Sharpstar Z4 Sextuplet APO Astrograph
 Sharpstar Z4 Sextuplet APO AstrographSharpstar Z4 Sextuplet APO Astrograph 

Sharpstar Z4 Sextuplet APO Astrograph

Now: £2,078.28 (Save:  £180.72) Was:  £2,259.00✓ 2 year warranty


2x in stock shipped 1-2 working days

Black Friday / Holiday Sale 2022 - Save 8-10% on many SharpStar and Askar products.

Sale Ends Midnight, 2nd January 2023 subject to availability.

About this product

Model:  askar_z4
Part Number:  Z4

The new Sharpstar Z4 100mm Astrograph features a Sextuplet design with a 3 element front lens and a 3 element rear integrated corrector.

In response to user demand Sharpstar have introduced this exciting new Astrograph. With an aperture of 100mm and focal ratio of F5.5, the 6 element design provides a wide and flat field of view with no need to use bolt on reducers or flatteners. The Z4 is an ideal portable flat field astrograph perfectly suited to todays crop of dedicated CMOS Imaging Cameras as well as modern DSLR and Mirrorless cameras.

The appearance of the Z4 is a departure from the previous style of Sharpstar telescopes with its matte grey coating, Light grey lens tube plus dark grey focuser and tube ring, make this astrograph look calm but vibrant.

The tube ring has a handle on the top which is easy to carry and assemble. The handle is designed as a slot upon which you can mount a finder base, etc. 

The Z4 uses a large 3.4” focuser with a 1:10 fine adjustment knob and 360° rotation for easy focusing and angle adjustment. It has M82, M68, M54, M48 adapters, and the M48 one has an internal thread for installation of 2” filters. The included 300mm Vixen-style dovetail plate, makes it easier to balance on the equatorial mount.


Focal ratio:  F/5.5

Objective lens:  sextuplet fully air-spaced  APO (including two ED glasses)

Image circle:  36mm

Back focus:  55mm(from the M48 thread)

Total length:  482mm

Net weight:  4.3kg

Gross weight:  5.6kg(without the aluminum box)

Rear-end thread:  M48×0.75 male thread

Tapered adapter:




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







What's in the box

  • 100mm tube rings
  • 300mm Vixen dovetail plate
  • Carry handle
  • 4-piece photographical adapter
  • Instruction manual

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