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CFF Telescopes

105mm Refractor - Super Planetary Series


  • 3,59500

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


Description:

The 105mm Super Planetary Series is similar to the standard 105mm f/6, but with a longer focal length and slower f/ratio.  These scopes are recommended for beginners looking at high quality entry into the hobby, specifically for those interested in planetary viewing and astrophotography.

Characteristics:

Clear aperture - 105 mm
Focal length - 730 mm; Focal ratio - 7*
Focal length - 915 mm; Focal ratio - 8.7 - Super Planetary Series *
Focal length - 1050 mm; Focal ratio - 10 - 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 495 mm (fully retracted dew shield)*
Maximum length - up to 1025 mm (fully extended dew shield)*
Back-focus - 180 to 220 mm (on request);
Tube diameter - 114 mm;
Dew shield diameter - 135 mm;
Weight - from 5.9 kg, including rings *

Please select your focal length and focuser at time of order.  You have a choice of either a 2", 2.5", or 3" Starlight FeatherTouch Focuser (both with 89mm of travel) or a 2.5" Moonlite Focuser with DC Motor and Hand Controller.  Please note that f8.7 and f10 models are offered standard only with 3'' Starlight focuser.

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

Optional Accesories:

  • Field Corrector -> Corrected Field = 52 mm
  • Dovetail, Losmandy Type
  • Handle, paired with Dovetail

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;
* f8.7 and f10 models are offered standard only with 2.5'' Starlight focuser;
* clear aperture for f7, f8.7 and f10 models might be lower (102 mm), depending on raw glass diameter.

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