A Tele-Extender is a type of Barlow lens which does not change magnification factor if you change the distance between the eyepiece or camera and the Tele-Extender lens unit. Th is means a tele-extender is ideal for consistent astro-photography imaging if you add a filter wheel for example to the light path.
There are 4 models (three 1.25" and one 2" ) to choose from :
- 1.25" 2x
- 2" 2x
- 1.25" 3x
- 1.25" 5x
These Flat Field Tele Extender's 4-element optical design minimises field curvature, and allows for excellent colour correction. This makes them particularly suitable for high resolution lunar imaging, making mosaics easier to match at the edges with less distortion, and offering better colour correction over as much of the field as possible.
From a visual perspective, most high power eyepieces have short eye-relief (i.e. the distance between eyepiece and eye), making them difficult to use with eyeglasses and less comfortable generally. However, with these units, you can use low power eyepieces at high power, while maintaining the same eye-relief.
Premium glass and top quality broadband multi-coatings on all surfaces, along with blackened interior elements ensure the ultimate in image contrast.
An ideal accessory for high power lunar, solar and planetary observation and imaging, the resulting images speak for themselves.
All models are threaded to accept filters and have a brass compression ring and outer rubber grip.