1.35x Visual Field Flattener

I hope this should be good news for BORG visual observers if works as expected. Harry Siebert has made his best efforts to more optimize his 2″ 4-element telecentric barlow for BORG F5.6 optics. Here is 1st unit.

This is a basically 1.35x barlow. But I’d like to describe it as a field flattener for the purpose of improving the focal plane rather than the magnification.

I don’t have various 2″ eyepieces. But I will try to test as many as possible. I wish to see it makes the curvature of field better at BORG F5.6 optics. Let’s see.

 

 

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~ by tedishikawa on June 4, 2018.

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