Specifications; Telescope Specifications; Threads Specifications - SKY-WATCHER ESPRIT 80 ED Super APO Instruction Manual

Telescope specifications

Optical Design
Field Flattener
Aperture (mm)
Focal Length
Focal Ratio
Finderscope
Diagonal
Dovetail
Highest Useful Magnification
Lowest Useful Magnification
Limiting Stellar Magnitude
Resolution (Rayleigh)
Resolution (Dawes)
Light Gathering Power (Compared to Human Eye)
Optical Coatings
Fully Illuminated Field With Field Flattener
Optical Tube Length
Optical Tube Weight
Telescope Visual Backfocus
Field Flattener Backfocus

Threads specifications

Rings/
Threads
Ø
In
In screw depth
Ø
Out
Out screw depth
∗
The visual back focus of the telescope is the distance from the end of the focuser tube (with 2'' adapter
installed) to the focal plane. This means, all accessories needing 160mm back focus or less can be installed.
**
The back focus of the field flattener is the distance from the back of the field flattener to the focal plane.

Specifications

∗
**
Focuser Drawtube
Tube Adaptor
n/a M74x1 F.
n/a 7 mm
M74 x1 M M65x1 M.
6 mm 6 mm
Refractor (air-spaced triplet APO)
Thread-on (2 lenses)
80 mm (3.15 in)
400 mm (15.75 in)
5
9x50, erect-image, right-angle
2" dielectric coatings
EQ5(Vixen style) dovetail plate
180 x
11 x
11.6
1.74 arc seconds
1.45 arc seconds
131 x
Fully multi-coated
33 mm (1.3 in)
44.6 cm (17.6 in)
4.05 kg (9 lbs)
> 160mm (6.3 in)
61mm (2.4 in)
Field
Flattener
M65x1 F.
8 mm
M66x1 M.
5 mm
11
DSLR Enlarged
Ext. Tube T-Ring
M66x1 F. M48x0.75 F.
6 mm variable
M48x0.75 M Camera
5.9 mm n/a