Personally I think it's a scandal and all affected lenses should be good-willed by Canon. I had a similar issue with some Ray Ban P sunglasses. The coating just fell off and needless to say they became useless. But that was like $100 and I didn't think much of it (except that I was annoyed).
Personally I think it's a scandal and all affected lenses should be good-willed by Canon. I had a similar issue with some Ray Ban P sunglasses. The coating just fell off and needless to say they became useless. But that was like $100 and I didn't think much of it (except that I was annoyed).
A state-of-the-art $3000+ lens? No way...
Yikes! That link has me concerned about the longevity of my 28-70.
I wonder if it's a bad batch problem? Or incorrect production for a period of time before it was silently addressed? I mean, I've owned my copy of the 200-400 with fluorine coating on the front element for 11 years and it has been fine. And I don't baby it. My EF 85/1.4L IS has also been fine and I've had it since initial release in 2017. I bought my 28-70 almost two years ago and has also been OK. But I don't know how long it had been sitting on the store's shelf (the box was somewhat dusty, haha).
I had this problem with my 28-70 when trying to clean it with a microfibre cloth. The lens coating on these is fragile. There's a reddit thread every few months on it.
Canon's RRP at the time was around AU$1k for the replacement lens element. I'm too scared to clean mine again.
just at a glance, it looks like this lens has been thru hell and exposed to the elements a LOT, and is retaining a LOT of dust/debris/sand all over the lens; my guess is your cloth had a lot of this sediment already on it and wiping it actually etched/scrubbed this blemish into it or something. not once have i seen a canon lens obtain a sizable/non-removable mark by simply wiping it with a clean cloth. its possible if this lens has spent its life at the beach, that over the years the salt water mist has deteriorated the coating. again, it would take a lot for this to happen, but this lens does not appear to have had a good/careful life tbh.
other way you can get marks like this is when you toss the lens in a bag with other loose components in the bag. by jostling/walking around the other random bits in the bag end up leaving a mark on the glass elements. hard to believe this happened simply by just wiping it.
if this is a coating issue, I'd 100% be speaking with Canon about it, for it would be a clear flaw in the manufacturing. If it were a $300 off-brand/3rd party lens you might expect something like this to occur, but this being literally one of the most flagship lenses Canon has produced, I'd imagine they would work pretty hard to make sure this was taken care of, assuming it was an issue with coating.
I am the owner of the Swedish webpage listing the defective 28-70/2 samples. May I use your image and add it to the collection?
gooby wrote:
I bought this lens off a friend a few weeks ago. Today I went to ship it to a buyer and was cleaning it up as I do with all lenses before I ship them. There was a tiny tiny mark on the side of the glass so I took a microfiber glass cleaning cloth like I always do on lenses and started cleaning it. It started to spread and smudge presumably the coating on the glass. I have never seen this before. I had to refund the buyer and admit that I messed up the lens. Is this repairable? Will it affect image quality? I did nothing but use a microfiber cloth and it really did a number on this coating quickly. Never seen anything like that. Any ideas?...Show more →
Do I already have your picture on my webpage? If not, do you have one from your lens that I can use? EvilZardoz wrote:
I had this problem with my 28-70 when trying to clean it with a microfibre cloth. The lens coating on these is fragile. There's a reddit thread every few months on it.
Canon's RRP at the time was around AU$1k for the replacement lens element. I'm too scared to clean mine again.
On a slightly more positive note, Canon do supply parts and I've managed to find out how to replace the front lens group, which made it a little less painful.
