Aero ED SWA 2'' eyepieces

Aero ED SWA 2" eyepieces

  (1 Review)
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About this product

Model:  sw_aero_eyepiece-1
Part Number:  20179

The 2” Aero SWA eyepieces feature modern ED glass in a 6-element, four group design for well-corrected wide-field views virtually free of distortion and false colour.

  • Impressive 68 degree fields of view.
  • Multi-coating on all air-to-glass surfaces for increased light transmission and image contrast.
  • Edge-blackened lens edges.
  • All three are parfocal.
  • eyepiece barrels are threaded to accept standard 2” filters.
  • Twist-up rubber eyecups and generous eye relief for spectacle wearers.
  • Finished in hard black-anodised aluminium with knurled rubber grips. 

>Available in focal lengths of 30mm, 35mm & 40mm, with eye relief of 16.7mm, 17.5mm & 20mm respectively. 

Customer reviews

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40mm Aero
Saturday, 28 May 2011  | 

The rule of thumb goes that you shouldn't use eyepieces that exceed a 7mm exit pupil, especially in telescopes with central obstructions. But rules are there to be broken, and being a young, rebellious chap (with quite large pupils), I decided to try out the 40mm in my f/5 and f/4.5 reflectors, giving 8-9mm exit pupils. I did not notice any central darkening and in fact got very pleasant views. I have to say it is one of the sharpest widefield 2" eyepieces I have tried, and performs very well even at these focal ratios.

Eye relief is pretty generous, but not too long as to cause kidney beaning - it is very comfortable to view through. Build quality is not up to the high-end standard, but is perfectly adequate. I very much appreciate the tapering barrel as it provides security without the likelihood of getting caught on compression rings. It is also small and light for a 2" eyepiece.

One curiosity I noted about the 40mm is the inability to fully accept 2" filters. They screw in about half a turn before jamming.

In summary, a fantastic sharp eyepiece with a very reasonable price tag.


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