I had Keith Morris in the UK make me up a Bahtinov for the FSQ106ED for f/3.65 - naturally, the slits are a LOT narrower than say an f/5 or larger f.
If I were to use the same Bahtinov on the Fl102S, at f/6.3, will there be any detriment, apart maybe from having a VERY faint pattern to focus on? (it was quite faint at f/3.65 until you zoomed drastically in the preview images)
Or just have him make another?
BTW, his Bahtinovs are superb - hard acrylic, that do NOT flex and deform unlike some mass produced ones, which I suspect MAY make the focus a little more precise?