SVBONY SV152 20mm 70° Illuminated Crosshair Eyepiece (1.25″)

Product Overview

The SVBONY SV152 is a 1.25″, 20 mm eyepiece with a 70° apparent field and an illuminated single crosshair reticle. A clip-on LED illuminator lights the crosshair red, with adjustable brightness, so you can centre a star precisely without losing night vision. The optical design is 5 elements in 4 groups, fully multi-coated, with 16 mm eye relief and a 25 mm field stop. It runs on two 1.5 V button cells and weighs 221 g.

Who It's For

This is a good match if you need a reticle eyepiece for centring stars during mount alignment, manual guiding, aligning a finder or guide scope with your main telescope, or checking that a target sits dead-centre before handing over to a camera.

Key Features & Design

• Illuminated single crosshair: red LED with adjustable brightness to suit faint or bright stars.
• 20 mm, 70° field: a wide view that makes it easy to find a star before centring it.
• 16 mm eye relief: comfortable viewing with a rubber eyecup.
• Fully multi-coated, blackened lens edges: good light transmission on faint stars and reduced internal reflections.
• Two-step anodised aluminium body: matte finish that resists glare.

Optical Design

The SV152 uses a 5-element, 4-group design with full multi-coating and blackened edges. The 25 mm field stop with a 20 mm focal length gives a true field that is generous for a reticle eyepiece, and the crosshair sits at the focal plane so it stays sharp as you focus on the star. The bottom of the barrel carries a standard M28.5 x 0.6 filter thread.

Recommended Uses

• Mount alignment by centring alignment stars precisely.
• Manual guiding with a guide scope or off-axis setup.
• Finder and guide-scope alignment with the main telescope.

Compatibility and Accessory Notes

• Barrel: 1.25″, fits any 1.25″ focuser or diagonal.
• Filter thread: M28.5 x 0.6 standard 1.25″ filters.
• Power: two 1.5 V button cells, included.

What's in the Box

• 1 x 1.25″ SWA 70° 20 mm eyepiece
• 1 x LED illuminator
• 2 x rubber eyepiece caps
• 2 x 1.5 V button cells
• 1 x lens cloth

Good to Know Before You Order

• Batteries: two 1.5 V button cells are included; spares are a standard size.
• Single crosshair: the reticle is a plain crosshair rather than a double-line or scaled reticle.

Frequently Asked Questions

Is it difficult to set up?

No. Fit the illuminator, insert the eyepiece in the focuser, focus on a star and turn up the LED until the crosshair is just visible.

Can I use it for general observing?

Yes. With the LED off it is a 20 mm, 70° eyepiece, though the crosshair remains in the view.

Is the brightness adjustable?

Yes. The LED brightness is adjustable so the crosshair can be set dim for faint stars.

Bottom Line

In short: a 20 mm, 70° 1.25″ eyepiece with an adjustable red-lit crosshair for centring stars, aligning finders and guiding by eye.