SVBONY SV112 1.25″ Eyepiece Projection and Prime Focus Kit

Product Overview

The SVBONY SV112 is an all-aluminium 1.25″ camera adapter that works two ways: as a prime-focus adapter that connects a camera straight to the telescope, and as an eyepiece-projection tube that holds an eyepiece between telescope and camera for higher magnification. The camera side is M42×0.75, the 1.25″ barrel carries an M28.5×0.6 filter thread, and the tube accepts eyepieces up to 42 mm in outside diameter with up to 42 mm of variable projection range. It weighs 350 g (12.35 oz).

Who It's For

This is a good match if you want to photograph the Moon and planets at higher image scale through an eyepiece, and also want the option of prime-focus imaging of larger deep-sky targets, with a DSLR on an M42 T-ring or an astronomy camera.

Key Features & Design

• Two imaging modes: prime focus without an eyepiece, or eyepiece projection with one.
• Variable length: sliding the tube changes the projection distance, and with it magnification and framing.
• Laser-engraved scale: for repeatable settings.
• Machined grip ring: secure handling, including in damp conditions.
• Pressure ring: holds the eyepiece barrel without scratching it.
• Filter-threaded 1.25″ barrel: M28.5×0.6 for standard 1.25″ filters.

Optical Design

In eyepiece projection, the eyepiece re-images the telescope's focal plane onto the camera sensor. Moving the camera farther from the eyepiece increases the effective focal length, so the SV112's adjustable tube and engraved scale let you choose the image scale for small targets like Jupiter, Saturn or lunar craters. In prime focus, the camera sits at the telescope's own focal plane for the native field of view, which suits nebulae and galaxies.

Recommended Uses

• Lunar and planetary imaging by eyepiece projection.
• Prime-focus imaging of larger deep-sky objects.

Compatibility and Accessory Notes

• Telescope side: standard 1.25″ eyepiece port.
• Camera side: M42×0.75. SVBONY describes connection to Canon EOS and Rebel DSLRs, which needs the matching T-ring; astronomy cameras connect to the M42 thread.
• Eyepieces: up to 42 mm outside diameter.

Good to Know Before You Order

• T-ring, eyepiece and camera sold separately.
• Focus travel: eyepiece projection moves the focal point outward, so the telescope's focuser needs enough outward travel to reach focus.
• Package contents: SVBONY does not itemise the kit's parts.

Frequently Asked Questions

Is it difficult to set up?

Prime focus is direct: insert the barrel in the focuser and attach the camera. For projection, fit an eyepiece inside, set the length on the scale, and refocus; changing the length changes magnification.

Which eyepieces fit?

1.25″ eyepieces up to 42 mm in outside diameter.

Can I use filters?

Yes. The 1.25″ barrel has an M28.5×0.6 filter thread.

Bottom Line

In short: a 350 g aluminium 1.25″ adapter for prime-focus and variable eyepiece-projection imaging, with an M42 camera thread and room for eyepieces up to 42 mm wide.