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The Extension Ring have length of 4mm,5mm,6mm,7mm,8mm,9mm.10mm.15mm.20mm
Outer diameter: 60mm
pitch：0.75
male thread length: 3mm
4mm-female thread length is 3mm
5mm-female thread length is 4mm
6mm-female thread length is 4.5mm
7mm-female thread length is 5.5mm
8mm-female thread length is 6mm
9mm-female thread length is 7mm
10-20 mm female thread length all is 8mm
Astronomical Telescope Accessories M54-M54 Telescope Filter Drawer (with Two Filter Slider) Visual Photographic Filters Drawer (Color : 2 inch Drawer-Set)
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Astronomical Telescope Accessories 10pcs/Set M6 Astronomical Telescope Locking Screws Stainless Steel for Dovetail Mounting Plates (Color : 16mm 10pcs)
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Astronomical Telescope Accessories 1.25" Telescope ND Filter Neutral Density Fader Optical Glass for Astronomical Telescope Photography (Color : ND4)
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