4 added 272 characters in body
source | link

From the "Recommended For" tab of the Tamron web page for that lens:

Tamron Di-II lenses are engineered expressly for digital SLR cameras with image sensors commonly referred to as APS-C, measuring approximately 24mm x 16mm.

This means the image circle is sized for the smaller APS-C sensor, and is too small for a full-frame camera like the 6D. This is true of all lenses designed specifically for APS-C, from all manufacturers.

Is there something I can do to fix this?

Unfortunately, no. You will need to replace it with a similar lens designed for a full-frame sensor.

As @Itai pointed out in a comment, even if you managed to find a hack using a teleconverter or other adapter, that lens is not up to the quality and resolution of the sensor. Images taken with that lens on a 6D will never be as good as when using an appropriate lens.

From the "Recommended For" tab of the Tamron web page for that lens:

Tamron Di-II lenses are engineered expressly for digital SLR cameras with image sensors commonly referred to as APS-C, measuring approximately 24mm x 16mm.

This means the image circle is sized for the smaller APS-C sensor, and is too small for a full-frame camera like the 6D. This is true of all lenses designed specifically for APS-C, from all manufacturers.

Is there something I can do to fix this?

Unfortunately, no. You will need to replace it with a similar lens designed for a full-frame sensor.

From the "Recommended For" tab of the Tamron web page for that lens:

Tamron Di-II lenses are engineered expressly for digital SLR cameras with image sensors commonly referred to as APS-C, measuring approximately 24mm x 16mm.

This means the image circle is sized for the smaller APS-C sensor, and is too small for a full-frame camera like the 6D. This is true of all lenses designed specifically for APS-C, from all manufacturers.

Is there something I can do to fix this?

Unfortunately, no. You will need to replace it with a similar lens designed for a full-frame sensor.

As @Itai pointed out in a comment, even if you managed to find a hack using a teleconverter or other adapter, that lens is not up to the quality and resolution of the sensor. Images taken with that lens on a 6D will never be as good as when using an appropriate lens.

3 added 268 characters in body
source | link

That lensFrom the "Recommended For" tab of the Tamron web page for that lens:

Tamron Di-II lenses are engineered expressly for digital SLR cameras with image sensors commonly referred to as APS-C, measuring approximately 24mm x 16mm.

This means the image circle is sized for the smaller APS-C sensorssensor, so the image circleand is too small for a full-frame camera like the 6D.   This is true of all lenses designed specifically for APS-C, from all manufacturers.

Is there something I can do to fix this?

Unfortunately, no. That lens is designed that way, and you You will need to replace it with onea similar lens designed for a full-frame sensor.

That lens is for APS-C sensors, so the image circle is too small for a full-frame camera like the 6D.  

Is there something I can do to fix this?

Unfortunately, no. That lens is designed that way, and you will need to replace it with one designed for a full-frame sensor.

From the "Recommended For" tab of the Tamron web page for that lens:

Tamron Di-II lenses are engineered expressly for digital SLR cameras with image sensors commonly referred to as APS-C, measuring approximately 24mm x 16mm.

This means the image circle is sized for the smaller APS-C sensor, and is too small for a full-frame camera like the 6D. This is true of all lenses designed specifically for APS-C, from all manufacturers.

Is there something I can do to fix this?

Unfortunately, no. You will need to replace it with a similar lens designed for a full-frame sensor.

2 added 131 characters in body
source | link

That lens is for APS-C sensors, so the image circle is too small for a full-frame camera like the 6D. You need a

Is there something I can do to fix this?

Unfortunately, no. That lens is designed that way, and you will need to replace it with one designed for a full-frame sensor. 

That lens is for APS-C sensors, so the image circle is too small for a full-frame camera like the 6D. You need a lens designed for a full-frame sensor.

That lens is for APS-C sensors, so the image circle is too small for a full-frame camera like the 6D.

Is there something I can do to fix this?

Unfortunately, no. That lens is designed that way, and you will need to replace it with one designed for a full-frame sensor. 

1
source | link