Question about Nikon 18-200mm f/3.5-5.6 G ED-IF AF-S VR DX Nikkor Lens

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Lens is moving

Is it my imagination or is my lens zooming in (or out) all by itself. I take a picture lets say at 50 mm and then all of a sudden I look at my camera and my lens is at 200 mm. Is this normal? Has never happened before and i have had my camera for 2 years. Thanks

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  • writer002 Apr 05, 2009

    Yes, I have the same problem with this lens. When the camera is facing downward in a tripod, the zoom extends and sometimes the camera will not fire.

    Is Nikon fixing this under warranty?


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It is not normal. Something may have loosened up internally. Set the lens to 50mm and then move the camera between pointing lens forward and lens down toward the floor as the camera might rest when you have it on a neck strap and bend over. I am guessing that gravity is pulling the lens out to the 200mm position. In any case, you should have a camera repair man look at it. I do not know what the repair could cost, but you have a superb lens and, if necessary, you may want to spend the money to fix it.

Posted on Nov 28, 2008

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Sigma 17-50 2.8 EX HSM lens is stuck and won't zoom. It takes pictures Ok and sometimes it even focuses in automatic. I can also take pictures without zooming. Can someone help on how to fix.


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Probably the problem come from a loose screw inside zoom cylinder. Normally it happens due to constant use or vibration.
The GMR sensor is very sensitive to magnetized tools an needs an accurate position to function properly.
If you don´t have experiencie with this electronic systems, it is better you to contact Sigma Service in Ronkonkoma, N.Y.

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Canon 35-80 Error 1 clean your lens


The usual method is to use a pencil eraser on the contacts on the lens and the camera. Be careful not to get the bits in the lens or camera

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What is T Mount Telephoto Zoom Lens with 2x Teleconverter


The T-mount is a universal thread developed by Tamron which allows various adapters to couple a lens to a wide variety of camera brands. If a lens is listed as having a T-mount, it means that the lens can be coupled to your camera if you have a T-mount adapter for your camera.

A 2X teleconverter (often called a doubler) enables a lens of a specific to be doubled. For example, the lens referenced above actually is a 650-1300 lens but with the 2X teleconverter the focal length can be doubled to a maximum focal length of 2600.

I have an Opteka 600-1200 telephoto lens which I consider to be a decent lens for its very low price. I also have a doubler which came with my camera kit. That means I can increase the focal length of my lens to 2400 but I cannot imagine any reason to do so. At it's full zoom 1200mm focal length, this lens is very difficult to handle and must be used on a tripod with a remote shutter release.

It is extremely time consuming to focus and must be focused very accurately because it has almost no depth of field. At 1200 mm, the slightest breeze or vibration will cause the picture to go fuzzy from movement.

The lens is also large and does not fit conveniently in a camera bag so it rarely goes with me unless I know for sure that I will need it. It is not particularly good for sports action shots because the action will be over before you are ready to shoot the picture. With very bright light (such as the mid-day sun) and pre-planning and pre-focusing you might be able to get some interesting sports action shots. Say you're at an automobile race and you know a car will be coming into view at a certain spot, you can set up for that spot then trip the shutter when the car pops into view.

All that being said, I think this is a good lens to have in my bag without spending $10,000 plus for a really good lens of this size.

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1 Answer

If you had a compact camera it would say 10x zoom what is the equivilent in a 70mm -300mm tamron


A 35-80 mm lens is 2.3X zoom. Divide 80 by 35 and you'll get the result.

It is usually better to know what the focal length of a lens in "35 mm equivalent" is and judge by that, rather than relying on the "X" power of the lens. For instance, most point and shoot cameras start at about 35 mm and have either a 3X or 4X zoom. This would make it a 35-105 or a 35-140. I've seen some that start at 28 mm, though. A 3X starting at 28 mm is 28-84 and a 4X is 28-112. Neither one is a particularly strong telephoto lens and the 4X is just about the same as the 3X that starts out at 35 mm.

