Question about Sigma APO 50-500mm F4-6.3 EX DG/HSM Lens

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Bigma 50/500 as i rotate the the zoom ring it gets grit like and is hard to turn and it is removing paint from the inner tube feels like a rock is under the ring any thing i can do to fix this with out taking it apart like some shim stock to see if i can get the rock

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Hey Bob G,
I would try blowing compressed air into the lens to try and dislodge whatever is stuck in the lens barrel. If this doesn't work I would advise you to not take the lens apart. Camera lenses require precise mechanical alignment that can only be achieved with the right tools and the education necessary for achieving it. It would probably be easy to take it apart, but very hard to put it back together. You could try a shim, but you run the risk of damaging the lens further. I hope this helps!

Sincerely,
Allan
Go Ahead. Use Us.

Posted on Jun 25, 2008

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Hi Bob I have the same problem I think. Is there play between the back and front of your housing. I think Sigma should have put more support on the front end of that lens. I drilled a hole thru the mount and tapped the hole to but a bolt in order to take tension off the focus ring and it worked. I know this didn't solve the real problem but the lens is working fine. I bought the lens used and didn't get the original receipt therefore coudn't get the warranty so you do what you have to do. If you need a picture of the modification send me your e-mail.

Rick

Posted on Sep 13, 2009

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2 Answers

Limited zoom


Hi,

You mean that the lens are getting stuck right??
If so then follow the below steps for fixing your lens problem:

Fix #1: Remove the batteries from the camera, wait a few minutes. Put a fresh set of batteries back in and turn the camera on.
Fix #2: Remove the batteries, then remove the memory card. Then install the new batteries, when you turn it on it should come back to life. Error E30 means you don't have a memory card installed, so turn it off, slip in the memory card and turn it on one last time.

Fix #3: Insert the cameras AV cable, and turn the camera on in picture review mode. Have no idea why this would work, except that quite a few people have reported some success with it.

Fix #4: Place the camera flat on its back on the kitchen table, pointed at the ceiling. Press and hold the shutter button down, and at the same time press the power-on button. The idea is that the camera will try to autofocus while the lens is extending, hopefully seating the lens barrel guide pins in their slots.

Fix #5: Blow compressed air in the gaps around the lens barrels with the idea of blowing out any sand or grit that may be in there jamming the lens. Other variations include blowing with a hair dryer in “no heat” setting, or sucking the gaps with a vacuum cleaner.

Now we're entering into the realm of potentially damaging your camera in conducting the fix. Take care when conducting the following two fixes.
Fix #6: Repeatedly tap the padded/rubber usb cover on a hard surface with the intent of dislodging any particles that may be jamming the lens. A lot of people have reported success with this method. HOWEVER, there is some potential for damaging or dislodging internal components with this method, such as unseating ribbon cables.

Fix #7: Try forcing the lens. Many people have also reported success with this method. HOWEVER, there's obviously some potential for damaging your camera by using this method. Variations include pulling, pushing, rotating or twisting on the lens barrel while hitting the power button. Another variation includes looking for uneven gaps around the lens barrel, and then pushing on the lens barrel side that has the largest gap. While doing these, listen for a click that indicates that the lens barrel guide pins have reseated in their guide slots. If you hear this click, immediately stop and try the camera. The following photo illustrates unseated guide pins that would cause a lens error.

Goodluck...

Feb 14, 2008 | Olympus EZ 14-45mm f/3.5-5.6 for SLR

1 Answer

I have a nikon 70-200mm f/2.8 VR lens. I've had it for three years. It's tack sharp and fast to focus. It's everything as advertised. I shoot mostly sports and it's my primary go to...


This sounds like the zoom ring has had a knock somehow and it is no longer free to rotate.
I think it is too early to be wearing out.
Either way I suggest you have it inspected by a camera repair shop as it will only become worse over time.

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Hi I bought a pro-spec 70-210 lens for my Sony Alpha. When you go to zoom out it doesn't twist. You can pull it straight out...Is this how it should work? The rest of my lenses all twist out


Yes. It's a push pull zoom action.

One touch zooms as used on 35mm film SLRs used to have the same mechanism, the zoom ring twisted as well to achieve focus but now that most lenses are autofocus that's unnecessary. So you have a lens which just retains the push-pull, a far more natural action in my opinion and usually faster than a rotating zoom. Once you get used to it I think that you'll prefer it.

By contrast, most modern zooms have what was considered in 35mm terms to be an old-fashioned twin touch zoom: one ring was turned to zoom the lens and another was turned to focus it. This sometimes meant that after zooming you had to refocus; your push pull zoom will likely have a more technically demanding constant focus zoom action, there will be an additional manual focus control as well, but it's very much a minor secondary control used only when your AF has broken or is switched off.

I hope that my reply has been of use to you, please return the favour by rating my answer.

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Can not remove adaptor ring from leica dicomar optical zoom.


I ran into this several years ago and the solution that I came up with (that worked) was to go to the local autoparts store and buy a filter wrench. Get one that has the adjustable rubber belt, which allows you to go to any size. Wrap it around the adaptor ring and gently turn- should come off. These wrenches are cheap too, under $10 and they can be used on other items as well- jars of food and anything else that you need to twist off. Hope this helps!

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48 Answers

Haze behind front lens of Canon FD 50mm Macro lens


If the built in lens hood has a rubber grip ring at its base, it is possible that the ring conceals access holes for grub screws that lock the ID ring in place. The ID ring is obviously the hood retainer as well as filter mount. Even if no rubber ring, the disassembly instructions may have you removing the whole front section so that hood goes rearwards - revealing grub screws. If the ID ring seems reluctant to move do not force it, Look for one or more lock screws.

Jan 11, 2009 | Camera Lenses

1 Answer

How to achieve full zoom with a Nikon 55-200mmf/4-5.6G ED lens?!


1) What camera body are you using?

2) I do not understand your assertion that it automatically zoomed in. Zooming is a manual function. The automatic functions of your lens pertain only to focusing on of the subject so that your picture is sharp and ensuring that the correct amount of light is admitted so that you have a correct exposure.

3) Are you sure you were turning the zoom ring and not the f-stop ring? The zoom ring is labeled 200 on one end of the scale and 55 on the other. It is also the widest ring on the lens barrel. When you rotate it, the physical length of the lens will lengthen as you rotate it clockwise (viewed from behind the camera) and shorten as you rotate it counter-clockwise.

4) For reference, at 200mm the angle of view on your lens should be 10 degrees and at 55mm about 40 degrees.

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1 Answer

My question is about a Quantaray 75mm-300mm


Slide a piece of paper partway under the ring (make sure you leave enough hanging out so you can remove it later) and see if that tightens the action some.

Another low-tech approach is to push the ring to expose the inner barrel, then attack one or more pieces of Scotch tape or masking tape.

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3 Answers

I have dust under outer lens on my 75-300mm f/4 -5.6 III USM


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.

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3 Answers

Dropped the lens, nothing broke but focus ring came undone


This will need technical service eventually. Try temporary solution with Sellotape or similar

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