71F Flat-Field

Aperture size

71mm

Focal length

490mm

Focal ratio

f/6.9

Objective lens

Quadruplet air-spaced APO(including one ED glass)

Image circle

44mm

Maximum accessory connection (with the focuser fully retreated)

Imaging mode:   
82.5mm (from the base of M48×0.75 male thread）   
100.5mm（from the base of M54×0.75 male thread)

Observing mode:   
111mm（from the end of 1.25" eyepiece holder）   
121mm（from the end of 2" eyepiece holder）

Total length

372.5mm(including 1.25" adapter as dew shield contracted）   
430.9mm(including 1.25" adapter as dew shield fully stretched）   
415mm(including the photographic adapter as dew shield contracted）   
473.4mm(including the photographic adapter as dew shield fully stretched）

Net weight

2.5kg

Gross weight(Including tube ring&dovetail plate）

3.0kg

Rear-end thread type:

M64×0.75-M54×0.75   
M54×0.75-M54×0.75   
M54×0.75-M48×0.75 (with M48×0.75 filter thread)

Standard package items

A 71F OTA， a pair of tube rings, a handle, a Vixen 230mm dovetail plate,

a set of photographic adapters, a 1.25" 45° erecting prism, an 8mm eyepiece, a 20mm eyepiece