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-   -   2x teleconvertor (https://forums.steves-digicams.com/canon-eos-dslr/185140-2x-teleconvertor.html)

TD Cole Mar 7, 2011 10:57 PM

2x teleconvertor
 
Hi all
I am thinking of adding a 2x extender to my 55-250mm IS, on my T2I. Are there any downfalls as opposed to buying a 500mm of which I can't afford?
What should I watch out for when buying an extender for this lens?
I would LIKE to keep the cost at under a hundred dollars us until I decide to go further into the better lenses.
Thanks for any help offered.

PhrozeN_FisH Mar 8, 2011 4:06 PM

I'm not sure if any (or which) of the TC's will fit the EF-S lenses. I am pretty sure that you would lose auto focus though. I have a Bower 2X MC4 TC which I tried on my Canon 70-300 IS USM that searched a lot and lost auto focus at about 130mm. I have used it with My 70-200 f4L without any auto focus problems.

If you can find one that will fit I would go with a 1.4X as it will lose 1 stop of light where the 2X will cost you 2 stops.

Hope this helps.

TD Cole Mar 9, 2011 11:03 AM

Thanks Phrozen, I'm gonna have to look into this a bit more for sure :)

Sniper X Mar 10, 2011 3:36 PM

I have a 2X which did allow autofocus albeit slower than usual. I'll have to try in on the 30D when I get home tonight. I'll try it on a 100~300 that I have since the long end is the same as yours.

TD Cole Mar 10, 2011 4:35 PM

Thanks guys I was looking at this one here sorry for the outside link.
What do you think?

http://cgi.ebay.com/2X-TELE-CONVERTE...item35b06cf272

Sniper X Mar 10, 2011 5:06 PM

Quote:

Originally Posted by wagaboo (Post 1207842)
Thanks guys I was looking at this one here sorry for the outside link.
What do you think?

http://cgi.ebay.com/2X-TELE-CONVERTE...item35b06cf272

Mine is almost exactly like that but branded by Tamron.

Here's the one I have

http://www.bhphotovideo.com/c/produc...erter_for.html

read this though!

Teleconverters are not recommended for lenses wider than 50mm, e.g. 28-105mm. However, full AF operation is only possible with lenses with open aperture of f/2.8 or brighter. Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the camera's AF sensors. Manual focusing is recommended when using lenses with smaller open f-stop value than those given above.

TD Cole Mar 10, 2011 5:09 PM

And how do you like it Sniper do the pics degrade much etc?
Thanks
EDIT:: Now looking at one that goes on the END of the lens is there any difference to something like that, I did notice its quite a bit cheaper
So I guess I am wondering since Im a noob to dslr, which is the better to get The one that attaches to the body or the one that attaches to the lens itself. I getting kinda lost here the deeper I go...lol

Sniper X Mar 10, 2011 5:27 PM

Quote:

Originally Posted by wagaboo (Post 1207851)
And how do you like it Sniper do the pics degrade much etc?
Thanks
EDIT:: Now looking at one that goes on the END of the lens is there any difference to something like that, I did notice its quite a bit cheaper
So I guess I am wondering since Im a noob to dslr, which is the better to get The one that attaches to the body or the one that attaches to the lens itself. I getting kinda lost here the deeper I go...lol

I have yet to use it on my DSLR since I just got the 30D. BUT I have used it on all three of my 35mm bodies, 1Nrs, A2e, and Elan 2E. All of which worked great as long as there was enough light. I remember having to manually focus when the light was anything but broad daylight and that even at that, AF was slow and "hunted" a bit unless the lens was FAST and light was bright daylight. As far as quality, it works great. I did sell a few pics of a Lion I shot at the Zoo here from using it and a 1~300 F4~5.6.

Sniper X Mar 10, 2011 5:29 PM

I also hear the sharpness will be better with one of these as opposed to one that goes in front of the lens. Also, on those that go in front of the lens, I hear they vignette on the wide end of the zoom lenses.

TD Cole Mar 10, 2011 5:37 PM

Thanks a lot Sniper you are a GREAT help :)


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