Nikon EiC-16 converter lens
Specifically optimized for Nikon NAV SWs, the EiC-16 provides a 1.6X tele-extension for the NAV SWs, with even more enhanced field curvature and astigmatism suppression. Can also be used with other makers eyepieces, 1.25" size.
the NIKON Barlow has a teflon clamping ring to lock securely the eyepieces. The 1.25" Barrel has a 1.25" Filterthread ( M28.5 x0.5), the barrel is starting with a diameter of 30.8 mm = 1.21 inch for a lenght of 21 mm, then it converts into 31.75 mm = 1.25" for a length of 24 mm.
So if you will use this NIKON Barlowlens in a 1.25" stardiagonal, please make shure that the insert length is deep enough.
The original barlow for the Nikon NAV SW eyepieces. Also useable for all other 1 1/4" eyepieces.