FOV and Magnification for a Variety
of Eyepieces with Various Equipment

eyepiece Orion XT8, 8" (203mm) Orion Argonaut, 6" (152mm) Takahashi FS-102, 4" (102mm) Meade SDE 10" (254mm) Obsession, 25" (635mm)
    focal length, mm apparent field, degrees 1218mm f/6 1800mm f/12 820mm f/8 612mm f/6 1143mm f/4.5 3175mm f/5
TeleVue

mfgr

Panoptic

type

FOV, degrees mag FOV, degrees mag FOV, degrees mag FOV, degrees mag FOV, degrees mag FOV, degrees mag