Astronomy Specialist

SHARPSTAR AL-140PH APO TRIPLET F/6.5

$5,799.00 AUD $7,299.00
SKU: SS-AL-140ED

Sharpstar

Apochromatic triplet

140 mm

f/6.5

910 mm

11.7 kg


Flattener


The Sharpstar AL-140PH APO is an apochromatic triplet with a focal ratio of f/6.5 and a focal length of 910mm. The objective lens includes two Extra Low Dispersion glass for a superb chromatic correction.

The large rack and pinion 4" focuser can be rotated 360°and it has a reduction gear of 1:10 for precise focusing. This refractor works at its best when used with the SharpStar 2.5" field flattener for superior performance in astrophotography. The focuser is compatible with the ZWO EAF electronic focuser bracket.

 

All the lenses are fully multi-coated and the tube is internally flocked to reduce reflections and absorb stray light. The tube is made of aluminium, the rack and pinion focusing mechanism of brass and the mechanical components are engineered to provide the best rigidity, performance and durability.


      Chromatic aberration diagram

       

      Optical design

      Apochromatic triplet dual ED air spaced

      Objective diameter

      140 mm

      Focal length

      910 mm

      Focal ratio

      f/6.5

      Resolving power

      0.86 arc second

      Stellar limiting magnitude

      12.7

      Max. magnification

      280 x

      Light gathering power

      400 times the human eye

      Mount attachment

      Losmandy style bar

      Focuser

      Rack & pinion dual speed (10:1) 4" diameter

      Camera connection

      M102 x 1 male / M88 x 1 female / M68 x 1 female

      Backfocus

      88 mm from flattener (sold separately)

      Tube weight

      11.7 kg (including tube rings and dovetail bar)

      Tube length

      876 mm (738 mm with retracted dew shield)

      Tube diameter

      148 mm

      Dew shield diameter

      179 mm

      SKU

      SS-AL-140ED

       

      • SharpStar AL-140ED f/6.67
      • 148mm tube rings
      • Losmandy style dovetail bar
      • Adapter to 2" and 1.25"
      • Foam-lined aluminium case