Askar 130PHQ 130 mm F/7.7 Quadruplet

Codice articolo: AS130PHQ

This long focal ratio flatfield apochromat support 60 mm image circle and does not need calculations for backfocus. If the image is sharp, the field is flat

♦ 130 mm aperture, 1000 mm focal length, f/7.7

♦ Petzval like, self flattening design with two ED elements

♦ 3.4" dual speed focuser

♦ 2" and 1.25" receptacles, M68, M54 and M48 threads

♦ Retractable dew shield

♦ Losmandy style dovetail bar

♦ Handle

♦ Vixen type finder base

Askar 130PHQ Quadruplet APO Astrograph
130PHQ is a long-focal-ratio, flatfield astrograph newly launched after 107PHQ. Instead of buying extra flatteners, calculating the backfocus of flattener or making tedious connection to match the distance, astrophotographers can simply equip it with any possible imaging devices, make the target stay at the focus, and then the whole optical system is perfect for imaging.

High quality imaging optics:
130PHQ has a larger size than 107PHQ, with an aperture 23 mm larger than 107PHQ. 130PHQ has a focal ratio of f/7.7 which is longer than 107PHQ' s f/7, and a focal length of 1000 mm. The Petzval-like quadruplet lens with two ED glasses offers excellent control of chromatic and other aberrations. With its self-flattening design, 130PHQ offers strong advantages in astronomical shooting. It supports a medium frame 60 mm image circle, has a fine spot diagram with tiny distortion of the peripheral stars, and its central RMS radius is less than 2 microns.

The Askar 130PHQ is a true all-rounder with f/7.7 - it is designed as telescope for almost all applications:
♦ With 1000 mm focal length and the large corrected field of view, extended objects can be imaged. But equally, fine details of objects can be brought out when cameras with high resolution are used.
♦ The use of different cameras with different flange focal lengths is no problem. Simply focus and you are always at the correct distance. The adapter battle is eliminated.
♦ The focuser has large travel, so you can find the focus without problems.
♦ The working distance or backfocus from the 2" receptacle is long enough to use 2" star diagonals. This turns the flatfield apo into a wide field telescope or even a planetary telescope, depending on the eyepiece used.

Practical features:
130PHQ comes with a telescopic lens hood, a high quality CNC machined and painted tube and attractive decorative parts. The 3.4" rigid focuser comes with M68, M54, and M48 adapters and a finder base. When used with the optional 3" 0.7 x flat field reducer, the telescope can reach a focal ratio of f/5.4 and a focal length of 700 mm, effectively reducing exposure time. The multifunctional handle comes with a central slot for attaching an M6 screw with an M6 screw hole. Standard Losmandy dovetail plate, together with sturdy double tube ring, is perfectly suited for viewing and shooting.

The photographic 3.4" rack&pinion focuser deserves a special note:
The CNC focuser is optimized for photography and can handle a load of up to 8 kg. The adjustment range is very generous. The focusing is done via rack and pinion which is decoupled from the bearing of the draw tube. This guarantees fine and precise adjustment even at maximum load. In addition to the 1.25" and 2" receptacle, the focuser also offers threads for screw adaptations.

Aperture size: 130 mm
Focal length: 1000 mm
Focal ratio: f/7.7
Objective lens: Air-spaced quadruplet apo, consisting of a triplet (including two ED glasses) and a single element
Image circle: 60 mm
Eyepiece connections: 2", 1.25"
Focuser: 3.4" dual-speed rack and pinion, max. load 8 kg
Focuser travel: 95 mm
Visual back-focus with focuser fully retreated: 148.5 mm (from the end of 2" eyepiece holder)
Rear-end threads: M86x1 male, M68×1 male, M54×0.75 male, M48×0.75 male
Rear-end filter adapter: M54×0.75-M48×0.75 (M48×0.75 filter thread inside)
Photographic back-focus from base with focuser fully retreated: 186 mm (from M86×1 thread), 156 mm (from M68×1 thread), 136 mm (from M54×0.75 thread), 116 mm (from M48×0.75 thread)
Dew shield diameter: 169 mm front, 162 mm back
Tube diameter: 146 mm
Total length with 1.25" receptacle: 842.5 mm / 889.5 mm (dew shield retracted / fully stretched)
Total length with 4-piece adapter: 1011.5 mm / 1061.5 mm (dew shield retracted / fully stretched)
Finder base: Vixen finder shoe
Mount connection: Losmandy style dovetail plate
Net weight: 10.2 kg
Gross weight: 12.5 kg