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. Vela supernova remnant by Manuel Peitsch taken with the Sharpstar AL-140PH. 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 Specifications 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 Included Items SharpStar AL-140ED f/6.67 148mm tube rings Losmandy style dovetail bar Adapter to 2" and 1.25" Foam-lined aluminium case Gallery Trifid and Lagoon nebulae by Manuel Peitsch | Sharpstar AL-140PH, Antlia LRGB & 3nm Pro SHO filters. Pencil nebula by Manuel Peitsch | Sharpstar AL-140PH, Antlia 3nm Pro Ha & OIII filters. Omega & Eagle nebulae by Manuel Peitsch | Sharpstar AL-140PH, Antlia LRGB & 3nm Pro SHO filters.
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