Question about Tamron 18-200mm f/3.5-6.3 for Nikon

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Tamron18-200 f/3.5-6.3 I can't adjust the aperture to 3.5 even thought the focal lenght is 18mm, the max aperture is only f/6 i'm using nikon d50 .The focal distance too doesn't show the true reading when I checked on the camera info e.g when I set the lense to 80mm the info on the camera will shows 105mm it seems that d50 can't track the focal lenght what is going on??

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  • blueband Jan 02, 2008

    Hi thanks for the comments

    I had brought back the lens for 1 to 1 exchange and the shop's owner agreed the lens was malfunction.I'm happy with the new lens



1 Answer

Tamron has identified this problem with the Canon. See link:, but I am not sure about your Nikon.

Posted on Dec 31, 2007


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Zooming from 18mm to 55m causes lens to darken (pictures taken are the same). This happens in both M and AF.

This is because the aperture varies with the focal length. Note the "f/3.5-5.6" in the lens designation? This means that the maximum aperture is f/3.5 at 18mm and f/5.6 at 55mm. If you set the aperture first and then zoom, the aperture could change by as much as one-and-a-third stops.
To prevent this, zoom first and then meter the exposure.

Aug 13, 2013 | Nikon Nikkor 18-55mm f/3.5-5.6G ED AF-S DX...

1 Answer

Zoom and aperture problem

What lens do you have on the camera? Many zoom lenses have a variable maximum aperture. This means that the maximum aperture varies depending on the focal length. If you set the lens to its maximum aperture and then zoom, the aperture may change.

Feb 11, 2013 | Nikon D3100 Digital Camera

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My kit lenses, Canon 18-55mm stopped going till F/3.5, even using it in 18mm. Now the mininum it goes is F/5. Any solution for that?

If you are focusing very close that may be a consideration. But if it does not change at any focal length, and focal distance then it will need to be repaired. Or, try for excellent quality used lenses. That lens can be replaced to the same or less than a repair.

Nov 29, 2012 | Cameras

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Can i increase the focal length of the 75-240 lens if i add a mount or something like that? Please let me what you suggest.

Hi. Yes, you can increase your focal lenght with photo converter x1.4 or photo converter x2 so it would be 105-336mm with x1.4 and 150-480mm with x2. But consider that mounting such converters you increase the minimal aperture. Thus you will have to use higher ISO or longer shutter speed.

Apr 28, 2011 | Nikon 75-240 F4.5-5.6D AF ZOOM-NIKKOR Lens

1 Answer

How do you take a pic with the Nikon d60 where the background is blurred?

You're trying for what's called a narrow depth of field. DoF is controlled by three factors: distance from camera to subject, lens focal length, and lens aperture. The closer the camera is to the subject, the narrower the DoF. The longer the lens focal length, the narrower the DoF. The larger the lens aperture, the narrower the DoF.

Get as close to the subject as practical, and use as long a focal length as practical. I realize these two aims conflict with each other. For portraits, you want a focal length in the 50-90mm range and move in to fill the frame.

You want to shoot with as wide an aperture as you can. Unfortunately most lenses are not at their sharpest wide open. Also, the 18-55mm lens doesn't open up all that wide, f/3.5 at 18mm and f/5.6 at 55mm. To get the widest aperture, you can shoot in the P or A modes. If you don't want to leave the point&shoot modes, try using the Portrait mode.

Since you're not paying for film, I suggest you experiment with the different settings and shooting setups, moving closer and farther from the subject, using different focal lengths, and using different apertures, and see what results you get.

Nov 22, 2010 | Nikon D60 Digital Camera with 18-55mm lens

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On my d90, under M (manual mode or aperture priority), the aperture on the readout goes beyond the actual aperture range; i.e. f3.5 - 5.6; readings will show aperture range of 5 - 29 when I scroll with the...

There is NOT a problem. The f3.5-5.6 indicates the maximum aperture in the zoom range. At 18mm the maximum aperture is f3.5, at 105mm it's f5.6. The minimum aperture ranges from f22 to f38.

So, at 18mm, the aperture can range from f3.5 to f22. At 105mm, the aperture can range from f5.6 to f38. At intermediate focal lengths the aperture range is somewhere between the two extremes.

Nov 16, 2010 | Nikon D90 Digital Camera with 18-105mm...

1 Answer

Can't get F3.5 aperture on the 18-135mm kit lense on d80

You may be shooting auto and there is too much light. If you want to be sure you are shooting with 18mm @ f3.5 then shoot with aperture priority (the shutter speed will adjust automatically). Ususally at a wide focal length you would want a small aperature (smaller f-stop) so this should not really be a problem.

Feb 14, 2009 | Nikon D80 Digital Camera with 18-135mm...

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Aperture not going below 6

There is no problem. The lens is f/3.5-6.3. That means that at 200mm the maximum aperture is f/6.3. At long focal lengths you will not be able to open up beyond f/6 or so. At the short end, at 18mm the maximum aperture is f/3.5.

Aug 16, 2008 | Tamron 18-200mm f/3.5-6.3 for Nikon

1 Answer

Nokon d40 Appiture

The aperture varies according to focal length... at 18mm the lens will go as wide as f3.5, but at 55mm the lens only widens to f5.6

May 21, 2008 | Nikon D40x Digital Camera

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