Borg fluorite apochromatic refractor 55FL f3.6 PLUS, 55mm diameter, 200mm focal length (f3.6), 6 elements fluorite apochromat with Canon lens, aluminum tube with 50,8mm Feather Touch focuser with fine focus knob, rear thread for camera connection, PLUS support rings.
Borg fluorite apochromatic refractor 55FL f3.6 PLUS offers optical power, mechanical quality and design features at the highest levels, all in the most compact and easy to transport telescope. It's the perfect instrument even for travel. Thanks to 6 elements fluorite optics with field flattener, it's the best for wide field deep-sky astrophotography with camera's sensors up tu Full Frame!
6 elements fluorite apochromatic design, 55mm f3.6, perfect colors
Borg fluorite apochromatic refractor 55FL f3.6 PLUS uses 6-element fluorite optical design for a perfect chromatic aberration correction, generating images without false colors, contrasted and rich in details, in a large 43mm flat field to obtain pinpoint stars even with Full Frame sensors (24x36mm). Optimal back focus is 60mm from M57x0.75 female thread on the back of the focuser. The short focal length (200mm) and the fast focal ratio (3.6) make it ideal for shooting wide field extended objects.
50,8mm Feather Touch micrometric focuser
Often refractors are provided with focusers suitable only for visual use but not for photo applications. In fact, during the long exposures required by astrophotography, this type of focuser can cause camera slippage moving the sensor out of focus. For this reason Borg fluorite apochromatic refractor 55FL f3.6 PLUS comes with Feather Touch focuser that offers high load capacity, great focusing precision (thanks to a convenient 1:10 fine focus knob) without backlash: this is the perfect focuser for Primaluce SESTO SENSO robotic focusing motor! The focuser has a rear M57 thread to connect cameras by adding the proper photographic adapter.
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