accordingly the label . Plus Barlow lens
Baike card
Barlow is simply a concave mirror placed back the objective lens focal width extension factor in mandate apt distend the abbreviate . However, note that the picture quality will deteriorate .
common popularity with Barlow lens telescopes are the most mutual is three times the Barlow Lens ( Barlow lens ) of the basic principles of Peter Barlow is a nineteenth century British physicist and mathematician , he was the 1st use of a negate lens (negative lens) to addition the telescope ’s magnification capability , for shown underneath , hence the name . Plus Barlow lens , the entire optical alignment of the efficient focal length (also known as synthetic focal length ) is F ‘(B / A). B / A , also known as Barlow lens exaggeration . Barlow lens magnification is with ? Its positioning (distance A) alterations , example: set the focal length Barlow f = 50 mm, A = 25 mm. Imaging distance must be B = f ‘A / (f – A) = 50′ 25 / (50 – 25) = 50 mm magnification = B / A = 50 mm / 25 mm = 2 times the set f is still 50 mm, yet A increased to 34 mm. Imaging from B = 50 ‘34 / (50 – 34) = 106 mm magnification = B / A = 106 mm / 34 mm = 3.1 times whether the objective lens focal length is 1000 mm, and the barlow behind the effective focal length to 3100 mm . There is a Barlow lens , focal length f = 2, the provisions of imaging from B to 6 . Barlow lens rank must be A = f ‘B / (f + B) = 2′ 6 / (2 + 6) = 1.5 magnification = B / A = 6 / 1.5 = 4 times , Related entries :
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