Askar 107PHQ f/7 Quadruplet APO

A 107mm Quadruplet APO with Two ED Elements

The 107PHQ is built around a quadruplet air-spaced apochromatic objective lens system. This four-element design includes two pieces of extra-low dispersion (ED) glass, which better reduce chromatic aberration.

It achieves excellent color correction even at magnifications up to 300x in visual observation, with a central RMS radius of 3um.

A Flat 44mm Image Circle, No Flattener Needed

The 107PHQ has a built-in flatfield lens and supports 44mm full-frame imaging. The stars around the corners seldom suffer from distortion or deformation, and it effectively handles field curvature and vignetting.

There is no separate flattener to buy and no back focus to calculate: attach any imaging accessory directly and, once focused, it is ready for shooting.

749mm Focal Length at f/7 for Detailed Imaging

At 749mm a full-frame sensor covers about 2.8 x 1.8 degrees: enough for the Triangulum Galaxy (M33) or the core of the North American Nebula (NGC 7000), and the bright body of the Andromeda Galaxy (M31).

Askar adds that with a high-resolution camera it brings out a lot of detail in the target.

A 3.4-inch Rack-and-Pinion Focuser with 8kg Capacity

The Askar 107PHQ has a 3.4-inch rigid rack-and-pinion focuser that can handle a load of 8kg and is optimized especially for astrophotography.

• 1:10 Fine Adjustment: For precise focus.
• 95mm Focuser Travel: The long 95mm travel suits visual observation.

M86 Down to M48: A Complete Imaging Adapter Set

The 107PHQ includes a four-piece M86-M48 photographic adapter set. Askar measures connection distances from the base of the M86x1 male thread.

The included adapters step this down to common astronomy sizes:

• M86×1 to M68×1: Up to 119mm from the base of the M68x1 male thread.
• M68×1 to M54×0.75: Up to 99mm from the base of the M54x0.75 male thread.
• M54×0.75 to M52×0.75: The third step.
• M52×0.75 to M48×0.75: Up to 79mm from the base of the M48x0.75 male thread, with an M48×0.75 filter thread.

Optional 0.7x Reducer

For imagers seeking a wider field of view and faster imaging times, Askar makes an optional 3-inch 0.7x full-frame reducer for the 107PHQ, 130PHQ and 151PHQ, a triplet with one ED glass.

It shortens exposure time and increases the field of view. It supports a 44mm image circle, has a standard 55mm back focus and an 80mm maximum outer diameter, and comes with M68, M54 and M48 thread adapters.

A 6.9kg Platform with a 300mm Vixen Plate

The Askar 107PHQ weighs 5.7kg for the optical tube alone and 6.9kg fully equipped with its included tube rings, carry handle, and 300mm Vixen-style dovetail plate.

With the 2-inch eyepiece holder, the retractable dew shield gives 603mm retracted and 754mm stretched. The CNC-machined tube has a smooth coating with bright green decorative rings and knobs.

Visual Use: A High-Contrast 107mm APO for Planets and More

The 107PHQ is a nice choice for visual observation: it fits 1.25-inch and 2-inch diagonals and various eyepieces and reaches focus. It can even be used to observe planets with a super-high magnification eyepiece.

With a 2-inch diagonal you get wide views of open clusters and nebulae; at higher power, Jupiter's cloud bands, Saturn's rings and lunar craters.