ASKAR 71F f/6.9 APO REFRACTOR

Name: ASKAR 71F f/6.9 APO REFRACTOR
Brand: Testar Australia
SKU: AS-71F
Price: 999.0 AUD
Availability: InStock

$999.00 ~~$1,099.00~~

SKU: AS-71F

Askar

Apochromatic Petzval quadruplet

2.5 kg

The Askar 71F is an apochromatic quadruplet flat-field astrograph that offers high performance for an exceptionally low price. The quadruplet design makes it perfect for both visual observation and astrophotography. The objective lens features an element of extra-low dispersion glass (ED) that minimizes chromatic aberration.

The Askar 71F is a versatile instrument and excels not just at imaging, but as a grab & go visual telescope. The included 1.25" erecting prism plus 8mm and 20mm eyepieces make this a great option for landscape and bird viewing. The OTA itself weighs just 2.5kg (3kg with tube rings and dovetail bar) and has an overall length of 372.5mm with the dew shield contracted, making it easy to transport.

Unlike traditional refractors, the quadruplet design does not require a separate field flattener and you do not need to calculate precise backfocus. With a large image circle of 44mm, the Askar 71F is a highly capable imaging telescope.

The 2.4" dual-speed rack & pinion focuser is precise and rigid. It is natively compatible with most motorized focusers on the market including the ZWO EAF. The focuser includes 2" and 1.25" visual adapters as well as M48 and M54 camera adapters. On the rear there is a 360 degree rotator with fine rotation angle markings for precise framing. A 2" mounted filter can be attached to the rear M48 camera adapter.

Unlike most refractors, the 71F includes two finderscope bases on either side of the focuser, allowing you to attach both a standard guide scope and control unit such as the ASIAIR without the need for additional accessories. The handlebar also includes a finder-style slot, allowing for even more possibilities.

The inner surfaces of the retractable dew shield are covered with matte felt and the interior of the telescope tube has matte paint and internal baffles, to reduce internal reflections and light scattering.

Note: the mount shown in the product images is not included with the telescope.

Specifications

Optical design	Apochromatic air-spaced quadruplet with ED glass
Objective diameter	71 mm
Focal length	490 mm
Focal ratio	f/6.9
Resolving power	1.63 arc second
Stellar limiting magnitude	11.96
Max. magnification	177.5 x
Light gathering power	102.88 times the human eye
Mount attachment	230 mm Vixen-style dovetail with 1/4"-20 & 3/8" screw holes
Focuser	2.4" rack & pinion dual speed 1:10
Tube weight	2.5 kg (3.0 kg with dovetail and rings)
Tube length	372.5 mm (473.4 mm with dew shield extended and photographic adapters)
Tube diameter	78 mm
Dew shield diameter	88 mm
Connections	2", 1.25", M64 x 0.75, M54 x 0.75, M48 x 0.75
Focus point (imaging mode)	82.5 mm from M48 thread, 100.5 mm from M54 thread
Focus point (visual mode)	117 mm from 1.25" adapter, 127 mm from 2" adapter
SKU	AS-71F