Telescope Eyepieces


Telescope eyepieces:

Eyepiece accessories:


True field of view (TFOV):

Methods of Calculating the TFOV of an eyepiece:

Note: TFOV = True Field of View, AFOV = Apparent Field of View

1: The Apparent FOV Method

2: The Stellar Drift Method

3: The Field Stop Method

4: The Star Chart Method


Using a camera lens as a visual telescope: