+1 for the Neumann filter drawers from me.
I have the T thread attachment version with both 2" and 1.25" filter holders.
Great to set up the transmission grating and then switch over to the Cousins photometric V filter.
(Just one note of caution: With the Neumann 1.25" filter - the mounting thread seems to be at odds with a lot of the standard filters around, a bit of a hit and miss at times....)
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