Kilfitt Makro-Kilar 90mm f/2.8 對焦環轉動不順 重新潤滑 Lubricating for the stiff focus ring/focus helicoids

這支 Kilfitt Makro-Kilar 90mm f/2.8 的對焦環轉動手感很緊，拆解、清洗對焦螺紋後，再使用適合的潤滑油脂 重新潤滑

The focusing ring of this Kilfitt Makro-Kilar 90mm f/2.8 rotated very stiff made it hard to use. By disassembling, cleaning the focusing helicoids and lubricating with proper grease, the problem can be totally solved.