TEC APO 140 f/7 Fluorite Apochromat

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TEC APO 140 f/7 Fluorite Apochromat

# 1351005

€ 10,680.00 Price excl. German VAT tax (19%): € 8,974.79

  • Apochromatic Triplet Objective
  • Clear aperture 5.5" (140 mm), focal length 980 mm
  • Excellent color correction thanks to glass combined with Fluorite as a middle element
  • The color correction is optimized for visual use with focus shift less than 0.02% from 436nm to 1000nm.
  • Durable oil spaced lens - Why an oil-spaced triplet-lens?
  • 3.5" Feather Touch Focuser of Starlight Instruments
Important note: This product is not in stock and has a longer delivery time. Therefore it cannot be sold online. If you are interested, please send us a formal inquiry incl. contact data by email.

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 TEC APO 140 FL Fluorite Apochromat


TEC APO 140 - the most popular size of all TEC telescopes TEC (Telescope Engineering Company)  is now available as fluorite apochromat.

It is for everyone’s needs. The scope is light weight, portable, and can be used for visual or CCD imaging. With the suitable field flatteners and reducers a world of possibilities is open to you. Due to its optical design, even solar observation is possible, whether with H-alpha filters or whitish light using a Herschel Prism.

  • The objective is housed in an aluminum cell, providing for excellent thermoregulation properties while remaining lightweight and strong.
  • The optical assembly sits in a lightweight aluminum tube that utilizes anti-reflective coating and sharp-edged baffles throughout the interior and forget about collimation – after the scope leaves TEC, no adjustment is required.
  • Each APO140FL F/7 comes equipped with a Starlight Instruments FTF#3545 Feather Touch Focuser that was designed in collaboration with TEC. This is Starlight Instruments’ largest rotating focuser with coarse and fine focusing 9:1 Planetary Reduction Assembly.
  • The 2” locking metal collet is insensitive to temperature fluctuations and holds loads with high precision and concentricity.
  • Able to accommodate a wide variety of eyepieces and mounts.

The previously already extraordinarily good device is now even better and convinces with an extraordinary color fidelity, which is in no way inferior to its larger siblings the 160 and 180 FL. Anyone who has ever been able to look through a genuine fluorite apochromatic will always remember the "crystal-clear", white image. Not to be neglected is the transmission, whereby fluorite is clearly superior to ED glass. While glass and ED glass (fluoride) still produce minimal stray light, no stray light can be detected with a fluorite element. The most impressive way to demonstrate this is with a green laser. The energy-rich green beam is clearly visible as a beam when it passes through all glass substrates - not only when it passes through the fluorite, as the laser beam remains invisible.

The advantages of Fluriote to ED glass: less absorption and more transmission

APO 160 FL Apochromat vs. APO 140 ED

The TEC APO 140 FL has number of features that in a given combination are rarely found in one scope:

  • Precision apochromatic objective with modern coating that makes lenses almost invisible
  • Oil-spaced and fully sealed lens triplet, for fastest thermal adaptation and minimum of haze and reflections
  • Retractable baffle
  • Light tube assembly
  • FeatherTouch 360° rotatable focuser with coarse and fine focusing
  • Collet type eyepice holder
  • Line of accessories, including: Dovetail plate (same width and fit as Losmandy plates), Finder bracket with new principle of finder adjustment, Choice of two kind of cases.
Korrigiert von 436- bis 1000 Nanometer. Optimiert für die e-Linie bei 546 nm
  • APO140 is an Aplanatic oil-spaced Triplet refractor, PV 1/20
  • The color correction is optimized for visual use with focus shift less than 0.02% from 436nm to 1000nm.
TEC 140 APO FL geschwärzter Innentubus
TEC 140 APO with oil-spaced and fully sealed lens triplet!
TEC 140 APO ED Rohrschellen
CNC machined, black anodized aluminum, compact and lightweight design with stainless steel latches
TEC 140 APO ED Feather Touch Fokussierer
The Feather Touch 3545 was a collaborative design effort between Telescope Engineering and Starlight Instruments for TEC's line of fine
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Additional Information

Manufacturer TEC
SKU (#) 1351005
EAN Code 4047825018953
Optical Design Apochromatic Refractor
Aperture (mm) 140 mm (5.5")
Focal Length 980 mm
Focal Ratio f/7
Backfocus 6.7" (170mm)
Tube diameter (max) 5.9" / 150 mm
Image Scale 3,5 arc min / mm
Optical length (mm) 34" / 864 mm (shortest)
Optical Tube Weight 19lb / 8.6 kg (add 2 lbs with tube rings)
Included Items
Focuser Starlight Instruments 3,5" Feather Touch

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Alan Jadanić 37/02/2021 07/02/202106:58
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Solar imaging with the TEC 140 f/4 Fluorite Apochromat
On 2 June 2021, our customer Alan Jadanić sent us these amazing solar images taken with the TEC APO 140 f/7 Fluorite Apochromat. He used our kam unser D-ERF Energy rejection filter 75mm, a Solar Spectrum H-alpha Filter and the Research Grade TZ-3 Telecentric System (3x focal length). Thank you!

We would like to empahasise the multifunctional usability of the TEC APO 140 FL for DeepSky, visual observations and H-alpha. This optic can really be used day and night and is therefore a real all-rounder.

"Dear Mr. Baader,

I have spent a few days with the TEC 140FL and a Solar Spectrum RG38 0,5Å filter and I must say that it is a very good filter both for visual observations and photography. The telescope for itself is an exceptional piece of astronomical equipment and with an excellent sharpness. With an ASTF 140 solar filter for white light, you can see the sunspots perfectly and even solar granulation is clearly visible. The FeatherTouch 3545 focuser is probably the best focuser you can find on the market and it comes as a standard with TEC 140FL..."

Find out more in our Blog: "Solar imaging with the TEC 140 f/4 Fluorite Apochromat":
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