Canon 17-40mm f/4 with 1.4 Teleconverter. Good idea?

[don_lee103]

Hello,
Im a proud owner of Canon 17-40mm.
I currently own 30D and this lens goes really well with the camera as my camera had 1.6 crop but sometimes i wish that i can get more reach out of it. I am thinking of purchasing a teleconverter. Would you recommend this? If so, what brand would you buy?
Let me know and thanks for your help in advance,
Don

[Big Hands]

It will work with a cheap TC, but not the Canon TC as they will not fit. I wouldn't recommend it for image quality issues, but it probably wouldn't be horrible. Your 17-40 f/4 lens would become a 24-56 f/5.6 with a 1.4x TC and a 34-80 f/8 with a 2x TC.

TC's are usually used for telephoto applications. It'll work, but I wouldn't recommend it. Your 30D probably would not autofocus with the 2x on your 17-40.

[PAFC2004]

Well as Big Hands said, it won't fit a canon T/C. But the 17-40 is essentially a wide angle zoom. Perhaps you could purchase another lens that has the reach you need.

[lostdoggy]

It most likely won't fit the Sigma either if the rear of lens protudes.

[don_lee103]

Thanks for the comments. I am indeed thinking about purchasing 24-105mm and sell my 17-40mm to finance it but I am afraid that I will miss the 17-24mm range. Also, i heard that 17-40mm is sharper than 24-105mm lens, is this true?

[genewch]

What about selling the 17-40mm and buying Sigma 12-24mm and a 24-70mm? But for me I'll keep the 17-40mm and make use of the 50 and 85mm and 70-200mm. You've got them already. Enjoy them. Your lenses are already very good.

[don_lee103]

Genewch, my 17-40mm lens is used as a walkaround lens. I love taking landscape photos with it. Only problem is the little extra reach that I need sometimes. I guess Im stuck with it.

[Big WIll]

haha, as soon as i bought the Kenko Pro 300 1.4x i put it on my 70-200. But I then put it on my 17-40mm, focusing was a bit dodgy. But it did work. Looks weird though.

[don_lee103]

Will, Does your TC work well with 70-200?

[Big WIll]

Yes very much so, its superb gives me a 156.8mm-448mm F4 L (thats on a 1.6 crop camera.) Auto Focus is slower but still fairly good, fine for cricket with not much movement but it could still be pretty good for motorsport etc.

[Reptile Bob]

As a general rule, TC's don't work as well with wide angle lenses. A TC does great on the 70-200 however, although there is a noticeable IQ loss when wide open (to be expected). Of course, the big primes take the TC's the best (so I've heard). Hopefully I'll get a 300 2.8 this summer to try it on.

[don_lee103]

Yes very much so, its superb gives me a 156.8mm-448mm F4 L (thats on a 1.6 crop camera.) Auto Focus is slower but still fairly good, fine for cricket with not much movement but it could still be pretty good for motorsport etc.
Wouldnt it be f/5.6 L since its a stop slower isnt it?