BORG 67FL F3.8

67FL F3.8 is one of fastest speed and shortest focal length among BORG astrograph family.

b067038ftfsB06738, shown with an optional FTF-M57

Although it doesn’t cover full frame sensor, it achieves clean and pinpoint stars entire APS-C sensor. So it should be the best match for wide-field astrophotography with small sensors like SONY 694 and 814 chips.  BORG’s F3.8 should work like the conventional telephoto lens’s F3.3 or faster in speed. If speed, sharpness, color contrast and transparent background are important factors for you. this is the one.

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~ by tedishikawa on March 7, 2015.

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