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  • ASKAR M54 to M54 Backfocus Adjuster

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    ASKAR M54 to M54 Backfocus Adjuster

    In daily astronomical shooting, the backfocus will have an influence. Astronomical photographers are often frustrated by the change of backfocus due to various reasons such as refraction of filters or when using some products with sensitive backfocus. To solve this problem, ASKAR launched the backfocus adjuster, (providing the adjustment range from 16mm-20mm), which can be adjusted ± 2mm of the backfocus. We offer two specifications for the backfocus adjuster, the camera side adapter M54 and M48, which are convenient for users to choose from.

    Please note, this product is available in two different sizes: M54 to M54 and M54 to M48.
    This product description is for the M54 to M54 version, but the desciption covers information about both versions.

     

    The M54 backfocus adjuster's front telescope interface is female thread M54x0.75 and the rear camera interface is male thread M54x0.75, the overall thickness is 18mm and offers ± 2mm adjustment range.

    The M48 backfocus adjuster's front telescope interface is female thread M54x0.75 and the rear camera interface is male thread M48x0.75, the overall thickness is 18mm and offers ± 2mm adjustment range.

    The backfocus adjuster is CNC machined. Each unit is a 0.05mm precision adjustment, the surface is printed with a scale for easy adjustment and to save the position. There are two holes for fixing screws, which make the adjuster easy to use with different products.

    By rotating the backfocus adjuster, it can be adjusted between ±2mm to match the backfocus requirement, and to solve the various imaging problem caused by the backfocus.

    Users just need to choose according to their product's rear adapter.

    Product Size Diagram

    M54 to M54 Bckfocus Adjuster

    M54 to M48 Backfocus Adjuster

     

    M54/M48 Backfocus Adjuster Installation

    For Askar APO series:

    For Askar V series:

    Video

     

    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)

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    Estimated delivery time is displayed at checkout.

    See our shipping policy for more details.

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    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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