70mm Optical Focal Length 50 90cm Double Dissociation Convex Lens DIY Astronomic Telescope Collimator Objective Guidscope Lentes
![70mm Optical Focal Length 50 90cm Double Dissociation Convex Lens DIY Astronomic Telescope Collimator Objective Guidscope Lentes](http://ae04.alicdn.com/kf/H8abcbca4005a4ad191464390e97bb21dq.jpg)
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