Canon and Tamron Lenses

[sbarbian]

I have a Canon 20d and purchased a Tamron 17-50 vc lens a couple months ago. I just found out that if I upgrade to the 7d, I cannot use this lens on my 20d. I had no idea, so how do you know this? My sister-in-law has a 5d and when she put this lens on her camera, it caused a black ring around the picture. Tamron also confirmed this.

[Elmo]

It will work on a 7d but not on a 5d because the 5d is full frame and the 7d is not.

[OsmosisStudios]

Uh, im surprised the 17-50 A) mounted and B) didnt break the 5D's mirror.

[RichardTaylor]

The lens designation specifies what bodies it can be used on.

SP AF17-50mm F/2.8 XR Di II VC

In this case the Di

See this page from Tamron's web site.

http://www.tamron.co.jp/en/lineup/b005/di2.html

[inkista]

Originally Posted by OsmosisStudios

Uh, im surprised the 17-50 A) mounted and B) didnt break the 5D's mirror.

a) All the 3rd party manufacturers don't do the idiot-bumper, and just use the EOS mount, so all their crop body lenses will mount on the full-frames, unlike Canon's EF-S lenses.

b) Not all crop body lenses have elements that go past the mount flange. And typically the mirror doesn't break when it whacks into the back of a lens. At least, not the first few times. Repeated mirror hangs can cause damage, but it's on a spring that seems to absorb most of the shock if it does hit the back of a lens.

People have reported that they can use lenses like the Tokina 11-16 without any issues (other than vignetting below 15mm) on a 5D.

[crockny]

I use my Tamron 18-270 on my new 7D -- no issues ...

[oldwolf]

Originally Posted by Elmo

It will work on a 7d but not on a 5d because the 5d is full frame and the 7d is not.

+1

It will work on the 7D. For some reason Canon made the 7D a crop sensor while keeping the xD naming convention.

[inkista]

Originally Posted by RichardTaylor

The lens designation specifies what bodies it can be used on.

SP AF17-50mm F/2.8 XR Di II VC

In this case the Di...

Slight correction: "Di II" is the Tamron crop-body designation. Di simply means it's got coatings that will help reduce internal reflections with digital, but it can still be used on both full-frame and crops. Similar to the Sigma DG designation.

Crop body-only designations are (from the WIkipedia APS-C page):

• Canon EF-S
• Nikon DX format
• Pentax DA
• Konica Minolta DT
• Sony DT
• Sigma DC
• Tamron Di II
• Tokina DX