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Hi John,
I don't think that strategy will work. The guide cam sensor and the imaging camera sensor must be the same distance from the OAG prism for both cameras to achieve focus.
If you inserted the 0.63 reducer before the guide cam it will push the sensor too far away from the prism and you will not get it into focus.
In theory if you added a spacer in front of the imaging camera that is the same length as the focal reducer you may be able to get both cameras to come into focus. All depends on how much inward focus travel your focuser has.
As to your question the focal length will be 3556mm x 0.63 = 2240.28mm
Cheers
Bill
Last edited by billdan; 23-02-2019 at 02:29 PM.
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