Chris says
"The Ursa Major FMC eyepiece range offer an immersive 60-65 degree field of view, comfortable eye relief for spectacle wearers, and very good edge of field correction for eyepieces in this price range."
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About this product
Model: ursamajor_fmc_ff_ep_5.5mm
Ursa Major FMC Flatfield Eyepiece 5.5mm
An excellent alternative to regular Plossl or Orthoscopic eyepieces.
Ursa Major FMC Flatfield eyepieces have a five to six-element optical design that provides surprisingly high performance, generous eye relief and a wide apparent field of view from 60 to 65 degrees, depending on the focal length.
Their Flatfield design with fully multicoated, edge-blackened optics reduces field curvature and enhances brightness and contrast.
The black-anodised 1.25" nosepiece has a safety taper (for a secure fit in the focuser) and is threaded to accept 1.25" astronomy filters.
Each Ursa Major FMC Flatfield eyepiece is beautifully finished with a tactile grip and a fold-down rubber eye cup for comfortable viewing.
Supplied with a lens cleaning cloth and an eyepiece bag.
Eyepiece Field of View Simulator
Specifications
| Focal Length | Lens Elements/Structure | Apparent Field of View | Eye Relief | Barrel | Coatings | Filter Thread | Field Stop Diameter | Eye Cup |
| 3.5mm | 6/4 | 60° | 15mm | 1.25" | Fully Multi Coated | M28.5X0.6-3.9 | 3.9mm | Fold Down |
| 5.5mm | 6/4 | 60° | 16mm | 1.25" | Fully Multi Coated | M28.5X0.6-3.9 | 6.4mm | Fold Down |
| 7.5mm | 6/4 | 60° | 16mm | 1.25" | Fully Multi Coated | M28.5X0.6-3.9 | 8.6mm | Fold Down |
| 10.5mm | 5/4 | 60° | 16mm | 1.25" | Fully Multi Coated | M28.5X0.6-3.9 | 11.7mm | Fold Down |
| 15.5mm | 5/3 | 65° | 16mm | 1.25" | Fully Multi Coated | M28.5X0.6-3.9 | 17.4mm | Fold Down |
| 19mm | 5/3 | 65° | 20mm | 1.25" | Fully Multi Coated | M28.5X0.6-3.9 | 20.3mm | Fold Down |
| 25mm | 5/3 | 65° | 23mm | 1.25" | Fully Multi Coated | M28.5X0.6-3.9 | 25.9mm | Fold Down |
Customer reviews
| Average Rating (2 Reviews): | |
15 September 2024 | Alan
I needed reasonably high power eyepiece which I could keep with a solar telescope for convenience; the Ursa Major 5.5mm was just about right and didn't cost too much, so I got one. The performance is very good at this price. It's sharp across almost all of the field, with only a little softening at the extreme edges, and there is no noticeable chromatic aberration. A bit of barrel distortion is present, but it's no worse than most other eyepieces I've used, and isn't a serious fault. Another merit is the absence of the annoying kidney bean effect at small exit pupils. I've also bought the 3.5mm, 19mm and 25mm versions, and these are very similar.
17 May 2024 | Louise
I bought the Skywatcher Star Discovery P150i and various accessories, including this eyepiece. The service from FLO was excellent. I had great advice and useful suggestions, and everything arrived quickly and all on the same day. I would definitely recommend FLO and will be using for future purchases.
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