LNIB Sirius MV20 Minus Violet Filter 1.25" Now $35 (New is $49 plus shipping)
The MV20 filter was designed with a more neutral appearance in mind. The mid-priced achromatic refractors would do well with this filter.
The MV20 is still very aggressive in its rejection of the unfocused violet and deep blue found in typical refractors. This is accomplished by additional rejection of the yellow region to balance color rendition.
Unlike the MV1, the MV20 does not reject the IR region.
(stock photo shown)