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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 04 Jun 2010 (Friday) 16:01
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Rotated Front Element on Canon 28-300 lens

 
bmitch
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Jun 04, 2010 16:01 |  #1

OK, so I have what I think is a unique problem.

The front front ring that the lens hood mounts to on my Canon 28-300 lens has rotated and now when I attach the lens hood at certain focal lengths the hood shows up in the pictures.

Does anybody know if it is a simple procedure to realign that ring?

Thanks,
Mitch


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katodog
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Jun 04, 2010 16:08 |  #2

I'm trying to remember if the front element was individual on the lens, and the little screws in the ring are all that's holding it. I think they are, and if so you can loosen them a little, turn the ring to where it belongs, and re-tighten the screws.


In other words, the silver band with the "Canon Zoom Lens EF....", there's three or four screws in it. Loosen them, turn the whole front element, ring and all, to where they need to be, then tighten the screws. It's possible the screws are already loose, and that's why the front element moved. Wish I could help further, but I sold mine months ago, and can't recall how many screws there are.

Typically the front element in in its own cell, and you can take it off and put it on with no issues. Sometimes they need to be in the correct position for the best IQ, but I doubt it with that lens. Just loosen the screws a bit and see if the whole front cell moves, if it does you're all set.


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philwillmedia
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Jun 04, 2010 16:35 |  #3

You've probably already checked, but are you sure that the hood is mounted properly and locked in place?


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bmitch
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Jun 04, 2010 19:53 |  #4

Thanks katodog, we're thinking of giving that a shot. Just one of those things you have to just hold your breath and do it! LOL

Phil, we checked that, but that is a good question.


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katodog
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Jun 04, 2010 20:01 |  #5

If I remember correctly, the hood only goes on two ways, right side up and upside down. I don't think you can put it on sideways. If that makes any sense. I think the only way it could be on "wrong" is if the front element did turn, which is probably because those screws are loose, or were loose.

Try it and see, the worse that can happen is the element comes off, which is no big deal because that whole cell is just screwed on in the first place. And you don't have worry about it being "right", because the front element of a camera lens is just a basic optic, there's no right or wrong way for it to go on. Besides, all you're going to do is turn it a little bit.


Here's an image of the one I had, maybe it'll help figure out which side is "up" if you turn it...


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criza
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Apr 13, 2011 08:20 as a reply to  @ katodog's post |  #6

Hey!
I've got a problem with this lens. I removed the two screws at the end of the front part of this lens (where you fix the lens after you set the focus), unfortunately I can't screw them back. As it seems the little balls in the ball-bearing have moved and now you can't turn the the holes of the outside part to the point where the holes on the back, down part of the lens are, so you could turn the two screws back in place. I know this is not good English and my problem is a very stupid one! Still, is it a big thing to take the lens apart, in two pieces, but the ball-bearing balls back to their place and then rotate the lens back so the outer holes and inner holes match, so you can put back the screws? If anyone could point this out, I would appreciate it very much! Thank you.
Chris




  
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Rotated Front Element on Canon 28-300 lens
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