CFF Telescopes 140mm f/6.5 Oil-Spaced Triplet Apochromat
Starting Price: $9,000.00
Price as Configured: $9,000.00
Price as Configured: $9,000.00
Brand: CFF Telescopes / SKU: CFF-140F6.5
CFF telescopes are custom manufactured on request. Please inquire about delivery times. Please do not order without contacting us first.
NOTE: Packaging and shipping cost will be determined when the order is ready to ship and must be paid for before the equipment will ship. A shipping quote can be obtained on request.
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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 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.
