creepy.sol
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Is this actually a problem with rf lenses?
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NoTicket
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creepy.sol
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Hmm, not sure what happened. Basically, guy contends that he knocked over his camera on a tripod, lens didn't hit ground evidenced by no scratches or dents to the lens...nevertheless, the lens snapped in half. The reviewer argues that there's build quality problem.
Do others feel the same? Ive never broken lens and have never dropped or knocked over a camera. Not sure if we should expect lenses to survive waist or higher falls.
NoTicket
Well-known member
What is the title of the video?
Generally speaking I am not sure I understand how the lens could break in half?
So which lens was it? Obviously they are all of different construction, so why would you think it would apply to all of them?
The fact (if it is a fact) that the lens did not directly strike the ground says nothing about how the momentum of the lens and the vector of its momentum when the camera/lens unit struck the ground might affect its construction.
Your neck could be broken in an auto accident without your head having struck anything.
frisbfreek
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Exactly this. I wouldn’t expect to not break a body part if I fell that way unbraced, so I wouldn’t expect my lens to survive unscathed either.
Hoka Hey
Senior Member
There was an old YouTube by a guy who CLAIMED that a rented lens was broken when the tripod he had left out on a windy day blew over and the rig hit the frozen ground. It was discussed thoroughly in a previous thread.
If you look closely at the video, it looks fishy. The edits were funky and left the appearance that the Youtuber didn't show what really happened.
You can look up the old thread for more details.
Thomas A Anderson
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I won’t give you an education, but an understanding of momentum, gravity, potential energy, and radial motion would help.
This sounds like the same video discussed here months ago. The lens has a very rigid attachment to the body. Since the body is a shell of magnesium it won’t absorb much impact. While the lens itself may not have impacted the ground it certainly experienced a high deceleration when the camera struck the ground. Just like the people in a car crash may not make contact with the other car, they still feel the sudden change of velocity. Arguing the lens is weak for failing in the absence of an impact is like saying the people in a car crash should always hop out of a wrecked car and stroll away like nothing happened.
Thomas A Anderson
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Same video discussed ages ago. The wind imparts enough momentum to topple a tripod. Then gravity accelerates. That wasn’t just a drop from 6 feet, it was like throwing it down from six feet. Very few lenses would have survived unscathed, if any.
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NoTicket
Well-known member
I agree that I would expect damage.
The two times I have had damage to lenses was in much less severe circumstances. Both were when I left my camera bag somewhere and it ended up falling on the ground. In this case the lenses both became decentered and had to be serviced.
Now, the lens mount / spacer breaking away from the lens is sort of new. If you look at Roger Cicala's teardown of the RF 50mm f/1.2 you can see that the spacer attaches to what appears to be the plastic rear shroud. https://www.lensrentals.com/blog/2018/12/disassembly-of-the-canon-rf-50mm-f1-2l/
This does seem like it would make it more likely for the type of failure in the YouTube video to occur.
This doesn't really bother me though. It should also be relatively inexpensive for Canon to repair.
I would expect some sort of damage to occur if I had this happen, whether it was internal or external to the lens.
shawnphoto
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There are stories that go both ways. Sometimes a camera gets dropped off a cliff and survives. Sometimes it falls a couple feet onto the floor and breaks.
In this case it looks like the entire lens assembly is intact. I doubt that is a coincidence. Something has to give somewhere. If the impact is hard enough it will break no matter what its made of.
PhotoKhan
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