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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 02 May 2011 (Monday) 10:33
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Canon 1.4 extender or 7D?

 
blk-dslr
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May 02, 2011 10:33 |  #1

currently I own a canon 5D II and a 70-200mm f/2.8L II and wanting to extend it by atleast 1.4x and was wondering would it be better to get canon 7D body that is 1.6x crop or just get a 1.4x extender, how are the IQ compare?


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richierich1212
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May 02, 2011 10:36 |  #2

wow you have a lot of Ls.........back on topic: Yes spring for a crop body because if you use an extender your lens won't be able to use f/2.8


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gjl711
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May 02, 2011 10:39 |  #3

Hmm.. this could be an interesting experiment. Does the higher pixel density of the 7D offer enough of an advantage so that a t-con is not needed on a FF body.

If I do the math, the pixel density of the 7D is 1.49 times the 5DII so the math comes really close. Maybe it's time to break out my ISO12233 chart and give it a go. I have a 1.4 T-con and both the 7D and MkII.


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Brian_R
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May 02, 2011 10:41 |  #4

thats a great question i would love to hear what the result it




  
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Equoria
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May 02, 2011 11:07 as a reply to  @ Brian_R's post |  #5

GREAT QUESTION.......subscri​bed


(sorry if this practice is frowned upon))




  
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May 02, 2011 11:11 |  #6

Adding TC adds a stop less aperture (and thus your exposure), something to remember. Using a camera that has a smaller sensor to crop that image out for you allows you to use the lens as it was intended... Also going with a FF+1.4x, you end up with the headache of putting on/taking off the TC quite a bit, alot of work for 80mm more reach which isn't all that much IMO.

200mm on a crop body yields a FF view of 320mm, putting a 1.4x w/200mm on the FF yields 280mm with 1 reduced stop....


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NeutronBoy
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May 02, 2011 11:12 |  #7

richierich1212 wrote in post #12332661 (external link)
Yes spring for a crop body because if you use an extender your lens won't be able to use f/2.8

He will lose a stop anyway with the TCON. I would say to go for the TCON and be able to use it on other lenses too, unless there is a definite need for another body.


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May 02, 2011 11:14 |  #8

seeing that you have all the L glass, I would go for the 7D (: I think this option will open up more opportunities in shooting in many situations that the 5D can't. Sports maybe?


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May 02, 2011 11:14 |  #9

Equoria wrote in post #12332847 (external link)
GREAT QUESTION.......subscri​bed


(sorry if this practice is frowned upon))

No reason to reply to subscribe, if that is your question. Just use the thread tools in the upper right, and you can subscribe from there. :)

Welcome to POTN, this will invariably turn into another one of those XXXmm is really YYYmm on camera A vs B, then it will turn into a "you are wrong, you get a view of YYYmm, etc".

:lol:


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May 02, 2011 11:51 |  #10

TeamSpeed wrote in post #12332898 (external link)
Welcome to POTN, this will invariably turn into another one of those XXXmm is really YYYmm on camera A vs B, then it will turn into a "you are wrong, you get a view of YYYmm, etc".

:lol:

^^^^ :lol:

I have the 5D MKII, 60D, & the 450D and believe or not the IQ might not be quite as good but the AF performs the best on the 450D XSi body using just the center focus point.

IQ is the best with the 5D MKII, the 60D works fine, but the 7D i sold was the most finicky of the bodys when using the extenders i assume due to its advanced AF system.

In regards to the OP`s original question i would simply purchase a 1.4 TC for the 5D MKII + 70-200MKII

I see virtually NO IQ degradation with this combo. The MKII is a stellar lens.

Regards & Have Fun ! ;)


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alessandro2009
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May 02, 2011 13:00 |  #11

7d: a lot better AF.
No light lost on the lens.
And with two bodies if a day happen somethings at one of them you can use the other (even if the final quality, especially at high iso, is different).
Or if you make some work you are more safe.




  
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May 02, 2011 15:57 |  #12

Since you also own a 100-400 and a 50-500, I assume you would benefit more from the 7D since it could also extend those lenses.


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joonrhee
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May 02, 2011 18:43 |  #13

bob_r wrote in post #12334501 (external link)
Since you also own a 100-400 and a 50-500, I assume you would benefit more from the 7D since it could also extend those lenses.

+1 :D

5dmkii + 1.4xII combo is very nice too. and cheaper... not much loss in IQ at all!!


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actprivate
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May 02, 2011 22:59 |  #14

You might like to have a look here - not exactly 5D2 vs 7D but close (1Ds3 vs 7D):

http://www.the-digital-picture.com …p=673&FLIComp=0​&APIComp=0 (external link)

This can be used as an indication. I chose a sharp prime (200L IS) for simplicity. It seems to me that 200L + 7D is better in midframe whilst FF + 1.4X II is better in centre and in corners.

As far as versatility of two bodies and retaining faster aperture and its effect on AF goes, 7D would be a better path to go - as suggested above. :-)


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May 02, 2011 23:26 |  #15

actprivate wrote in post #12337026 (external link)
You might like to have a look here - not exactly 5D2 vs 7D but close (1Ds3 vs 7D):

http://www.the-digital-picture.com …p=673&FLIComp=0​&APIComp=0 (external link)

This can be used as an indication. I chose a sharp prime (200L IS) for simplicity. It seems to me that 200L + 7D is better in midframe whilst FF + 1.4X II is better in centre and in corners.

As far as versatility of two bodies and retaining faster aperture and its effect on AF goes, 7D would be a better path to go - as suggested above. :-)

I dont know what you were looking at but take another look below:

http://www.the-digital-picture.com …omp=0&FLIComp=0​&APIComp=4 (external link)

No way can the 7D or 60D produce the same IQ results as the 1Ds MKIII or the 5D MKII i assure you:

http://front1.dxomark.​com …/Canon/%28brand​3%29/Canon (external link)


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Canon 1.4 extender or 7D?
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