Camera Canon 70-200mm f/2.8L or 100-400mm f/4.5-5.6L

Without a TC your Tamron already overlaps the Canon 70-200 - except for the bonus f/2.8 thingy. It is very important to check actual results of using a TC with any given lens (available online) ..... Otherwise the 100-400 is a good enough lens - without TC.
 
Tamron 70-300 will not come anywhere close to the L lenses in image quality or build quality, so switching to one of the two makes sense.

I would take the 100-400 over a 70-200 with a TC. You could add the 70-200 f/4 IS later if you need a compact shorter range lens. It is one of the most brilliant lenses that I have owned.

Actually the 70-200s make great portrait lenses. Great bokeh.
 
70-200 is not a lens for wildlife purposes, its more of a day to day workaround lens. As you already have a 70-300 lens which also is a pretty sharp lens at large aperatures and even at 300mm. If you need more than 300, then you can consider getting 100-400 lens. This lens can give you extra 100mm reach with pretty sharp pictures. If you need more than 400mm lens then you can couple it with 1.4X converter, though it will be 1 stop lesser.
 
since he owns a canon 550d...doesn't 400mm effectively mean 640mm due to the 1.6 crop ratio?

70-200 is not a lens for wildlife purposes, its more of a day to day workaround lens. As you already have a 70-300 lens which also is a pretty sharp lens at large aperatures and even at 300mm. If you need more than 300, then you can consider getting 100-400 lens. This lens can give you extra 100mm reach with pretty sharp pictures. If you need more than 400mm lens then you can couple it with 1.4X converter, though it will be 1 stop lesser.
 
Are you sure spending around 1Lk on the above mentioned lens ? if you are serious on wildlife photography buy 100-400L or 400L 5.6. wildlife photography is a genera where you will end up blowing huge amounts of money.
 
70-200 is not a lens for wildlife purposes, its more of a day to day workaround lens. As you already have a 70-300 lens which also is a pretty sharp lens at large aperatures and even at 300mm. If you need more than 300, then you can consider getting 100-400 lens. This lens can give you extra 100mm reach with pretty sharp pictures. If you need more than 400mm lens then you can couple it with 1.4X converter, though it will be 1 stop lesser.

yes it is not wildlife lens but mounted on apsc camera it gets multiplied by 1.6 and if i mount 1.4 converter then it gets further multiplied. if my calculations are right then it becomes 150-450mm f3.8

Are you sure spending around 1Lk on the above mentioned lens ? if you are serious on wildlife photography buy 100-400L or 400L 5.6. wildlife photography is a genera where you will end up blowing huge amounts of money.

f2.8 is tempting
<
 
for wildlife 100-400 is certainly a better choice letting you get sharper image at tele end in comparison to 70-200 with TC (assuming 2x TC)
 
yes it is not wildlife lens but mounted on apsc camera it gets multiplied by 1.6 and if i mount 1.4 converter then it gets further multiplied. if my calculations are right then it becomes 150-450mm f3.8

f2.8 is tempting
<

Once you are comparing different lenses on the same body, you should forget about the crop factor. Crop factor makes sense if you are regularly used to a FF SLR and then think of an APSC body. Then you can mentally 'ompare' with the crop factor. Most of the guys shooting now have never realy used a FF DSLR, so they are already used to the crop factior FOVs for different leses.

Like I had said the 70-200 is a great portrait lens, and like others have pointed out it's like a type of all purpose but NOT a wildlife lens.

BTW, which lens are you saying becomes a 150-450 f/3.8?
 
...just get the 70-200 f2.8 IS USM

Yes it is not a wildlife lense in the sense of birdiing maybe, but it is really suited for our indian wildlife safaris...

I have used my 70-200mm with the 1.4 Convertor much more than 400mm for wildlife, it is a great lense for what you require IMO.

My dad uses the 400 more because he likes a lot of birding, but if thats not your focus then the 70-200 is very well suited.
 
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