How lenses are made

I think they reduced the number of internal lenses with the latest Series II models which made them lighter on the hand but heavier on the pocket. :o

My 400mm is currently resting up in it's hermetically sealed coffin for the week ahead.
 
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I think the most part is the 1000 pond per KG for the lens glass

I did add a link to the longest canon lens ....
 
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