CFF Telescopes 140mm f/7.5 Oil-Spaced Triplet Apochromat

Starting Price: $0.00
Price as Configured: $0.00
Brand: CFF Telescopes / SKU: CFF-140F7.5
CFF telescopes are custom manufactured on request. Please inquire about delivery times.
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About This Product
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Not available until 2022
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CFF General Optical Specifications

All CFF objectives are guaranteed to have a minimum of .96 Strehl in green light and are optimized for the wavelengths where the 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 0.02 mm width:
    • Number of scratches: less than 0.1 clear aperture
    • Total length of scratches: less than 1 clear aperture.
  • Points with less than 0.3 mm diameter:
    • Number of points: less than 0.25 clear aperture
  • Total area of all defects: less than 0.05 clear aperture (mm2)

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

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

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