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» Support Center » Knowledgebase » The 114LCM has a 1000mm focal length. Why is its tube only 450mm long? Is this a mistake?
 The 114LCM has a 1000mm focal length. Why is its tube only 450mm long? Is this a mistake?
Answer

 No. The reason the tube on this scope is so short is because its optical design incorporates a Barlow lens built into the focuser. This lens extends the focal length of the primary mirror and therefore the telescope without adding physical length.

The result is a compact tube Newtonian reflector with a long focal length.



Article Details
Article ID: 2432
Created On: Oct 29 2010 06:23 PM

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