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180mm F7 Oil Spaced Triplet Refractor CFF

180mm F7 Oil Spaced Triplet Refractor CFF
CFF 180 refractor CFF 180 APO refractor CFF 180 Flattener performance graph
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A 180mm oil spaced triplet refractor for the connoisseur, hand made by Gyulai Pal in Hungary, with mechanics by Catalin Fus of CFF Telescopes, Romania.

This is the largest APO refractor we at Altair Astro can reliably source, offering breathtaking wide and high power views of the heavens with perfect colour correction and incredibly high contrast.

For imaging with the dedicated field flattener (available separately) it is possible to achieve a 55mm image circle with better than diffraction limited performance across this vast field, making this telescope future-proof, even as larger CCD sensors become available. (See the attached flattener wavefront performance diagram).

This telescope is destined to become a classic and is recommended for customers who will not settle for anything less than the best refractor available, which can still be mounted at a reasonable cost.

The lens system is a 3-element oil spaced triplet with FPL-53 element, having an equivalent Abbe number to Flourite, and, despite the massive aperture, the colour correction is still perfect in or out of focus and it meets our "Super APO" criteria.

Each of these telescopes is aspherised by hand for perfect colour correction. They are guaranteed to meet a minimum of 0.96 Strehl at a wavelength of 532nm. This is an iterative process and each lens can take weeks if not months of polishing and testing to perfect.

A dedicated large format field flattener is available, please enquire for specifications.

An extremely tough transport case is supplied.

We sell this OTA with the 3.5" Starlight Feathtouch focuser as standard however other options are available.

Clear aperture - 180 mm
Focal length - 1260 mm
Strehl of tested lenses - minimum .96 @532nm , typical .98
Back focus - 220mm
Minimum Length - 1095 mm
Maximum Length - 1375 mm
Tube diameter - 185 mm
Dewshield diameter - 238 mm
Weight - 16 kgs , including rings (*3.5'' FTF version)

Availability: To be ordered in advance, please contact us for availability.

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