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APM Doublet SD APO 140-980 f/7 FPL53 Optical Tube with 2.5" Dual Speed Focuser

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Model
APM140-7-2.5ZTA
Weight
8.80 kg
RRP:
£2799.00
Our price:
£2549.00
9%

including VAT 20.00 % ( £424.83 )
Qty

This product listing is the APM 140mm f/980mm Doublet SD APO f/7 with FPL53 lens element and with 2.5" Rack and Pinion Dual Speed focuser, hower in the product description further down you will find information about other versions and optional accessories as well...

The new APM 140-980 Super ED Doublet will introduce a whole new group or astronomers to APM quality. Featuring an APM designed 140mm F7 doublet objective using a combination of FPL-53 super low dispersion and Lanthanum glasses. The new 140 offers true Apochromatic performance with outstanding sharpness and contrast.

OVERVIEW

  • Doublet Super ED Apochromatic Refractor
  • Ohara FPL-53 / Lanthanum Element. Multicoated
  • Aluminium Tube
  • APM 2.5 Focuser
  • Retractable Dew-Shield
  • Tube Rings
  • Finder Shoe Bracket
  • 2” and 1 ¼” Eyepiece Adapters
  • StarTest Report

With its low F7 focal ratio the 140 is a very compact scope that weighs under 9kg making it an easily transportable scope that is well matched to smaller mounts.

The 140-980 is also a very capable imaging scope and being F7 also allows it to provide reduced imaging times. When fitted with the optional APM Massimo Riccardi 0.75x reducer, the 140 offers the field of view equivalent to a 735mm scope with a fast F5.25 aperture having a corrected image circle of 40mm. An optional normal field corrector (model TSFlat2.5) is also available for imaging at the native focal length.

As you would expect from an APM scope, attention is also paid to the tube. This is aluminium in construction and contains multiple baffles optimised for focusers up to 3”. As with our 152ED, the tube is fitted with a thread adapter allowing the Starlight Instruments FT-3035 3” focuser to be fitted in place of the standard 2.5” Focuser model. There is also a 3.7” focuser option offering greater load capacity for imaging applications

A further enhancement available as a custom option is to have the specialised Phenolic compound tube offered with our LZOS models. This tube has excellent anti-dewing performance, minimal focus shift and a complex and flocked baffle system to maximise contrast. This tube option is available with APM 3”, Starlight 3” and 3.5” focusers only.

The 140/980 is supplied with a star test to ensure optical consistency and the performance expected from APM.

Even though the new 140 offers incredible value no corners are cut.

Each lens cell must meet strict quality control. Before delivery to customers, each lens cell is carefully collimated and star tested to ensure that customers experience each scope at its best.

FOCUSER

The new 2.5" focuser is a Rack and Pinion type, with 1:10 focusing. It remains rigid under high loads making it suitable for imaging. The attention to detail extends to areas like the 2" and 1.25" eyepiece adapters. These use a new design of collar clamp, far superior to the common brass compression rings found on lesser designs. Of course, if you would like to use a Starlight Instruments Feather Touch (model FTF3035B-A) then this can be supplied as an option, for that reason the tube end has an thread M109 x 1 and M95 x 1 to accept a 3" or 2.5" Starlight focuser.

SPECIFICATIONS

  • Length 1070mm (1210mm Observing)
  • Max Diameter 186mm
  • Tube Weight 19.8Ibs / 9kg
  • Aperture 140mm
  • Focal Length 980mm
  • Focal Ratio f7
  • Resolution 0.76” Arc Seconds
  • Limit Value 12.7 Magnitude
  • Max Mag 280x

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