1.25" Double Helical Focuser+inner T adapter

1.25 inches Double Helical Focuser High Precision for Telescope Finder Guidescope with Brass Compression Ring (M42x0.75)

• With a 10 mm focusing stroke; miniature focusing is more accurate and clear;and the focusing accuracy can reach 0.1mm;Smooth even at great magnification
• 1.25" inner diameter with two M3 non-slip handle screws Top T2 external thread (M42*0.75mm) and the bottom is T 2 internal thread (M42*0.75mm)
• The brass ring design at the interface not only provides an effective hold but also protects your eyepiece or zenith mirror or CCD eyepiece from scratches
• High-strength aluminum alloy material increases the durability of the product.Surface matte and black anodized;effectively reducing light loss, making it more textured
• The eyepiece or zenith or CCD inserted during the focusing process remains non-rotating; and only linear motion is beneficial for observation and shooting