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The 22mm listed on our website is straight from the info at GSO. I haven't physically measured the travel but will do so tomorrow . If it is different from the 22mm listed the details will be updated.
We have had several people fit them to the GSO dobs and it allows focus with the 350/400D. Most of the GSO scopes come to focus with the eyepiece racked a fair way out...the 50mm low profile should allow access to the focal plane with most camera setups. As Davewaldo suggested the 35mm extension may be needed for visual use.
The other option is cutting the bottom off the tube but changing the distance between the primary and secondary mirrors means smaller fully illuminated field.
Michael
BINTEL
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