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| p.1 #2 · Lens fitment question |
NO lubricant. It's actually normal for some lenses to be tighter or looser when going on. However, any change such as you are experiencing is abnormal. It may be nothing, or it may be big trouble. If it bothers you, send the lens to Nikon for a checkup; and investigation of why it suddenly requires far more effort to install/remove.