Askar FMA180 Pro 40mm f/4.5 Sextuplet Apo Lens / Guidescope / Astrograph # FMA180-Pro (New product launch)

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New & improved V2 Askar FMA180 Pro Astrograph.

This new V2 FMA180 Pro has similar sextuplet air-spaced APO optics, with two pieces of ED glass, as the original model but features a new finder base, 360° rotator and internal focuser.

So, like its predecessor, this new FMA180 Pro is optimised for astrophotography but has integrated functions and a design that makes it more convenient for visual astronomy.

With the multifunctional base (has a finder-shoe and Vixen-type saddle) attached, the FMA180 can be easily mounted onto other telescopes for use as a finderscope or guide-scope.

Supplied with an M48 adapter at the rear.

Back-focus distance is the usual 55mm.

Quick Overview

• ASKAR FMA180 40mm aperture apochromatic telescope/camera lens
• Uses three-element objective lens with two ED elements for superb color correction and image quality
• Also includes built-in three-element focal reducer, thus resulting in a final focal length of 180mm at f/4.5 for wide-field astronomical imaging
• Includes Vixen-style telescope dovetail rail and Vixen-style finder/accessory dovetail base

Product Details

The ASKAR FMA180-Pro is a premium multi-functional optical instrument for serious wide-field astronomical or terrestrial imaging. It is a six-element 40mm f/4.5 fully-multicoated apochromatic guidescope/camera lens with superb image quality.

The heart of the FMA180-Pro is an air-spaced 40mm apochromatic f/5.5 triplet with two ED elements to minimize chromatic aberration. The objective is carefully matched to the included three-element focal reducer (note: this cannot be removed) that transforms the overall focal ratio to f/4.5 and a focal length of 180mm.

The FMA180-Pro is similar to the FMA180 in optical design, although optically superior. This new FMA180-Pro adds a Vixen-style finder base and a 360° rotator, neither of which were present in the original FMA180. What's more, the focuser is designed as internal focusing which promotes its stability and ensures its performance in use as a high-quality, compact astrograph.

On the flip side, however, the FMA180-Pro can only operate at f/4.5 (unlike the FMA180 which could operate at f/5.5 without the reducer). The FMA180-Pro is also not as versatile as the original FMA180 in terms of varying its tube length, is significantly heavier, and also does not include a 1.25" eyepiece holder so its use as a visual astronomy finder or telescope is limited, although still possible if you add suitable

For the price, this fast apochromatic lens offers excellent value and can approach the performance of telescopes that cost three or four times as much. This is especially true when matched with astronomy cameras with smaller 1" and 4/3" sensors. Cameras with larger APS-C and full-frame sensors may reveal slight aberrations at the edge of the field, especially when using the focal reducer.

The FMA180-Pro optical tube assembly terminates in an M48x0.75 male thread for mating with a camera (not included). The back focus is a standard 55mm. You will need additional spacers and/or M48 T rings (not included) to couple your specific camera to the FMA180-Pro.

The optical tube includes a short stalk and a 150mm long Vixen-style telescope mounting rail so that you can mount it directly on compatible mounts or atop another scope. These can be completely removed from the scope when it’s used with a DSLR for handheld shooting or when the camera itself is mounted to a tripod.

The overall tube length is 167.5mm. The FMA180 weighs 800g (1.76 lbs).

OTA Specifications:

• Aperture: 40mm
• Focal Length: 180mm
• Focus Ratio: f/4.5
• Objective Type:Triplet Dual ED Air-spaced APO (Objective lens)Sextuplet Refractor for full-frame astrophotography (with built-in reducer)
• Weight: 800g
• Back-end Thread: M48x0.75 male1.25" Adapter (visual observation mode
• Back focus: 55mm from the base of the rear M48 male thread
• Image circle size: 44mm
• Accessories: FMA180-Pro BodyVixen-style dovetail railVixen-style finder mounting baseManual

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