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Em,
I’d love to help, but my experience is with modded Canon cameras.
The Canon has two inbuilt filters, one is a colour correction (this is the one usually removed to improve the chip sensitivity to red and Ha). The other front filter, in the Canon is an Anti-Alias/ dust shake filter.
The set-up I use has both these filters removed for the spectroscopy work I do.
When one or more of these filters is removed, it means that the standard photographic lens would focus at infinity.
The solution is to either replace the removed filter with a clear alternative, or add a Clip-in clear filter.
I don’t know what the equivalent arrangement is for your camera.
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