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The Lumicon 1.25" Multiple Filter Selector goes in to any 1.25" focuser and accepts 1.25" eyepieces or SLR cameras, but also has a built-in sliding tray which gives users quick access to up to five 1.25" filters. It is very common to leave one of the 5 slots open, so that you can compare the naked view/image with various filtered views/images. There's a 1.25" female filter threading on the nosepiece of the device as well, and the top of the device has a standard T-mount threading in addition to the 1.25" inner diameter tube to accept 1.25" eyepieces.
As with any filter selector, this device does add some length to the optical path. It is not a problem with a catadioptric scope, but users of refractors or reflectors with scarce in-focus path length upon the focuser may not achieve infinity focus without the use of a barlow lens. In imaging configuration this device is quite low profile, only adding ~22mm of path length, so achieving focus won't often be a problem when making pictures.
Sliding tray accepts up to 5 filters
Inserts in to 1.25" focusers
Accepts 1.25" eyepieces (simple set screw coupling)
Built-in T-mount adapter allows imaging (adds ~22mm of path length in imaging use)
Optionally available Expansion Kit doubles capacity