Ursa Major

Ursa Major FMC Flatfield Eyepiece 3.5mm

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ursamajor_fmc_ff_ep_3.5mm
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Product Overview

Ursa Major FMC Flatfield Eyepiece 3.5mm

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

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