Tube MathMagnification and exit pupil
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Exit pupil

Exit pupil mm = aperture mm / magnification, which equals eyepiece focal length / focal ratio.

The resolution form is 116 / aperture mm. It is not a seeing forecast.

Magnification math before eyepiece and camera shopping

Visual mode uses eyepiece focal length; imaging mode uses pixel scale—neither lists gear for you.

Telescope dealers bundle OTA, mount, and eyepiece sets once you confirm target field width and tracking needs. Astrophotography shops sell cooled cameras with matching flattener/reducer kits. Planetarium educators run beginner courses that include safe solar filters—magnification alone does not pick accessories.