SVBONY 1.25″ Linear Polarizer Filter

Product Overview

The SVBONY F9165A is a 1.25″ linear polarizer filter in an aluminium M28.5 x 0.6 cell, 2.4 mm thick. It dims the view of bright objects to increase contrast at the eyepiece, and SVBONY uses neutral-coloured optical glass so the Moon keeps its natural colour. Each filter is individually precision ground and polished.

Who It's For

This is a good match if you observe or photograph the Moon and bright planets through a 1.25″ eyepiece or imaging train and want lower glare without the colour tint of a blue moon filter.

Key Features & Design

• Glare reduction: dims the Moon for more comfortable, longer observing sessions.
• Neutral colour: neutral-coloured optical glass keeps the Moon's natural colour.
• Precision optics: individually ground and highly polished optical glass.
• Aluminium cell: standard M28.5 x 0.6 thread, 2.4 mm thick.

Recommended Uses

• Lunar observing: more contrast on craters and terminator detail.
• Bright planets: lower glare on Venus and Jupiter.
• Lunar and planetary photography: SVBONY notes it enhances lunar and planetary contrast in photographic images.

Compatibility and Accessory Notes

• Thread: M28.5 x 0.6, for 1.25″ eyepieces, diagonals and nosepieces.
• 2″ version: SVBONY also makes it in 2″ (F9165B, M48 x 0.75).
• Variable dimming: a single linear polarizer gives a fixed reduction. Pairing two polarizers and rotating one against the other is the usual way to get adjustable dimming.

Good to Know Before You Order

• Automated cameras: SVBONY notes these filters are generally not suited to highly automated digital cameras, whose metering and autofocus can be affected by polarized light.
• Not a solar filter: it is for the Moon and planets only.
• Weight: SVBONY does not publish a weight for this filter.

Frequently Asked Questions

Is it difficult to set up?

No. It threads by hand into the filter thread of a 1.25″ eyepiece or diagonal.

How is it different from a moon filter?

A blue moon filter adds a colour tint. The polarizer uses neutral glass, so the Moon's colour is unchanged.

Can I use it for imaging?

Yes, for lunar and planetary imaging with astronomy cameras. Highly automated consumer cameras may not meter correctly through it.

Bottom Line

In short: a 1.25″ M28.5 linear polarizer with neutral optical glass in an aluminium cell, for glare-free, natural-colour views of the Moon and bright planets.