The Askar FMA 135 is an extremely versatile instrument, equivalent to the highly regarded Askar FMA180 model at 135 mm focal length.

The optical system of this refractor is an apochromatic triplet with a single element made of reduced dispersion (ED) glass. Combined with a three-element flattener, it creates a set with high light intensity and a flat field, making it an ideal tool for astrophotography with the use of full-frame cameras or cameras.

This product is equipped with a Vixen foot, thanks to which it can be easily used as a high-class guider, or as a telescope for visual observations with an adapter for 1.25 "glasses.

The most important features of the Askar FMA135 f / 4.5 APO lens

• apochromatic astrophotographic lens that can be used as a guide scope or for direct visual observations
• ED glass lens to reduce chromatic aberrations
• universal fastening with the thread M42x0.75
• built-in adapter for mounting 1.25 "filters in the front part of the lens

Technical parameters

• optical design: apochromatic fixed focal length lens
• Objective lens system: triplet with air gap
• number of flattener lenses: three
• times / scale of the flattener: 1: 1
• number of ED glass lenses: one
• type of coating: full multilayer coating (FMC)
• Front lens diameter (aperture): 30 mm
• focal length without reducer: 135 mm
• focal length with reducer: 135 mm
• light shone without reducer: f / 4.5
• light shone with reducer: f / 4.5
• additional filter mounting: yes, 1.25 "filter mounted in the front part
• focusing: manual
• back focus: 55 mm
• mount for optical tube: Vixen
• camera / camcorder mount: M42x0.75 thread
• eyepiece adapter: 1.25 "
• length (with flattener): 113 mm
• diameter: 40 mm
• weight: 240 g

Elements of the set

• Askar FMA135 f / 4.5 APO lens
• 1.25 "eyepiece adapter
• fixing screws (5 pieces)
• fastening ring
• documentation

Warranty

24 months