Astronomy Specialist

OPTIQUES FULLUM FOLDED NEWTONIAN 65" f/3.5

$680,725.00 USD
SKU: OF-65F3.5 FOLDED

Optiques Fullum

Dobsonian

Fullum-folded Newtonian

1651 mm

f/3.5

5778 mm


 

 As these are custom made systems, please contact us to discuss your requirements.

 

Testar Australia is proud to partner with Optiques Fullum to offer the full range of large Fullum-folded Newtonians for the discerning astronomer who demands exceptional quality, ease of use and extreme apertures.

Fullum-folded Newtonian telescope systems are designed, engineered and manufactured in-house by Optiques Fullum and are available with mirrors up to 65" (165 cm) in diameter.

This configuration features a parabolic primary mirror with a very short focal ratio (between f/3.5 and f/4), coupled to a secondary mirror placed much lower than normal, which will redirect the optical axis at a 17.5-degree angle instead of 45 degrees. This results in a more secure focal spot for the observer.

 

 

The folded optical configuration lends itself to comfortable viewing positions even close to zenith. Pictured here is a 36" Fullum-folded Newtonian.

 

For these telescopes, Optiques Fullum fabricates very light custom-designed aluminium and composite structures, with GoTo StellarCat and ArgoNavis tracking systems. 

 

 

Optiques Fullum's unique Techno-Fusion mirror design produces fast cooling mirrors. Never worry about cool-down time and heat plumes again! Another benefit of Techno-Fusion comes from its light-weighting and its unmatched rigidity though a fused structure. You will never find yourself victim of problems found in large solid mirrors such as astigmatism or other self-deflection aberrations.

At the end of the day, your large primary mirror is the hearth of your telescope. At Fullum Optics, they make sure that it’s ready for its mission which is delivering the universe to your eyes without worrying about thermals or flexion.

All mirrors are manufactured according to the highest standards of conical constant accuracy, surface roughness, and critical tolerance specifications.

As these are specialized telescopes which are built to order, every aspect of the system is customized to the exact requirements of the client, be it for visual observation, research or imaging. Price does not include shipping.

 

Optical design Newtonian reflector
Objective diameter 1651 mm
Focal length 5778 mm
Focal ratio f/3.5
Resolving power 0.07 arc second
Stellar limiting magnitude 18.79
Max. magnification 4127 x (theoretical)
Light gathering power 55,629 times the human eye
SKU OF-65F3.5 FOLDED
 

 

Interview with Normand Fullum at the Dorner Telescope Museum.

 

 

Installation of a 50" Fullum-folded Newtonian telescope.

OPTIQUES FULLUM FOLDED NEWTONIAN 65" f/3.5.

OPTIQUES FULLUM FOLDED NEWTONIAN 65" f/3.5

$680,725.00 USD

Optical design

Fullum-folded Newtonian

Image circle

Focal ratio

f/3.5

Aperture

1651 mm

Focal length

5778 mm

Optical thickness

Threads

Cooled

Colour or Mono

Pixel size

Sensor dimensions

Resolution

Sensor diagonal

Quantum efficiency

Read noise

Fullwell capacity

Bit depth

FPS

Camera backfocus

Filter size

Filter size

Bandpass (FWHM)

Bandpass (FWHM)

Glass thickness

Mount type

Dobsonian

Payload capacity

Latitude range

Dovetail saddle

Slew speed

Encoders

Periodic error correction

Counterweight shaft

Azimuth adjustment range

Internal diameter

Illuminated diameter

Compatible telescope external diameter

Weight

Length

Width

Height

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