The Baader Planetarium FND2-1 filter comes as a ND 1.8 and is housed in a 1.25" Cell. This Baader Planetarium Neutral Density Filter is a step above the rest as it pertains to quality and in return you get a superior performing product.
Baader Planetarium FND2-1 Features
The Baader Neutral Density Filter threads on to 1.25" Eyepieces and Diagonals
Baader Neutral Density Filter made with Baader Premium Materials and Fully Multicoated