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Canon Extender question
Old 10-19-2005, 10:19 PM   #1 (permalink)
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I was wondering if anyone has any experience with the Canon Extenders. I am worried about buying one and it degrading the quality of the shot. I have a prime lens and wanted to know if it will do anything to the final image. I read that they will drop down the exposure one fstop but dont know of anything further...
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Re: Canon Extender question
Old 10-19-2005, 11:07 PM   #2 (permalink)
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the 1.4x loses one stop, the 2x loses two...and while they are good not as good as an equal Prime lens...I own both and use them on 300 and 400mm F2.8

Tripod time...remember it magnifies any moveement of subject as well as camera!
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Re: Canon Extender question
Old 10-19-2005, 11:13 PM   #3 (permalink)
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I am fine with 2 stops, as i am under strobes anyway, so i can compensate somewhat but is the lens quality lost, is the sharpness lost in the image is my concern... or are images softer?
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Re: Canon Extender question
Old 10-20-2005, 07:17 AM   #4 (permalink)
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There is some loss surely, but it may be hard to see...but I can't imagine a case using extenders to lenghten a lens when using strobes...Canons are designed for use with prime lenses over 300mm and one of the 2x under 300mm...normally for sports /wildlife
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Re: Canon Extender question
Old 10-20-2005, 09:15 AM   #5 (permalink)
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In addition to what's already been said, I don't think any of the lenses you listed are compatible with Canon's extenders. The Canon extenders have an element that sticks out beyond the casing of the tube which fits inside the rear mount 'hole' of the lens you're extending. 3rd party makers like Kenko and Sigma offer extenders that will fit but I can't vouch for the quality. So, unless you're buying a new prime or compatible Canon zoom, like the 70-200 2.8L for example, you should check before you buy an extender.

MG
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Re: Canon Extender question
Old 10-20-2005, 09:42 AM   #6 (permalink)
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thanks I was wondering if I could avoid buying a zoom and just get an extender, but i will scrap that idea and just buy the zoom... So now saving my lunch money and going after the 70-200 2.8L...
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Re: Canon Extender question ...Multi Image
Old 10-20-2005, 12:08 PM   #7 (permalink)
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[ QUOTE ]
There is some loss surely, but it may be hard to see...but I can't imagine a case using extenders to lenghten a lens when using strobes...Canons are designed for use with prime lenses over 300mm and one of the 2x under 300mm...normally for sports /wildlife

[/ QUOTE ]

Yep,...there is loss of image quality, that is true... the 1.4x is not too bad, but the 2.0x is much more noticable on prints larger than 5x7.. but,...what are you going to do if you don't have enough reach..

They also decrease depth of field, wich is good for me,....and decrease auto focus sensitivity....much like any f4.0 or f5.6 would in comparison to an f2.8 lens..

The list (that I am familiar with are:

135mm f2.0 L
70-200mm f2.8L/IS
200mm f2.8L
200mm f1.8L
300mm f2.8L/IS
300mm f4.0L/IS
400mm f2.8L/IS
400mmf4.0DO
400mmf5.6L
500mmf4.5L & f4L IS
600mm f4L/IS
I'm not so sure about the 100-400, 35-350, or 28-300.. perhaps someone else would know..

These shots were taken with the 135mm f2.0L & 2x....(because I didn't have my longer lenses with me when I saw this unfold right in front of me.., but I did have my extenders in the side pouch of my bag..


This shot was taken with the 400mm f2.8II & 2.0x = 800mm f5.6 and shot on neg film, Fuji 800iso..


This was taken with the 300mm f2.8 and 2.0x ...it is "acceptable looking" to me


Here is the 300mm w/o an extender,...in a very demanding situation... no way could the AF of the 10D have nailed this shot if I had either of the extenders..



In all honesty,.... the sharper the lens, the better results you'll get from using the extenders...and I don't think the 70-200mm L produces acceptable images with the 2.0x.. with the 1.4x, it's pretty good.. Keep in mind, a "420mm" focal length from a 300mm with a 1.4 on it is no substitute for a 400mm f2.8 prime..or a 70-200mm with a 1.4 on it to the 300mm f2.8 prime.. no way..


JP
 
 
Re: Canon Extender question ...Multi Image
Old 10-20-2005, 01:57 PM   #8 (permalink)
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Thanks so much John, I am going to drop the extender idea for now and go after the 70-200 2.8L. I dont see needing anything longer for right now... i will use it primarily in studio, not too many outdoors.
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Re: Canon Extender question ...Multi Image
Old 10-20-2005, 08:06 PM   #9 (permalink)
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[ QUOTE ]
Thanks so much John, I am going to drop the extender idea for now and go after the 70-200 2.8L. I dont see needing anything longer for right now... i will use it primarily in studio, not too many outdoors.

[/ QUOTE ]

You are going to love that lens! [img]/ubbthreads/images/graemlins/smile.gif[/img]

Enjoy!

JP
 
 
Re: Canon Extender question ...Multi Image
Old 10-20-2005, 08:20 PM   #10 (permalink)
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yeah, just the 1600 i am not, lol... need more work to justify the purchase...
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