SVBONY SV190 10mm 1.25″ Ultra Flat Field Eyepiece

Product Overview

The SVBONY SV190 10 mm is a 1.25″ ultra flat field eyepiece with a 60° apparent field of view. Its 5-element, 4-group fully multi-coated design flattens field curvature toward the edge, so stars stay sharp across more of the view than in a simple Plössl. Eye relief is 16 mm, the field stop is 14.7 mm, and the barrel carries a standard M28.5×0.6 filter thread. It weighs 84 g.

Who It's For

This is a good match if you want a medium-high power eyepiece for the Moon, planets, double stars and smaller deep-sky objects, with a flatter field and more eye relief than a 10 mm Plössl, including if you observe with glasses.

Key Features & Design

• Ultra flat field: designed to reduce edge curvature and distortion.
• 60° apparent field at 10 mm focal length.
• 16 mm eye relief with a rubber eyecup.
• 5 elements in 4 groups, fully multi-coated, with oversized lenses and blackened lens edges.
• Aluminium body with a filter-threaded 1.25″ barrel.

Optical Design

The five-element layout uses oversized lenses and a field-flattening group so that the image stays in focus closer to the field stop. With a 14.7 mm field stop and 60° apparent field, the true field in your telescope is the 60° divided by the magnification (telescope focal length ÷ 10 mm). Broadband multi-coatings on all air-glass surfaces keep transmission and contrast up on bright targets.

Recommended Uses

• Lunar and planetary observing at medium-high magnification.
• Double stars and globular clusters.
• Small deep-sky objects such as planetary nebulae.

Compatibility and Accessory Notes

• Barrel: 1.25″, fits 1.25″ focusers, diagonals and 2″-to-1.25″ adapters.
• Filter thread: M28.5×0.6 for standard 1.25″ filters.
• Thread under the eyecup: M34×0.75.
• Companion focal length: SVBONY makes the SV190 in 18 mm as well (65°, 20 mm eye relief).

Good to Know Before You Order

• Eye relief figure: SVBONY's specification table lists 16 mm; its description text mentions 10 mm. We list the table figure.
• 1.25″ only: no 2″ skirt.
• Net weight 84 g; package size 110 × 76 × 70 mm.

Frequently Asked Questions

Is it difficult to set up?

No. It drops into any 1.25″ focuser or diagonal and is held by the thumbscrew.

What is the apparent field?

60°.

Can I use filters with it?

Yes. The barrel takes standard M28.5×0.6 1.25″ filters.

Can I use it with glasses?

SVBONY describes the eye relief as suitable for eyeglass wearers; the published figure is 16 mm.

Bottom Line

In short: a 10 mm, 60° flat field 1.25″ eyepiece with 5-element FMC optics and 16 mm eye relief, for sharp medium-high power views of the Moon, planets and compact deep-sky objects.