Astronomy Specialist

ASKAR FMA135 F/4.5 TRIPLET APO LENS

$333.00 USD
SKU: AS-135

Askar

Apochromatic triplet

30 mm

f/4.5

135 mm

0.24 kg


 

The Askar FMA135 F/4.5  is an extremely compact and lightweight triplet apochromatic refractor with one ED (extra-low dispersion) lens. The FMA135, when combined with the built-in three element flattener, is a very capable super wide-field astrograph with minimal chromatic aberration and distortion across an APS-C frame. As well as its superb imaging capability, it can be configured as a visual telescope, finder or guide scope.

 

 

Features

  • Can be used as either a visual telescope or a highly corrected 135mm f/4.5 astrograph.
  • Compact and exceptionally light, at 113mm long and 240 grams.
  • Includes all adapters necessary for use as a photographic, visual, finderscope and guidescope. 
  • 1.25" (M28.5 x 0.6) female thread at the front of the telescope for mounting standard 1.25" filters.
  • Comes with mounting ring with finderscope dovetail base.
  • Extremely portable and versatile construction, ideal for grab and go astrophotography with a star tracker.
  • Highly precise helical focuser.

 

 

 


  

 

Optical design

Air-spaced apochromatic sextuplet with one ED element

Objective diameter

30 mm

Focal length

135 mm

Focal ratio

f/4.5

Mount attachment

Vixen-style finder base

Focuser

Helical focuser

Camera connection

M42 x 0.75, 1.25" adapter 

Backfocus

55 mm

Weight

240 g (without lens covers)

Length

113 mm

SKU

AS-135

 


 

  • FMA135 telescope
  • 1.25" visual extension
  • Tube ring with finder base and adjustment screws
  • Manual

 

 

 

 

 

Single 3 minute shot, Askar FMA135, Sony A7R4.

Customer Reviews

Based on 1 review
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S
S.
Great lens!

I love using this for wide field imaging, its colour accuracy as well as sharpness is fantastic.
Attached is img taken with ASI533MC & Optolong L Pro Filter, from my bortle 8 backyard.

ASKAR FMA135 F/4.5 TRIPLET APO LENS.

ASKAR FMA135 F/4.5 TRIPLET APO LENS

$333.00 USD

Optical design

Apochromatic triplet

Image circle

Focal ratio

f/4.5

Aperture

30 mm

Focal length

135 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

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

0.24 kg

Length

Width

Height

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