卖全球光學 GSO 2'' Refractor M-CRF Crayford 線性滑軌調焦座(折射鏡用)最好的价格

• Minimum focuser height (with 1.25" adapter and base flange) = 121mm (4.76”) • Maximum focuser height (with 1.25" adapter and base flange) = 200mm (7.87”) • Minimum focuser height (without 1.25" adapter but with base flange) = 111mm (4.37”) • Maximum focuser height (without 1.25" adapter but with base flange) = 190mm (7.48”) • Tube travel = 79mm (3.11") • Focuser weight (with 1.25" adapter) = 1lb-14.4oz (861gm) • Focus knob diameter = 40mm (1.57") • Microfocus knob diameter = 26mm (1.02”) • Laser-etched scale markings on focuser drawtube: Yes • Rotatable: Yes (but see description above) • Dust plug: One 1.25" dust plug included