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Primaluce Lab APO 2x Tele-Extender for APO Telescopes

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0.90 kg
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The Primaluce Lab 2x APO Tele-Extender is inserted between the telescope and the camera, allowing you to double the focal length of the instrument. Using this accessory the image is 2x magnified: for example, using a telescope with 600mm focal length, the focal length becomes 1200mm. This instrument is therefore essential to increase the magnification without losing too much brightness for bright astronomical subjects as the Moon or the Sun (warning: photograph and observe the Sun only with  proper filters) or terrestrial subjects, for example in nature photography.

Thanks to the special construction with 3 optical lenses, this 2x APO extender keeps the contrast and the original image definition without introducing aberrations or spurious colors.

The 2x APO extender comes with a female T2 thread at the front (telescope side) and a male T2 thread at the back (camera side). In order to connect to a telescope, you simply need to add a normal T2 adapter (unless there is already a T-thread at the end of the drawtube of the focuser. In order to connect cameras to it, you need a T2 ring if you use a DSLR camera or you can directly connect a CCD camera if it has in front a T2 female thread.

Note: the requested backfocus distance for this extender is 55mm. For DSLR cameras, this distance is normally achieved by positioning (between the extender and the camera body) a normal T2 ring (for example Canon EOS DSLR sensor is normally placed at 44mm from the front bayonet and the T2 ring is usually 11mm thick). The CCD cameras instead have the sensor placed forward so, if you want to connect them directly to this extender, it will require a T2 extension. For example, since the CCD ATIK 428EX or 460EX have a back focus (distance between the sensor and T2 front thread) of 13mm, you'll need a 42mm T2 extension (55mm - 13mm) to bring the sensor to the proper working distance from the field flattener.

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