Inspired by a previous revision of one of the articles on the Kerbal Space Program wiki:
How would one plausibly have telescopes and/or cameras be present on an inhabited, civilised planet since antiquity?
For the purposes of this question, "antiquity" is defined as "a timeframe where the most advanced civilisation on the planet is at approximately Classical Greece-level [~400 B.C.E.-equivalent] or earlier".
"Camera" here refers to a device that can take pictures of something and store the pictures (or the precursors thereof) for later viewing - a camera obscura does not count.
Indigenous development would be preferable if at all possible, rather than having technology be left behind by visitors from a more advanced planet.
I'm guessing that telescopes would probably be the easier of the two, as the most advanced technology required to produce them is the ability to grind glass into the right shapes for curved lenses and/or mirrors, whereas building a camera requires some fairly advanced photochemistry and plain chemistry in order to be able to record an image on a light-sensitive film or plate and then have the resulting image not be destroyed when brought into an illuminated area for viewing. (I'm presuming that digital cameras would require a considerably more advanced level of technology than film or plate cameras; please feel free to correct me if I'm wrong in thinking that.)