical if you’re new to telescope instrumentation
