erichard wrote:
So is the answer to the protection filter, or no filter argument? Obviously, that filter absorbed most of the energy on impact. I keep a filter on, and take it off if necessary on occasion.
Dear Gawd, please don't start that one up again. In my book, that's what lens hoods and lens caps are for.
If you have rubber mouse pad (or any other rubber anything), lay it flat on the table rubber side up, press the filter flat against it and turn... should work.
The exact same thing happened to me, same filter, same diameter, except it was mounted on a 24-70 lens. If you are to remove this yourself:
In conjunction with some good/not so good advice I got here on FM, here is what I did:
1. Knocked in/out all little shards of glass possible - PASS
2. Tried to manually twist rim off, with hands - FAIL
3. Tried to place rim face against truck tire, for grip, and manually twist off - FAIL
By this point it was obvious that no unscrewing action of any kind could be performed - the threads were completely bound.
4. Got snub-nose pliers (wire cutting kind - like a beak) and clipped through one edge of filter profile
Kept clipping farther and farther in - careful not to go too deep
Now that the section of ring was minimal at one point, I used needle-nosed pliers to grip the ring, plier tip facing the lens, and twisted the mount counter-clockwise.
Slowly but surely, you twist enough that the ring starts collapsing on itself, to warp and start the formation of a "C" instead of an "O". At the point all the tension is off the threads, you simply bend the remnants of the filter ring in and then pull it out.
Have a beer after you get it off - You'll deserve it.
It's clear that the filter ring is deformed at the point of impact, so I would avoid any attempt to unscrew it, it may just damage the threads in the lens barrel further. If this were the result of my own mistake, I might try the collapsing method described above, but since this was done by a third party I wouldn't even bother. Just ship it off to Canon so it gets done right.
I'm generally a cheapskate/DIY kind of guy, but in this case I would not trust the lens even if you got the filter off. Who knows what kind of internal dmage is waiting to be found. Send it to canon, and bill your friend.
h_rearden wrote:
So, in your case the lens would have ended up with severe filter ring damage.
How would that be better than a damaged/stuck filter?
Well you wouldn't have to buy a new filter for one. The filter ring will be bent either way, if the filter is bent the filter ring will also be bent.
I can tell you something else, I dropped my 16-35 with a filter on it, and they changed the ring assembly but I got the filter back in one piece! It was stuck on the lens after it fell, but apparently it wasn't bent.
There is no reason for the owner to attempt further damaging the lens. The current damage is already covered by insurance it seems. If this is the case, just send the lens into Canon!
Azrael wrote:
...if the filter is bent the filter ring will also be bent.
That is not only a logic failure, but can also be shown to be untrue empirically.
I have removed many deformed bezels from watches, for example, where the corresponding section of the case was undamaged. I'm sure any auto mechanics here can tell of dented oil filters that have been forcibly removed from undamaged mountings.
And, yes, I have had to remove a deformed filter from a lens that I dropped. Mea culpa. (But the lens thread was fine.)
The lens may also be damaged, but it is not definitely so.
I would not claim something so small on insurance. You may be placed into a higher risk/higher premium category. Save the insurance for the bigger ticket items.
I would not claim something so small on insurance. You may be placed into a higher risk/higher premium category. Save the insurance for the bigger ticket items.
I would not claim something so small on insurance. You may be placed into a higher risk/higher premium category. Save the insurance for the bigger ticket items.
EB-1 wrote:
I would not claim something so small on insurance. You may be placed into a higher risk/higher premium category. Save the insurance for the bigger ticket items.
heh heh... I'm always known as stingy for not lending anything out. And this thread illustrates why I don't... even to close friends. I've had too much stuff get damaged or go missing, and dealing with a close friend in such situations can be harder than dealing with a mere acquaintance. Everyone has a different mentality when it comes to taking care of possessions.
I'm of the opinion that the lens should go to Canon. They might charge you for a new front part of the lens, so it'll cost at least $200. If all your best attempts have failed to get the filter off then you'll end up having used so much force if you do eventually get it off that chances are you'll strip the lens threads and not be able to screw another filter on.
My only suggestion would be to leave the lens in the sun for a few house to get it nice and warm, then bring it in and as it cools off try every 10 minutes to loosen the filter. If the filter ring is made of a different metal than the lens threads then they'll both expand and contract at slightly different rates, so you might get lucky and hit the sweet spot. I once dinged a filter on a Nikon lens. filter didn't break, but the ring was dented and I couldn't get it off. It was only a UV filter, so no worries... I just left it on. But about a year later I was able to simply unscrew it using no real effort. Go figure.
If it were my friend the *minimum* I'd hit him/her up for is half the repair cost and a couple drinks
If the lens was mounted on the 20D when it fell, and it hit hard enough to destroy the filter as shown, there's a good chance that the lens elements may not be in proper alignment or that the lens may have other damage that may not be apparent from an external examination.
I'd send the lens to Canon and ask them to not only remove the filter (they may have to replace the filter mount ring after doing so) but also to check the alignment and mechanics of the lens.
...and every cent of this better be covered by your friend!
- You'll deserve it.