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From: Shane on 3 Feb 2010 20:25
I purchased a Tamron-F 2x c-af1 BBAR MC7 teleconvertor for my Canon XSI. I
have two Canon lenses, an EFS 55-250 and an EFS 18-55. The teleconvertor
fits fine on the camera, but neither lens will fit down into the
teleconverter. Any help on this is greatly appreciated.


Thanks,
Shane.

From: Paul Furman on 3 Feb 2010 22:23
On 2/3/2010 5:25 PM, Shane wrote:
> I purchased a Tamron-F 2x c-af1 BBAR MC7 teleconvertor for my Canon XSI.
> I have two Canon lenses, an EFS 55-250 and an EFS 18-55. The
> teleconvertor fits fine on the camera, but neither lens will fit down
> into the teleconverter. Any help on this is greatly appreciated.

Nikon TCs won't mount many lenses either. The lens needs to have a deep
recess to fit, usually longer lenses... Teleconverters are generally not
that useful for slow consumer zooms like that anyways, so even if it
fit, the results probably wouldn't be worth much. See if you can return it.

PS I don't know Canon gear but this sounds like the same issue.
From: Bruce on 4 Feb 2010 04:33
On Wed, 3 Feb 2010 18:25:05 -0700, "Shane" <atldal3(a)bresnan.net>
wrote:

>I purchased a Tamron-F 2x c-af1 BBAR MC7 teleconvertor for my Canon XSI. I
>have two Canon lenses, an EFS 55-250 and an EFS 18-55. The teleconvertor
>fits fine on the camera, but neither lens will fit down into the
>teleconverter. Any help on this is greatly appreciated.


This is a common problem. Teleconverters are not designed to work
with those lenses. Neither lens would produce acceptable results with
a teleconverter in any case.

If you can return the teleconverter for refund or exchange, do it now.
If that isn't possible, advertise it on eBay or Craigslist.

From: Mr.T on 4 Feb 2010 19:23
On Wed, 3 Feb 2010 18:25:05 -0700, Shane wrote:

> I have two Canon lenses, an EFS 55-250 and an EFS 18-55.

EF-S lenses won't fit in EF teleconverter, and even if they
would, AF won't work with slow lenses. So, you're doomed.
From: R. Mark Clayton on 4 Feb 2010 19:23

"Bruce" <docnews2011(a)gmail.com> wrote in message
news:2r4lm5hu94qlg60fufif9o00s5ebjar0n9(a)4ax.com...
> On Wed, 3 Feb 2010 18:25:05 -0700, "Shane" <atldal3(a)bresnan.net>
> wrote:
>
>>I purchased a Tamron-F 2x c-af1 BBAR MC7 teleconvertor for my Canon XSI.
>>I
>>have two Canon lenses, an EFS 55-250 and an EFS 18-55. The teleconvertor
>>fits fine on the camera, but neither lens will fit down into the
>>teleconverter. Any help on this is greatly appreciated.
>
>
> This is a common problem. Teleconverters are not designed to work
> with those lenses. Neither lens would produce acceptable results with
> a teleconverter in any case.

The former might at the long end - if it would go on.

As for the latter - that's silly.

>
> If you can return the teleconverter for refund or exchange, do it now.
> If that isn't possible, advertise it on eBay or Craigslist.
>


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