Question about Sigma 18200mm f3563 DC OS for Canon

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How to dismantle the lens front element. My reason is to clean the dust inside. Thanks.

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  • kakima Oct 07, 2010

    Before you start taking it apart, consider this: Do you have a lens collimator and other equipment to make sure you're getting everything aligned when you put it back together? If you don't, the result will be worse than your current dust problem.

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I strongly recommend you do not try this unless you are trained in camera/lens repairs and have the correct tools and solutions. Too many things that can go wrong, not the least of which is introducing more dust into the lens than you manage to clean off. Also, most lenses have a lesser or greater amount of sealant which may potentially be ruined. Lens elements are carefully aligned, and any misalignment on re-assembly will negatively affect focus in any lens, more so in a zoom. If the dust is affecting your photos, I suggest you have a local Sigma authorized camera repair shop clean it. And, most will have a limited warranty of 30 or 90 days. I speak from experience ... ::--))

Posted on Oct 16, 2010

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1 Answer

Real hard to see & not focused 5 feet in front of whatever trying to look at.


Try this, take both lens out. All you have to do is just unscrew the lens. Use a very good optic lens clean with anti-static charging elements in the clearner. Only remove lens in a room semi free of dust, mites--little monster that live in the carpet, flaky skin, pet hair, etc. If it is dust inside of the NV devise, use a computer air spray to clean the inside. Assembly in reverse order. stewbison

Aug 06, 2011 | Night Owl Optics Explorer NOCX3 Monocular

1 Answer

I have quite a lot of fungus inside my sigma mirror ultra lens, the front lenses were easy to get out and polish but I am concerned about dismantling the smaller rear lenses. Are there any complications to...


Holy Smokes, well if I were you right now I'd put it back together and send it to Sigma for repair cause you dismantle a lens like that there is no way you are going to align those lens elements without the proper equipment.

Using anything more then lens cleaner for camera optics will in fact remove the coating from the lens.

What you have isn't like the lenses from a "View" camera where it was possible to remove one lens group and replace with another but, those lenses were made and used 70 years ago.

Lens technology has changed a bit since then.

I had a manual focus Nikon F2.8 lens one time that had a coating separation on the front element that caused some wicked flare. I took eye glass cleaner and Windex to it to remove the rest of the coating so I could continue the shoot. I then sent the lens to Nikon for repair.

Best of luck with that one

Apr 27, 2011 | Cameras

1 Answer

Leans moror cleaning


Your camera doesn't have a mirror it uses an electronic viewfinder/LCD, also the lens is fixed so without complete dismantling of the camera the sensor can not be cleaned as with a "conventional" DSLR. I'm going to suggest if you feel the sensor requires cleaning I'd look at the front lens element and clean this with a lens cloth, the LCD screen can be cleaned with a lens cloth as well use a cloth not tissue.

Jan 14, 2011 | Fuji FinePix S7000 Digital Camera

1 Answer

Shadow on picture and CRT, lens is clean


No ! The antishake unit makes for very difficult dismantling of this model sorry

Jun 02, 2010 | Fuji Finepix F50FD Digital Camera

1 Answer

My panasonic dmc-fz30 has dust inside the lens, is this possibly a job i could fix myself


How can you tell it's dust inside the lens? Does it show up in the pictures? And no, you can't take the lens apart to clean it because you don't have the precision equipment necessary to remount the lens elements within the close tolerances necessary.

Mar 16, 2010 | Cameras

1 Answer

Clean dust inside the lenz


Don't. Unless there are some really big specks of dirt inside the lens then they will have no effect at all on picture taking. To prevent the problem getting worse always store your lens with it's front and rear caps on and inside a lens bag. Also make sure that your camera bag is clean and isn't shedding fibres from the inner linings.

Dismantling your lens to clean it is really a job best left to a professional who will then additionally check and clean/lubricate the moving parts inside the lens.

Jul 03, 2009 | Tamron 28-300mm f/3.5-6.3 DI XR for Canon

1 Answer

Water inside the lens (Canon EF-S 17-85mm F4.5-f5.6 lens)


if it is only fogged you can blow hot air on the lens while fully zoomed in and after the water has evaporated, zoom out to compress the moist air out. do this several times.

May 23, 2009 | Canon Cameras

1 Answer

Water spot inside the lens on my Lumix camera


DON'T EVEN TRY TO TAKE THE LENS OFF!!!

To take the lens off, the camera has to be dismantled, and unless you are an experienced technician, there is a 95% chance that the camera will have more problems than what it started with.

Have you taken any pictures with the water spot inside the lens? If it is visible in pictures, then you have several options:

1. Ignore it.

2. Leave it there and use an image editor to clone out the spot in the picture. (Recommended).

3. Take the camera to a repair shop, or mail it to Panasonic's service center. This is the expensive option, to remove the water spot, the price most likely will be well over $100.

4. Buy another camera. The FZ7 is rated to about 50,000 shots, so if you are approaching this number they it may well be worth it to just get another camera.
-------------------------------------------------------------------

Unless the spot is seriously affecting your pictures, then leave it there. By having the camera opened there is a high chance that other problems will be introduced, such as: fingerprints,dust or hairs inside the lens or misaligned lens elements.

My FZ7's lens is full of dust, yet this is not usually visible in pictures, when it is, I can usually remove it on the computer.

I would recommend taking the camera to a service center as a last resort.

Jul 10, 2008 | Panasonic Lumix DMC-FZ7 Digital Camera

1 Answer

Remove lens


GOT IT!!! I had the same problem. Took all of the screws out of the thing and disconnected the PCB. That allowed me to take the Lenses unit out. Once I did that, dismantle the Phillips screws from the rear of the lens and pull the lens apart. I found a Little White speck of dust on the Sensor. Took that off, put it all back together and it’s like New!! Chuffed. Hope you have as much Luck as I Did. :D

Mar 30, 2008 | Panasonic Lumix DMC-FX3 Digital Camera

1 Answer

Spot on pictures


Well short answer to your dismanlter question is do not. Contact Canon for a repair cost - this is fine lab work not for the kitchen table.

Aug 19, 2007 | Canon PowerShot A520 Digital Camera

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