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It is for visual use Bill, mainly with my C11. It will also reach focus with some refractor/eyepiece combinations depending on available back focus and position of the eyepiece field stop.
Orion does not market this filter wheel for visual use but when I started looking around at the dizzying array of adapters I realised it could easily be used visually.
There are a few different diagonals the wheel can be attached to or you can get a 2" eyepiece holder from Agena Astro.
I'd been thinking about a filter slide/wheel for my nebula filters but wasn't happy with the Lumicon version since the filters are not enclosed.
It's very nice to be able to quickly change between UHC/OIII or no filter.
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