Astronomy Specialist

SHARPSTAR 76EDPH APO TRIPLET

$1,599.00

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The Sharpstar 76EDPH APO is a fast apochromatic triplet with a focal ratio of f/5.5 and a focal length of 418mm. The objective lens includes one FPL53 Ohara element with extra low dispersion priorities for a superb chromatic correction.

This telescope is light and compact and it works at its best when combined with its 0.82x field flattener and reducer (not included), resulting in the focal length of 342mm and the focal ratio f/4.5. This corrector is specifically designed for this instrument and it delivers an exceptionally large corrected image circle of 44mm where the full frame fits completely. The large rack and pinion 2.5" focuser can be rotated 360° and it has a reduction gear of 1:10 for precise focusing.

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

Every SharpStar telescope is inspected on the optical bench by Testar and guaranteed against defects. To ensure optimal performance, the collimation of every telescope is tested using a GMK collimator. This instrument incorporates 4 LED lights that are oriented towards the objective lens and a symmetrical reflection of these lights is a synonymous of a good collimation. Here is a sample of the certificate attached to every tested Sharpstar.

GMK collimator on SharpStar 76 EDPH

GMK collimator on SharpStar 76 EDPH

 

This telescope works at its best with its own focal reducer and corrector delivering a fully corrected field of view for the full frame sensors. The CCD inspector results shows that across the entire full frame this telescope produces a "curvature" of only 18.6%. That means at the corner of a full frame sensor, stars are only 18.6% larger than in the center. For more information about CCD Inspector, please read this article in the Testar blog.

CCD Inspector results with SharpStar 76 EDPH combined with its field flattener and reducer. 

 

Vignetting SharpStar 76 EDPH

The field is truly fully illuminated for the entire full frame format. The maximum vignetting is less than 3% at the corner of the sensor.

 

Optical design

Apochromatic triplet

Objective diameter

76 mm

Focal length

418 mm

Focal ratio

f/5.5

Resolving power

1.58 arc second

Stellar limiting magnitude

11.4

Max. magnification

152 x

Light gathering power

118 times the human eye

Mount attachment

Vixen bar (150 mm long)

Focuser

Rack & pinion dual speed (10:1) 2.5" diameter

Camera connection

TBA

Backfocus

TBA

Tube weight

2.9 kg (including tube rings and dovetail bar)

Tube length

333 mm

Tube diameter

90 mm

Dew shield diameter

100 mm

SKU

SS-76EDPH

 

  • SharpStar 76EDPH f/5.5
  • 90mm tube ring
  • 150mm Vixen style dovetail bar
  • Handle on the rings
  • Adapter to 2" and 1.25"

 

 

 

Omega Centauri - Sharpstar 76 EDPH @ f/4.5 with field flattener and reducer - Anthony Bailey

 

 
Orion Nebula- Sharpstar 76 EDPH @ f/4.5 with field flattener and reducer - Anthony Bailey

 
Eta Carinae - Sharpstar 76 EDPH @ f/4.5 with field flattener and reducer - Anthony Bailey

 
M8 region - Sharpstar 76 EDPH @ f/4.5 with field flattener and reducer - Anthony Bailey
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