Astro-Physics 175mm f/8 StarFire EDF Triplet Apochromatic Refraktor

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Astro-Physics 175mm f/8 StarFire EDF Triplet Apochromatic Refraktor

# 1400175

€ 28,500.00 Price excl. German VAT tax (19%): € 23,949.58
1

LAST PIECE IN STOCK:

  • Apochromatic Triplet Objective
  • Clear aperture 175 mm (6.9"), focal length 1400mm (55.1")
  • Compact, lightweight tube assemblys, fully baffled
  • multi-coating technology will provide optimum light transmission
  • incl. 4" Focusers with greaseless drawtube (Rack and Pinion), f/8.3 CCD Field Flattener and carrying case

At this year's ATT, on 18 May 2019, you can directly purchase the AP 175 EDF in its unopened original box.

Important note: This product is not available online. If you are interested, please ask directly Mr. Johannes Baader on the ATT.

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Description

Details

175mm f/8 StarFire EDF-4 Triplet Apochromatic Refractor

175mm Refraktor
175 mm f/8 StarFire EDF and 1600GTO German Equatorial Mount

After extensive testing on the optical bench using interferometers and autocollimation and nights of visual observing and CCD imaging, Roland sums up his impressions:

"I am happy to say that this scope performs up to my full expectations. The design is topnotch using the best glasses available polished to a high degree of perfection. The lenses will be coated with very low reflection multi-layers - less than 0.2% average reflection per surface. The design is broad spectrum correction, for both visual and CCD imaging. The glass is ultra-clear BK7 crown mated to Ohara FPL53 premium ED glass. The result is magic."

Technical specicifactions at a glance:

  • Clear aperture 175 mm (6.9"), focal length 1400 mm (55.1")
  • CNC machined tube, with multiple baffles reduce stray light to a minimum. Multi-coating technology will provide optimum light transmission greater than 97% (540 nm)
  • Compact, lightweight tube assembly
  • 4" Rack and Pinio focuser with greaseless drawtube and the dual-speed mechanism of FeatherTouch 9:1 Micro, with 4.15" travel. The drawtube millimeter scale provides position repeatability.
  • The rotating focuser collar will enable you to frame your photographs for optimal artistic composition or to keep north up.
  • Fully retractable, felt-lined dewshield uniquely designed to aid in dew prevention
  • f/8.3 CCD Field Flattener is included
    The 175 f/8.3 Prime Focus Field Flattener is made specifically for the 175 f/8 StarFire EDF with its 4" focuser. This f/8.3 CCD Field Flattener provides correction that is essentially diffraction-limited over a 76 mm (3") circle, encompassing 3.0 degrees of sky. Stars will be pinpoint into the extreme corners of the field. Please refer to the original website of Astro-Physics for detailed information, field sizes and spacing requirements diagram. The distance from the field flattener to the focal plane is critical and must be maintained +/- 2.5 mm. If you remove the extension piece, the distance is 114.9 mm (4.5") from rear of housing to the focal plane; plenty of room for rotators, filter wheels, etc.
  • f/6.1 CCD Telecompressor Corrector must be purchased separately. This optimized design uses 3 elements of high-index glass to widen and flatten the field while increasing the photographic speed of the 175 StarFire EDF triplet refractor from f/8 to f6.1 (focal lenth 1064mm). This results in a field of view of 2.8 degree at an image circle of 53mm. The distance of the back of the housing to the image plane must be within 1 mm of ideal (80.8 mm +/- 1 mm).

The 1600GTO German Equatorial Mount is recommended fot the 175mm f/8 StarFire EDF-4 Triplet Apochromatic Refractor.

Also included:

  • Tube Assembly with 4" Focuser, Dew Shield and Dustcover
  • Dedicated CCD Field Flattener - matched to the 175EDF
  • 2.7", 2" and 1.25" Adapters and 4" Focuser Extension
  • Wood case

For further information and useful accessories about the 75mm f/8 StarFire EDF-4 Triplet Apochromatic Refractor please visit the original website of Astro-Physics. If you are interested, please send us an email to kontakt (at) baader-planetarium.com or call us.

Astro images taken with the AP 175mm - f/8.3 Starfire with CCD Field Flattener:

Saturn
Saturn, taken with Sony Nex-7 Digital Camera, imaged by Roland Christen.
M57
Messier 57, taken with QSI683 CCD Camera with 5.4 micron pixels, imaged by Roland Christen
I1276
I1276, imaged by Bernhard Hubl @ ATHOS La Palma, taken with 175mm EDF, f/8.3 CCD Field Flattener
LBN0007
LBN0007, imaged by Bernhard Hubl @ ATHOS La Palma, taken with 175mm EDF, f/8.3 CCD Field Flattener
vdb 123
vdb 123, imaged by Bernhard Hubl @ ATHOS La Palma, taken with 175mm EDF, f/8.3 CCD Field Flattener
M020
M020, imaged by Bernhard Hubl @ ATHOS La Palma, taken with 175mm EDF, f/8.3 CCD Field Flattener
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Specifications

Additional Information

General
Manufacturer Astro Physics
SKU (#) 1400175
Manufacturer SKU (#) 175EDF
EAN Code 4047825028617
Optics
Optical Design Apochromatic Refractor
Clear Aperture 175 mm (6.9")
Focal Ratio f/8
Optical Coatings Multi-layer, broadband, overall transmission greater than 97% in peak visual wavelengths
Magnification (x) 25x to 700x
Tube (Material) Cream white, 8.0" CNC machined aluminum tube, baffled, flat-black interior, push-pull lens cell, engraved retaining ring
Optical length (mm) 51.25" (1302mm) with dewcap fully retracted
Mount
Included Items
Focuser 4.0" I.D. Astro-Physics rack & pinion focuser, 4.15" travel; 2.7", 2" and 1.25" adapters; 4" extension; rotating collar; numerical scale
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