The FirstScope comes with two eyepieces: A 20mm Huygens giving 15x and a 4mm Ramsden (“SR”) giving 75x.

The 20mm Huygens…. functions. The apparent field of view is extremely narrow (30 degrees), and the view is fuzzier than it already would be with a good eyepiece in the FirstScope. The Huygens design adds some chromatic aberration (something one should never see in a Newtonian) and the edge of the field of view contains aberrations I don’t even know how to describe.

The 4mm Ramsden is useless, being the same hated eyepiece supplied with Celestron’s Powerseeker line. It provides too much power for the scope (75x), the eye lens is tiny, it has zero eye relief, it doesn’t perform well with a fast focal ratio telescope like the FirstScope, and the field is slightly narrower than the 20mm Huygens. It also has an annoying tendency to get stuck in the focuser, the solution to which is to turn the scope upside down, loosen the screws, and shake it – preferably while above a garbage can, where it belongs.

You can buy an “accessory kit” for the FirstScope. All the kit contains is some more garbage Huygenian eyepieces, a useless 5×24 finderscope, and a cheap Moon filter which you plain don’t need and doesn’t work well anyways.

Celestron offers a “Cometron” variant of the FirstScope which is exactly the same, except with passable Kellner eyepieces and the same godawful 5×24 finderscope attached. If that’s all you can afford I would recommend it over the base FirstScope, but really I would strongly caution you about both.