I wouldn't say a Dwemer technology, I mean the people of Tamriel can construct lighthouses, so constructing a telescope would be hard for them to do.
Light houses were in use for a long, long, long time without any sort of lens. All you need is fire on an elevated platform. If you want to get fancy, put a reflector behind it to stop so much of the light going off into the sky above or the land - no need to focus the light in any way to do that.
Anyhow, on PC you can simulate a telescope (or microscope, or just focusing your attention) by using the FOV console command with a rather low numbers (10-25) as the parameter. Sorry if that doesn't work for you ... but then, DLC or mod would also likely not work for you, so...