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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.
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 our SESTO SENSO robotic focusing motor! The focuser has a rear M57 thread to connect cameras by adding the proper photographic adapter.
Forget about the uncomfortable and weak support rings that are often found in cheap telescopes! Borg fluorite apochromatic refractor 55FL f3.6 PLUS comes with our PLUS (Prima Luce Universal System) rings, aluminum, made with high precision CNC machines. This gives you maximum freedom in connecting other mechanical accessories (dovetail plates, guide rings, dovetail clamps) always with simple M6 screws and with 2 screws for every element (to avoid flexures). This way you can also connect the EAGLE directory on the telescope obtaining a fantastic system for astrophotography that does not require external computers to allow you to perform great quality astrophotography!
|Optics||6 elements apochromat|
|Focal Length (mm)||200mm|
|Field flattener/corrector||Included and removable|
|Focuser||50,8mm Crayford, micrometrico|