It's standard when using reflectic/catadioptic objectives to peek back at where the satellites are: https://www.astroshop.eu/filter-wheels-filter-sliders/starli

It's standard when using reflectic/catadioptic objectives to peek back at where the satellites are: https://www.astroshop.eu/filter-wheels-filter-sliders/starlight-xpress-usb-filterwheel-7x-1-25-t2-t2/p,23748 https://www.astroshop.eu/filter-wheels-filter-sliders/starli... This one has USB, the same style with manual operation via a teethed wheel is like 169 EUR at that shop. Or consider rigging a burnt-out DLP projector's filter wheel up, which comes with a motor and encoder that you could use to capture imagery with the filters they provide at much higher frame rates (a few hundred fps in the monochrome domain seem usual these days, AFAIK, for good consumer DLP projectors).