It's also important to realize that tradition dictates that lens focal lengths are usually expressed in terms of "35 mm equivalent," where "35 mm" refers to a 35 mm film camera. This is because of the relation between the sensor size and the actual focal length of the lens and the resultant angle of view of the lens.

I have one point & shoot that is actually a 5.8-24 mm zoom. This is a 4X zoom. The 35 mm equivalent is 28-116 mm. The sensor is 7.2x5.3 mm. (1/1.8") (And I wish I knew someone who could explain how the heck they came up with sensor size terminology!)

I have another point & shoot that is actually a 5.7-17.1 mm zoom. This is a 3X zoom. The 35 mm equivalent is 34-102 mm. "How could a shorter focal length give a longer 35 mm equivalent?" you might ask. It's because the sensor is only about 5x4 mm. (1/2.5")

I have a few Nikon DSLR's and - thankfully - they all have the same size sensor. They all have a "lens factor" of 1.5. This means that you just multiply the actual focal length of the lens to get the 35 mm equivalent and then you can make comparisons accurately from camera-to-camera. Most Canon's, for instance, have a lens factor of 1.6. On a Nikon DSLR, a 28 mm lens is the "35 mm equivalent" of a 42 mm lens. On most Canon DSLR's, the same 28 mm lens is the equivalent of a 45 mm lens.

These example are just to show you how freaking confusing it can all become if you try to make sense of the "X" power of a zoom lens.

Bottom line...

Check the 35 mm equivalent specifications for the lens. This way, you will be leveling the field and comparing apples to apples. More or less.

Jul 10, 2012 | Tamron 75-300mm f/4.0-5.6 LD Lens for...

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I have a Canon Zoom EF-S 18-55mm lens and I'm not sure if it got damaged when I accidentally dipped my camera into the ocean. I haven't turned the camera one, but when i look through the lens...


Sorry, but salt water immersion is effectively just as destructive to your camera and lens as if they had been crushed or burnt. If the body and lens were immersed in seawater then they are complete write-offs as they will be completely beyond economic repair.

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1 Answer

Using a Nikon D200 with a new 18-200mm lens. When


HI I AM SAGHA CAMERA REPAIRER FROM MUMBAI,FIRST READ YOUR LENS SPECIFICATION CAREFULLY IT SAYS 18-200/3.5-5.6 IT SHOULD BE READ AS AT 18 MM IT IS F3.5,THEN AT 200 MM IT WILL BE F5.6 THATS WHY IT MOVES APERTURE FROM 3.5 TO 5.6.IT IS QUITE NORMAL. REPLY ME IF YOU ARE SATISFIED WITH MY EXPLANATION.

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Camera does not take pictures. Lens get stuck when turned on. Flash works sometimes. When turned on nothing happens sometimes Olympus is-200


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What magnification is a 75-300mm lens (10_20_30 times ???)


This lens has a zoom ratio of 4 :1 or 4 times.

Basically 75mm x 2 = 150mm
150mm x 2 = 300mm
I hope that helps,
Ian

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Focal length equivalents


Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";}I believe it is equivalent to a 35 to 210mm lens on a 35mmcamera. If you are considering a Nikon such as the D60, D80, D90, etc.,the standard lens sold with the camera is 18-135mm. This is not the sameas an 18-135mm on a 35mm film camera. The equivalent 35mm film cameralens would be 27-202mm (you multiply by 1.5), about the same as what youhave now. If I were planning to do wildlife photography, I would buy a usedNikkor ED 70-300mm AF lens on E-bay. You should be able to get one for$200 or less (the new price is $550+). This lens is designed for a 35mmfilm camera and is the equivalent of a 105-450mm when used on a Nikon digital cameras. Additionally, it is compadable with the automatic features of the Nikon digital camera bodies. This would give you an excellent portrait lens at 105mm and extra long reachfor wildlife. The fast shutter speed and stabilization circuit on thedigital camera should make it usable in daylight without a tripod. I havethis lens on a Nikon film camera and it is a superior lens. At a 1/1000second or faster shutter speed, I get sharp hand held photos.

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1 Answer

Zoom lens


What camera are you using is the lens making a noise when it stops focusing  call sigma imaging uk 01707 329999

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