SHARPSTAR 94EDPH APO TRIPLET F/5.5
The Sharpstar 94EDPH APO is a fast apochromatic triplet with a focal ratio of f/5.5 and a focal length of 517mm. The objective lens includes two Extra Low Dispersion glass elements for 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 414mm and the focal ratio f/4.4. 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 3" focuser can be rotated 360° and it has a reduction gear of 1:10 for precise focusing. The telescope has a long backfocus to allow the use of flattener/reducers and any kind of accessory. To reach the focus without the flattener/reducer, it is recommended to use a 50mm tube extension. The focuser is compatible with the ZWO EAF electronic focuser bracket.
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.
To ensure optimal performance, we test every single telescope on an optical bench, using an artificial star in autocollimation. This test can easily reveal the presence of optical defects such as spherical aberration, astigmatism, zonal errors, coma or optical elements out of collimation. The light from the artificial star travels from the eyepiece holder through the lenses and it gets reflected by a high quality Zerodur flat mirror with a correction peak-to-valley of λ/20. Then, the light travels back through the lenses, gets divided by a beam splitter, then is magnified by a high quality Barlow and finally analysed with an eyepiece and a camera. This is a test in double pass and any optical aberration gets magnified twice and therefore optical errors can be easily detected.
| Optical design |
Apochromatic triplet air spaced |
|
Objective diameter |
94 mm |
|
Focal length |
517 mm |
|
Focal ratio |
f/5.5 |
|
Resolving power |
1.28 arc second |
|
Stellar limiting magnitude |
11.62 |
|
Mount attachment |
Vixen bar (150 mm long) |
|
Focuser |
Rack & pinion dual speed (10:1) 3" diameter |
|
Camera connection |
M74 x 1, 2", 1.25", M48 x 0.75 (with flattener) |
|
Backfocus |
55 mm from flattener (sold separately) |
|
Tube weight |
3.3 kg (including tube rings and dovetail bar) |
|
Tube length |
468 mm |
|
Tube diameter |
118 mm |
|
Dew shield diameter |
122.18 mm |
|
SKU |
SS-94EDPH |
- SharpStar 94EDPH f/5.5
- Tube rings
- 150mm Vixen style dovetail bar
- Carrying handle
- Adapter to 2" and 1.25"
M31 - Sharpstar 94EDPH Apo Triplet Refractor with f/4.4 Reducer. Finally we got some clear sky. (Melbourne) The Sharpstar 94EDPH performed well with the focal reducer and flattener. At last I have some nice round stars right to the edge of the frame with my attached ZWO ASI183MC pro, very happy with the first go. even under bad seeing, 8 bortie and moon at 82% Illuminated . I have attached the first pic of the Cats Paw Nebula 184 frames at 60 sec(well it may not be the best picture for some but its magic to me) The focuser was real smooth and very sturdy I hope to get the ZWO auto focuser added some time in the future. (the only thing I would like to see is a flattener with out the reducer so you could get that extra bit of focal length) apart from that Love it
