SVBONY SV136 2″ 34mm 72° Wide-Field Eyepiece

Product Overview

The SVBONY SV136 34 mm is a 2″ wide-field eyepiece with a 72° apparent field of view and a 40 mm field stop. Its fully multi-coated 5-element, 4-group design gives 24 mm of eye relief, and the barrel carries a standard 2″ (M48 × 0.75) filter thread. At 34 mm it is a low-power, maximum-field eyepiece — the one that frames large nebulae, open clusters and star fields, and the easiest to find targets with.

Who It's For

This is a good match if your telescope has a 2″ focuser or diagonal and you want the widest true field it can deliver — for sweeping the Milky Way, framing the Double Cluster or the Veil, or as a finding eyepiece before switching to higher power. The 24 mm eye relief and folding eyecup work for observers with or without glasses.

Key Features & Design

• 72° apparent field: a wide, immersive view at low power.
• 40 mm field stop: close to the practical maximum for a 2″ barrel, so the true field is about as wide as your telescope allows.
• 24 mm eye relief: with a fixed folding rubber eyecup, usable with or without glasses.
• Fully multi-coated, blackened edges: for contrast and to cut internal reflections.
• Two-step anodized aluminium body: matte finish that resists reflections and glare.
• 2″ filter thread (M48 × 0.75): takes SVBONY 2″ filters.

Optical Design

The SV136 uses five elements in four groups, fully multi-coated, to spread a 72° field across a 40 mm field stop. Because true field is set by the field stop divided by the telescope's focal length, a 40 mm stop gives roughly 2.3° of sky on a 1000 mm telescope at about 29×, and close to 4° on a 600 mm refractor. The exit pupil grows with focal ratio — about 6.8 mm at f/5 — which is worth matching to your telescope and sky conditions.

Recommended Uses

• Large nebulae: the Veil, North America and Orion nebulae, especially with a 2″ nebula filter.
• Open clusters and star fields: the Double Cluster, the Pleiades and Milky Way sweeping.
• Finding and framing: locate targets at low power before moving to a shorter eyepiece.
• Moon and bright planets at low power: whole-disc lunar views.

Compatibility and Accessory Notes

• Barrel: 2″ only — needs a 2″ focuser or diagonal.
• Filters: M48 × 0.75 thread for SVBONY 2″ filters.

Good to Know Before You Order

• 2″ focuser required: it does not fit 1.25″-only focusers.
• Exit pupil: on fast telescopes (f/4–f/5) the exit pupil is large; on Newtonians the secondary shadow can become visible in daylight or bright skies.
• Weight: SVBONY does not publish this eyepiece's weight.

Frequently Asked Questions

Is it difficult to set up?

No. It slides into a 2″ focuser or diagonal and is held by the clamp screw or compression ring like any 2″ eyepiece.

Can I wear glasses with it?

Yes. The 24 mm eye relief and folding eyecup are designed to work with or without glasses.

What is it best for?

Low-power, wide-field observing of large nebulae, open clusters and star fields, and as a finding eyepiece.

Will it work in my 1.25″ focuser?

No; it has a 2″ barrel only.

Bottom Line

In short: a 2″, 34 mm eyepiece with a 72° field, a 40 mm field stop and 24 mm eye relief — a low-power, wide-field eyepiece for telescopes with a 2″ focuser.