2x Teleconverter on the 17-40 ??

cwphotos

My friend just bought the 17-40 and a 2x teleconverter. I tried to explain to him the light loss and quality....but he didnt seem to think it would be an issue. What do you guys think?

ziggy53

cwphotos wrote:

My friend just bought the 17-40 and a 2x teleconverter. I tried to explain to him the light loss and quality....but he didnt seem to think it would be an issue. What do you guys think?

Of course your friend will have issues with that combination. Make a bet about it and make some money.

Teleconverters are not designed to handle the tight angles of light that the rear end of wide angle lenses produce. It is a poor combination and poor choice, but some folks just have to find out for themselves.

Heck, your friend may never even "admit" the problems when they manifest themselves, so you may have to just "let it go" to retain the friendship.

ziggy53

cwphotos

Thats what im thinking. He just got into the DSLR scene and has been scooping up new lenses and such. He said he had done "research" online about it. I said my peace and left it there. He said this would give him some range as opposed to buying a longer lens.... :cry

mercphoto

cwphotos wrote:

My friend just bought the 17-40 and a 2x teleconverter. I tried to explain to him the light loss and quality....but he didnt seem to think it would be an issue. What do you guys think?

The 2X extender will not even mount on a 17-40 lens.

pathfinder

The Canon 2xTC won't even fit on the back of the 17-40. I rather doubt the 1.4 will either, but I haven't tried it. And why would you want to???

Canon has a very explicit list of the lens their TCs will safely fit with -

It says on the Canon USA website " This tele extender can be used with fixed focal length lenses 135mm and longer (except the 135mm f/2.8 Softfocus lens), and the EF 70-200 f/2.8L, 70-200 f/2.8L IS, 70-200 f/4.0L, and 100-400 f/4.5-5.6L IS zoom lenses. Superb optically, it preserves the image quality of the lens it's mounted to and multiplies its focal length 1.4x. Effective aperture is reduced by one f-stop; autofocus is possible on any EOS camera when combined with a lens having an f/4 or faster maximum aperture. The new version II maintains the outstanding optics of the previous version, and adds enhanced weather-resistant construction, and improved anti-reflective surfaces in the barrel."

cwphotos

:uhoh I wonder if he even knows that......Im not sure he has the extender yet, it may be on order..... *picks up phone*

Antonio Correia

Canon 70-200 IS with 1.4 II

pathfinder

We're discussing the 17-40 Antonio

wxwax

pathfinder wrote:

We're discussing the 17-40 Antonio

Hey, a man has to seize every opportunity to show of his work, you know?

Red Bull

Yeah, the 1.4 and 2X extenders will not fit on a 17-40. The rear element moves all the way back to the end of the lens when at 17mm. Plus, the hole is much smaller in diameter compared to a 70-200.

Now you can say "I told you so."

Antonio Correia

wxwax wrote:

Hey, a man has to seize every opportunity to show of his work, you know?

Yes. Dam right !!!
:D:D:D
Sorry Pathfinder. My mistake.

cwphotos

Well I told him and I think he is going to use it for a different lens instead....plus he bought the quantaray version (ugh).