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» Support Center » Knowledgebase » The NexStar 114 SLT has a 1000mm focal length. Why is its tube only 508mm long? Is this a mistake?
 The NexStar 114 SLT has a 1000mm focal length. Why is its tube only 508mm 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: 2302
Created On: Oct 21 2009 01:38 PM

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