Question about Canon 75-300mm f/4-5.6 III USM EF Lens
I keep having a dust spot on my pictures so afters lots of cleaning and trying it over and over, I found the dust but it is under the lens, I think I can just unscrew the 3 little screws and use my blower to remove it then replace the screws, but not sure what would happen do things need to be aligned? with it still make nice photo's any ideas kinda of nervous to just started taking things apart
Front element? You can remove this without alignment worries. The lens zoom mechanism tends to **** in the dust.
Have a look at the front element outer ring. There are 3 black screws. Remove these using jewellers screwdriver (y'know, a very small posi-drive one!). Remove this plastic outer ring. Now you can see three small silver screws, that are about the same size - when you try to unscrew them, they just rotate...
This is as they are not screws, but as mentioned elsewhere - they are plugs (if you notice, they are slightly under the casing. Get a small flat bladed screwdriver, and gently prise them out. Now you can just drop the front element into something sensible - like a microfibre cloth (give it a clean whilst you're there.
Get a rocket blower (NOT canned air), and blow away the dust, and you can use the microfibre cloth (or similar) on the small inner front element.
Then replace the outer front element - you will see where it drops into place - there are plastic guide tabs. Push back the silver 'screw' plugs.
Then screw back on the plastic outer ring and you're done - takes 20 minutes at the most.
Posted on Jul 30, 2009
Well I just found that the y are not screws but plugs, and if you use a small screw driver you can pull them out and th elens drops out . Now all I need is some pne to tell me how to get the outer case off the inner.
Posted on Jul 29, 2008
If you wish to attempt that, there are other steps involved before removing the 3 screws. The circuit connection is attached to the mount ring, held by 2 screws in the channel of the mount. You may need to free the center plastic on the mount to remove the ring itself. ( I am going from memory, I don't have a lens on hand to look at )
Posted on Jul 08, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Aug 16, 2011 | Canon 75-300mm f/4-5.6 III USM EF Lens
Jan 25, 2011 | Canon 75-300mm f/4-5.6 III USM EF Lens
Jan 06, 2011 | Canon EF-S 17-85MM F/4-5.6 IS USM Lens
Jan 17, 2010 | Canon 75-300mm f/4-5.6 III USM EF Lens
Dec 17, 2009 | Canon 75-300mm f/4-5.6 III USM EF Lens
Sep 27, 2009 | Canon 75-300mm f/4-5.6 III USM EF Lens
Aug 03, 2009 | Canon 75-300mm f/4-5.6 III USM EF Lens
Apr 29, 2009 | Canon Zoom Telephoto EF 75-300mm f/4.0-5.6...
878 people viewed this question
Usually answered in minutes!