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Wex Photo Video£27.99Visit shop OVL - Variable Polarising Filter - 1.25 Inch - Aluminium
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This OVL Optical Vision Variable Polarising Filter is for amateur astronomers seeking to enhance their observation of bright celestial objects like the Moon and planets. Its key benefit is the ability to progressively dim the view, reducing glare and increasing contrast to reveal more detail, with a light transmission range from 40% down to 1%. A minor caveat is its specific 1.25-inch fitting, requiring compatibility with your telescope's focuser or diagonal.
| Brand | OVL |
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Its primary use is to reduce the brightness of very bright celestial objects like the Moon and certain planets, which in turn increases contrast and reduces glare, allowing for more detailed observation.
The light transmission can be varied progressively from 40% down to as little as 1%.
No, the filter is designed to be color-neutral and will not alter the natural color of the object being viewed.
The filter screws into the barrel of a 1.25-inch eyepiece or a 1.25-inch star diagonal.
No, this filter is specifically designed for 1.25-inch accessories. For 2-inch accessories, you would need a 2-inch compatible filter.
Gently brush off dust with a lens brush. For smudges, use a dedicated lens cleaner and a microfiber cloth, applying it to the cloth, not directly to the lens.
This filter is designed for bright objects. It is not intended for, and will likely hinder, the observation of faint deep-sky objects as it reduces overall light transmission.
Ensure the filter is screwed in completely. Rotate the outer ring to find the position that maximizes contrast. The effect is progressive, so slight adjustments may be needed.
Check that the filter is screwed in straight and flush. Ensure no other accessories are interfering with the light path. In rare cases, very slight tilting of the filter may be necessary.
Confirm that the filter is clean and free of smudges. Also, consider atmospheric conditions (seeing) and the magnification being used, as the filter's effectiveness is complementary to these factors.
Setup: This filter screws directly into the threaded opening of a 1.25-inch eyepiece or a 1.25-inch diagonal. Ensure the filter is securely attached before beginning your observation.
Compatibility: The filter is designed exclusively for 1.25-inch astronomical telescopes, eyepieces, and accessories. It will not fit 2-inch eyepieces or other larger format equipment.
Care: To clean the optical glass, use a soft lens brush to remove loose dust. For smudges or fingerprints, use a lens cleaning solution specifically designed for optical lenses and a microfiber cloth. Always handle the filter by its edges to avoid transferring oils from your skin to the glass. Store the filter in its included carrying case when not in use to protect it from dust and damage.
