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Remove the front element of a Sigma 150-600mm C lens

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

randy320sgi
  • 121 Answers

SOURCE: 70-300 DL Sigma Macro Zoom lens element loosened, and then reset

amaizin, That's not really normal, because you might only normally hear a tiny noise if you shake a lens not mounted on the camera, but not loose glass sound, everything is fixed and solidly set for alignment when focusing if any element is loose it could never be able to get a clear focus and the element would be so scratched there would be all kinds of distortions even if it went "back into" place. You'll hear loose glass after you drop a lens on to the sidewalk or hard surface and an element is dislodged. Inspect the lens body for an impact mark a lightened portion in a ring shape where the metal or plastic has been stressed or the telltale signs of an abrasion from something like a hard rough surface such as concrete (a little group of pin **** on a corner). The lens should be inspected by a reputable shop to determine if it needs to be repaired or replaced. I take it that you were selling it to upgrade to another lens or other equipment. randy320sgi

Posted on Jan 30, 2009

  • 11967 Answers

SOURCE: I have fungus on the inside of the front element

I hope you're not thinking about doing the job yourself.

Posted on Dec 08, 2009

  • 117 Answers

SOURCE: Sigma 600mm mirror lens internal part discounnected

There is a ring you must remove then you will have to soften the silocon we use aceton but you must be very carefull DONOT lever out the elemet just turn over the lens and bang it on the table a few times and the front element will fallout with luck

Posted on Jan 01, 2010

  • 117 Answers

SOURCE: diagram of parts in sigma 28-80mm zoom lens

Hi The front lens just screws in and no locking ring

Posted on Jan 11, 2010

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Hi, I strongly doubt you would be able to fix it yourself. My suggestion would be to contact Gus Lazzari he seems to have access to a lot of camera and lens parts no matter how old they are.

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Hi is it the 300mm or 120-300 you have a problem with if its the 300 what one is it ie 300mm 2.8 or 300mm 2.8 EX HSM or 300mm f2.8 EX DG HSM which element is it near the mount end or the front can you send a pic of the part you need

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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

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2 Answers

I have a sigma 18-35. It has not been used in a while and mold has formed on the inside of the lens. How can I open it up to clean?


Hi
to remove the front lens you will see a ring that you can peel off and you will see
4 screws take them off and the front lens will come off

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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 ... ::--))

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there is a locking ring you have to remove and then the front optic may fall out if it sticks you may need to heat up the barrel that might work

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Sigma 600mm mirror lens internal part discounnected


There is a ring you must remove then you will have to soften the silocon we use aceton but you must be very carefull DONOT lever out the elemet just turn over the lens and bang it on the table a few times and the front element will fallout with luck

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Questions on disassembly for sigma 400mm apo af


Hi
Sigma will not repair this lens as the fungs may be in the lens on the barrels and if thay could clean
or replace optics the fungs may come back so thay cannot give a guarantee I know someone who
cleans lenses let me know if you want to contack him

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1 Answer

Diagram of parts in sigma 28-80mm zoom lens


Hi The front lens just screws in and no locking ring

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