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  • Optolong Clear Focusing Filter 1.25"

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    Optolong Clear Focusing Filter 1.25"

    The Optolong Clear focusing filter is designed to pass through the visible spectral region between 420nm and 680nm at a high transmission level of 98.5%.

    Clear Focusing Filter Introduction

    Main Use

    Use of astrophotography filters, especially narrowband filters, often result in dim images which can be difficult to focus. Clear focusing filter can be used first to clearly focus the image as it lets through practically all the light in the visible spectrum.

    Use with modified DSLRs for higher efficiency and sensitivity by passing visible range with 98.5% transmission.

    Act as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.

    WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

    Clear Focusing Filter Spectrum and Characteristic

    Substrate: B270
    Thickness: 1.85mm
    Tave:  T>98.5%
    Surface quality: 60/40
    Transmitted Wavefront RMS: λ/4
     Parallelism: 30s

    Notes

    ●About color: due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. Detailed color is in accordance with the final product.

    ●About coating: the interference filter will show different colors under different light, which is a normal phenomenon. Please refer to the material specification.

    ●About the description: the series of this product have the same material, technology and design, different sizes only, please note.

    As authorised dealers for all our products they come with a full manufacturers warranty along with our satisfaction guaranteed, no-questions-asked full refund policy for a full 30 days.

    Please see our returns policy for full details.

    We ship direct from UK warehouses and provide free shipping on all purchases within England, Scotland and Wales (Excluding highlands and Islands)

    We use UPS, DHL, DHL Express, Parcelforce or Royal Mail for all orders.

    Estimated delivery time is displayed at checkout.

    See our shipping policy for more details.

    Should you be outside the free shipping area then please contact us to discuss shipping options as prices vary depending on products and delivery location.

    Got questions? Read through our FAQ list to see if it's answered there! If not, please contact us via this form.

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