On the general notion of push/pull lenses I have an old Nikkor 80-200mm push/pull and much prefer it [I had a 100-200mm Canon that worked the same way many years ago so knew how they felt before buying the Nikkor]. I agree with Robski - I always tended to use the same method with my 135-400mm when I was trying to change length quickly. Yes - the clunk can be off putting - I try not to dangle the lens downwards!
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