Home Focusing by Astro-Physics Threaded 2.7" Extension with Internal T-thread (A3511)
Threaded 2.7" Extension with Internal T-thread (A3511)
Threaded 2.7" Extension with Internal T-thread (A3511)

    Astro-Physics

    Threaded 2.7" Extension with Internal T-thread (A3511)

    $ 60.00
    $ 60.00

    This item is out of stock but you can place an order now and we’ll ship when it becomes available.

    Realize the full potential of your Fluorite Flatfield Converter (BPFFC) or 2" Convertible Photo-Visual Barlow (BARCON) when imaging by using this extension. The internal T-thread on this extension allows you to attach your BPFFC, BARCON or other accessory with male T-threads INSIDE the 2.7" extension tube. In this way, the camera, filter wheel, off-axis guider, and/or other accessories are all supported by the much more robust and rigid 2.7" tube system, and the Barlow only needs to support its own weight inside the extension tube. This is particularly important when imaging at some of the higher magnification factors achievable with the BPFFC where over a foot of extension may be used between the Barlow optic and the focal plane. The maximum OD of the T-thread accessory is 2.5". Please see this A3511 System Chart for component options.
    This 2.7" extension has a net spacing distance of 0.75" (19.05 mm).

    It has a net spacing distance of 0.9" (22.86 mm) for the internal optic.

    Personal Upgrade Path

    Buy risk-free: When it’s time to trade up you’ll get the most value for your used gear.

    Learn More