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» Support Center » Knowledgebase » What are the optimum back focus distances for Celestron’s Schmidt-Cassegrain (SCT) telescopes?
 What are the optimum back focus distances for Celestron’s Schmidt-Cassegrain (SCT) telescopes?
Answer The back focus distances are as follows:

SCT TelescopeBack focus distance from primary mirror baffle tube lock ring (inches)
C 55.000
C 65.000
C 85.000
C 9.255.475
C 115.475" from 3"-2" Reducer Plate 
5.975" from 3" Primary Mirror Baffle Tube Lock Ring
C 145.475" from 3"-2" Reducer Plate 
5.975" from 3" Primary Mirror Baffle Tube Lock Ring


Please see the EdgeHD FAQs for corresponding numbers for that optical design.



Article Details
Article ID: 2645
Created On: Nov 05 2012 11:35 AM

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