Farpoint Carey Focus Mask - 2.5 Inch to 4.5 Inch TelescopesFarpoint Carey Focus Mask 2. 5 Inch to 4. 5 Inch Telescopes is an ingenious new way to easily focus a telescope. Fits telescopes with dew shield or tube from 2. 5 to 4. 5 in diameter. Farpoint Carey Focus Mask 2. 5 Inch to 4. 5 Inch Telescopes Farpoint Carey Focus Mask 2. 5 Inch to 4. 5 Inch Telescopes is an ingenious new way to easily focus a telescope. George Carey, an amateur telescope maker and astronomer from the UK, published a modification of