Negative filter12/18/2022 ![]() ![]() I would also think that wider front elements (this is 82mm) might allow more play or sag in the center making this more likely.įor those of you who can’t wait to go post something about how the Canon 24-70 f/2.8 II has a problem, let me assure you that’s not the case. It seems that you need the proper combination of a thin-line filter with glass close to the back of the filter, and a lens with a slightly bulging front element (this lens has one, but so do lots of others) to even worry about it. I will add that I’ve put another dozen brand name filters (Heliopan, B&W, etc.) on this lens with absolutely no problem and no sign of glass-to-glass contact. This is a good demonstration about what MIGHT happen. This is a much smaller area than the large smear of carbon I put on the filter.Īnd when we blew the carbon off the lens, there were a couple of scratches that hadn’t been there before. Other than a few specs, it doesn’t come off the filter except where there was glass-to-glass contact. Notice the circular pattern of the carbon,which is fairly clingy. Then I put the filter on the lens, took it back off the lens, and took a picture of the front of the lens. Notice I covered a fairly large area of the filter with it. So I dusted on the back side of the filter with a little carbon black. It’s hard to be certain about that by just looking and feeling. The 9th filter, though, seemed to come in contact with the front element. I went through 8 filters with absolutely no issues. This 24-70 had a front element that was about to be replaced because of some scratches near one edge (which is why I didn’t mind putting filter after filter on it to see if any caused a problem), but the center was absolutely clear. But it can happen and that’s worth knowing. I went through a number of filters before I found one that did. Let me make this point first, though: The vast majority of filters do NOT touch the front element of this lens. ![]() It turns out that the combination of the slightly bulging front element of this lens and a ‘less than best quality’ thin or ultra-thin filter is the culprit. (Ignore the dust, this front element had been taken out for replacement and sat on my desk for an hour before we took the picture.)Īt first I thought maybe there was a problem with the new coating Canon was using, but it seemed a coating issue wouldn’t occur just in the center. The weird thing was it was always in the center of the lens and often circular in pattern like the one below. But since the Canon 24-70 f/2.8 Mk II lens came out we’ve seen a whole lot of them come back with scratched front elements. Here at Lensrentals we see lenses come back with scratched front elements every so often. ![]() Today I’ve got a post about how cheap UV filters may hurt your lens. A long time ago I wrote a blog post called Good Times with Bad Filters about how cheap UV protective filters are different from good ones. ![]()
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