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Old 02-08-2020, 11:40 PM
Gadget4x4 (Peter)
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Celestron CPC1100 back focus distance.

Hi everyone. just after a bit of help. I'm trying to find the correct back focus distance from the outer edge of the baffle lock nut to the camera focal plane.
I know for the CPC1100 EdgeHD it's 146mm, but don't know if it's the same for the standard CPC1100 GPS.

Any help appreciated.
Cheers
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Old 22-09-2020, 03:31 PM
Ittaku (Con)
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Funnily enough celestron have it on their website and then talk about looking up the edge HD FAQs for their unique values, but they're actually nowhere on their site (you probably found them in a separate blog like I did). Here is the reference for the regular OTAs:
https://www.celestron.com/blogs/know...celestron-scts
In inches it's as follows:

C11 5.475 in from 3 in-2 in Reducer Plate
5.975 in from 3 in Primary Mirror Baffle Tube Lock Ring
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Old 27-09-2020, 11:39 AM
Gadget4x4 (Peter)
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Hi Con - thanks for the reply. Your correct - found in a blog. Same measurements as you have stated -

Cheers Peter
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