The landlord wanted to buy a refractor, and I agreed. It is a waste for novices to turn around, and reflection and coating are also annoying. So I personally recommend refraction.
The landlord wants to buy a telescope, as long as he cares about two things-caliber and equatorial telescope.
Nothing else is valuable. If the landlord buys it in the store and haggles hard, he can get at least a 60% discount.