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Explore Scientific 2x Barlow - Focal Extender 2"

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in In stock (2)
0.40 kg
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including VAT 20.00 % ( £23.00 )

Explore Scientific 2x Barlow - Focal Extender 2"

The Explore Scientific 2x Barlow - Focal Extender 2.0" is an excellent choice for those wanting to extend the equivalent focal lenght of their telescope for both visual and imaging purposes.  

Traditional Barlow lenses magnify by converging the lightpath passing through them. This inevitably leads to a certain amount of inaccuracy around the edges of the field, which while often livable with tend to spoil the views or images taken through them somewhat.  Although Explore Scientific describe this particular unit as a Barlow, it is actually a more advanced true Tele Extender design, which encorporates two sets of two optical elements: one which magnifies and one which corrects the light path through it to a much more paralel one than is possible with a traditional Barlow design.  This telecentric optical design delivers excellent image sharpness over the whole field of view (which is flatter as a result) and are subsequently premium choices for visual observations and astrophotography. The combination of excellent fully multi coating with superior optical design makes the Focal Extenders superior to classic Barlow lenses.  Unlike Barlows, the Telecentric design preserves eye relief characteristics of eyepieces, providing much more comfortable views, when compared to Barlow desings which tend to reduce eye relief by a factor of their magnification.

Please note: due to the comparitively long length of the Explore Scientific 2x 2" Barlow Focal Extender's nosepiece, it is sometimes neccessary to use a 2" 80mm extension tube to get proper fitting in some telescope's focusers and diagonals.  We recommend the Revelation 80mm Extension Tube for these situations.



Suitable for visual observations and astrophotography

Doubling the effective total focal length of the telescope
Four lens telecentric design
Fully multi coated
Filter thread for color or nebula filters with superior optical design makes the Focal Extenders superior to classic Barlow lenses.

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