The Takahashi 1.5X Extender ED was created specifically for the . Thanks to the addition of extra low dispersion (ED) glass, you'll enjoy superb optical quality and enhanced correction. Now you can add focal length to your "Baby Q" to suit all your astrophotography needs. The Takahashi Extender ED has a 2" barrel and adds 1.5X magnifying power to all your eyepieces when used as a barlow lens. Takahashi Product Number: TEXDX0001 (replaces TKA31595)