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Well I got a used tamron 28-75mm f/2.8 lens and I was told It has BIM so it can focus on my d3100 and well.. idk how to turn on the af? just a simple question

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Nice lens, there should be a switch on the lens barrel fitted close to the camera body when the lens is mounted. It's between the 50 and 60mm focal length markings I'm going to add a picture but not sure how well it will show up. Also the newer Nikon's have some tricky auto focus motor that's fussy to what lens it's capable on auto focusing here is the picture. Happy New yearWell I got a used - tri3mast_50.jpg

Posted on Dec 31, 2010

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1 Answer

Does the Nikon AF 70-300mm f4-5.6G Lens work with the Nikon D3100?


Yes, as long sa the lens can fit the bayonet. But it can't focus, because there are no AF motors in Nikon D3100 and AF 70-300mm f / 4-5.6 - G. And Nikon lens with AF is without AF motor. Lens marked with AF-S have focusing motor

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Can Tamron 2 X converter C-AF 1 BBAR MC-7 mounted with Canon 100-400mm? Tks


As you can read in the Dpreview link the Tamron converter can work perfectly with the Canon cameras. Question is, will AF still work, because you have to multiply the aperture twice. So if your lens has f/1:5,6 that will become f/1:8. Most camera's can't auto focus anymore on F 8

link to Dpreview Tamron 2X converter

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Which is better to get - manual focus or AF extention tubes for Nikon D3100


AF tubes will let you focus manually, so you don't lose anything by getting AF tubes (except for additional money, perhaps). However, most close-up work requires manual focus anyway due it the very limited depth of field, so you won't gain much by getting AF tubes.

Personally, I've never missed the AF capability when using my manual tubes with my Nikons.

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1 Answer

My focus will not work on my tamron aspherical 18-200mm


Hi Missy - certain Nikon bodies lack the built in auto focus motor as a way to hold costs down and make them affordable. The problem is that any lens purchased for these bodies will need to include the motor - and adds the expense to the lens. Instead of paying for the motor once in the body, the owner will need to buy it in every lens purchased for that body. As of this writing, the Nikon bodies that lack an AF motor are: D5100, D5000, D3100, D3000, D60, D40X, D40.

When selecting a lens for one of the cameras listed above, you must choose the model for a Nikon that needs the AF motor built into the lens. Tamron sells lenses for these camera bodies and states they have "BIM" or "built in AF motor" and similar. In any case, regardless of lens manufacturer, you must purchases lenses that have the AF motor built into the lens, otherwise it will not be able to auto focus. Here is a site with a list of all lenses known to to have the AF motor built into the lens.

I hope this helps & good luck!

Apr 29, 2012 | Nikon Cameras

1 Answer

My D3100 will not autofocus or take pictures even if the lens is set to Auto Focus. If the lens is set to Manual, all works well. How do I get auto focus to work again


Go to your settings when your in shooting-mode (Press the 'i' button on the bottom left).
There, change your focus mode from MF to AF-S or AF-C or AF-A.
Should work.

Feb 05, 2011 | Nikon D3100 Digital Camera

1 Answer

I got this lens (Nikon AF NIKKOR 50mm f/1.4D) for my D3100 and it doesn't autofocus. I don't knowhow to intervene since there's no switch on the lens itself (because I understand it is small and it doesn't...


The D3100 can't autofocus with this lens. The D3100 does not have a focus motor, depending on the lens to have one. The AF-Nikkor 50mm doesn't have a focus motor, depending on the camera to have one.

To autofocus, you need lenses designated AF-S.

Dec 24, 2010 | Nikon Normal AF Nikkor 50mm f/1.4D...

1 Answer

I have a Nikon d3000 and a Tamron AF 55-200mm lens. I cant get the lens to autofocus with my nikon


The Nikon D3000 does not have a focusing motor built-in, relying on the lens to have a motor. The Tamron AF 55-200mm does not have the necessary motor; it only auto-focuses with Nikon cameras that have the motor in the camera body.

For Nikon lenses, you need lenses designated AF-S. For Tamron, you need lenses designated USD and/or BIM.

That probably wasn't the answer you wanted to see, but there it is.

Aug 08, 2010 | Tamron 55-200mm f/4-5.6 Zoom Lens for...

1 Answer

Tamron 28-200 AF Aspherical LD. Does it have manual focus? If yes, where?


There should be a switch just in front of the back of the lens marked "AF" and "M". Set it to M for manual focus, AF for autofocus.

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Tamron 28-300mm Model 185D Auto Zoom on Nikon d40


Autofocus function on the D40 only supports lenses with the
AF-S feature, which have an autofocus motor built into the lens,
instead of using an autofocus motor drive built into the camera.

The Tamron lens you have, does not have a built in motor and
the autofocus function relies on the motor drive in the camera.

It will not work with the D40 or D60, but it will work with other
Nikon digital SLRs, such as the D80. Need to get an AF-S
type lens or upgrade to different Nikon digital SLR. Unless
you do this, you will have to manually focus the Tamron lens.

All of the Nikon DX (for digital) series lenses are also AF-S
type, so they will work with the D40, which is designed as
an entry level digital SLR, therefore it is intended primarily
for use with DX lenses, which are typically sold in a kit with
the D40. Most common one is Nikkor 18-55mm DX AF-S.

Other Nikon AF-S lenses made for film cameras (FX type)
will also work with the D40, but these tend to be expensive
professional models. DX series lenses tend to be more
affordable. You might consider the 18-200mm DX AF-S
as an alternative to the Tamron, but these are not cheap.

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