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CFF Telescopes

140mm Refractor - Super Planetary Series


  • 7,59500

This item is out of stock but you can place an order now and we’ll ship when it becomes available.


Description:

Medium size refractor that is targeting visual astronomers, interested in top quality planetary views. Delivers contrasty, sharp images of planets and deep sky objects.  Both longer focal ratio versions are aiming at planetary observers that want to enjoy best correction possible at the eyepiece. CFF is tuning these for planetary-visual correction.

Characteristics:

Clear aperture - 140 mm
Focal length - 1050 mm; Focal ratio - 7.5 - Super Planetary Series
Focal length - 1260 mm; Focal ratio - 9 - Super Planetary Series

Optical Quality:

From CFF Optical Designer, Pal Gyulai:

"All our objectives are guaranteed to have a minimum of .96 Strehl in green light and are optimized for the wavelengths where eye is most sensitive, 555 - 560 nm.

· Manufacturing specifications:

        - Strehl ratio better than 96% at 532 nm.
        - Wave front error p.t.v. is no more than 0.166 of wave-length at 532 nm.
        - Surface finish: IV class according to 11141-84

· Dimensions of scratches and points/inclusions shall not exceed the following values:
   · Scratches with less than 0.02mm width:
        - Number of scratches: less than 0.1 clear aperture
        - Total length of scratches: less than 1 clear aperture.
   · Points with less than 0.3mm diameter:
        - Number of points: less than 0.25 clear aperture
   · Total area of all defects: less than 0.05 clear aperture (mm2)

· Multiple layer coatings on front and back surfaces. Reflectivity = 0.25%/surface.

· Slight color variations in the light reflected from anti-reflection coatings are allowed.

· Bubbles and inclusions in glass material are allowed under 0.5mm diameter. Maximum number of bubbles and inclusions is 2 pieces per lens. Bubbles and inclusions under 0.03mm diameter are disregarded."

Dimensions:

Minimum length - from 780 mm (fully retracted dew shield)*
Maximum length - up to 1340 mm (fully extended dew shield)*
Back-focus - 180 to 220 mm (on request);
Tube diameter - 145 mm;
Dew shield diameter - 164 mm;
Weight - 10 kg, including rings*

Please choose your focal ratio at time of order.  Both f7.5 and f9 models are offered only with 3'' Starlight focuser.

Accessories included in the price: CNC rings, flight case.

Price is inclusive of import costs.

Notes:

* Minimum and Maximum Length values are dependent on focal ratio and back-focus value chosen;
* Weight may vary from version to version, depending on back-focus, focuser type;
* f7.5 and f9 models are offered only with 3'' Starlight focuser;

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