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DPChallenge Forums >> Hardware and Software >> canon 70-300IS
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 02/21/2006 12:51:47 AM · #1
I am looking at buying this for a long reaching lenses. Of course, never being satisfied, I want more reach without investing tons of money.

So, I am curious if anyone here has used the Tamron 2x SP Pro Teleconverter with the Canon 70-300IS lense and specifically if oyu have some photos to share. Does the IS still work using a telecoverter?

I would appreciate any feedback since I am hoping to buy some new stuff next month.


02/21/2006 08:32:36 AM · #2
bump...

02/21/2006 09:02:57 AM · #3
The 2x converter will lower available Fstops by 2, so when connected to the 70-300 you will loose the ability to auto focus.... see this thread...To Autofocus or Not To Autofocus...
 02/21/2006 10:18:42 AM · #4
Yes IS should still work through a teleconverter.
 02/21/2006 10:29:18 AM · #5
If you really want to know you could send me your TC and I could try it out for you (assuming there's no one who has experiences this). The TC will make it a maximum aperture of f/11 at 600mm.
 02/21/2006 11:44:36 AM · #6
Originally posted by idnic:
The 2x converter will lower available Fstops by 2, so when connected to the 70-300 you will loose the ability to auto focus.... see this thread...To Autofocus or Not To Autofocus...


Thanks for the link to this thread...
 02/22/2006 01:26:57 AM · #7
Just as an FYI, there is a problems with this lens. If you focus past 200mm or so, so that the lens barrel extends out, and you hold the camera in the portrait/verticle position, the barrel will sag a bit and your shots will be soft due to misalignment of the elements.
According to another poster who spoke with a Canon repair center manager, you just have to live with it.

Hence I'd recommend you avoid this lens unless you don't mind this design flaw of this lens.
 02/22/2006 02:12:07 AM · #8
Originally posted by yido:
Just as an FYI, there is a problems with this lens. If you focus past 200mm or so, so that the lens barrel extends out, and you hold the camera in the portrait/verticle position, the barrel will sag a bit and your shots will be soft due to misalignment of the elements.
According to another poster who spoke with a Canon repair center manager, you just have to live with it.

Hence I'd recommend you avoid this lens unless you don't mind this design flaw of this lens.


Was that mentioned here? I have tried to read pretty widely about this lense, but this is the first time I have heard of this problem. If there is any other info about this, I would appreciate knowing it.
02/22/2006 02:54:44 AM · #9
Might want to check dpreview's canon slr forum and do a search. The problem is documented well by fstopjojo.
He also has good shots taken with the lens at pbase.com as well.
 02/22/2006 08:32:11 AM · #10
Actually that problem isn't widespread. I have the lens and don't have any problems and many people also don't have it. Just try out the lens beforehand.
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