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I use the Starizona filter slider with the 294. It is 19.5mm plus the 6.5 of the 294 with the 11mm spacer removed . Starizona says that is exactly the back focus required and it works well.
That extra 4mm on the 294 is thread and gets taken up as part of the filter slider dimensions. So if Celestron recommends 25, Starizona combination is 26
For the 224, I use the 12.5 - 17mm variable spacer at 12.5 which takes it to 25mm with the 12.5mm of the 224 camera
There is a lot of confusion out there .25mm, 26mm,27.5mm ,29mm ??. 25 and 26 work so I stick to them.
cheers
Paul
Last edited by lollywater; 21-10-2019 at 01:06 AM.
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