Extenders / Apperture Effects

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cheech

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Hi,

I wonder if someone would clarify this for me please?

If you have a f2.8 70-200 lens with a 2x entender, the apperture at 400mm would go down to 5.6 ?
At 140 would it still be 5.6 or will it go lower ?

Thanks
 
cheech said:
Hi,

I wonder if someone would clarify this for me please?

If you have a f2.8 70-200 lens with a 2x entender, the apperture at 400mm would go down to 5.6 ?
At 140 would it still be 5.6 or will it go lower ?

Thanks
Click to expand...

The moment you put a 2x extender on, f/2.8 becomes f/5.6. Always.

But you'd be a mug to use an extender until you've run out of reach with the bare lens, and of course you can do 140mm without it, at f/2.8 and with better image quality.
 
Hi
Thanks guys, I just can't make up my mind whether to get a 70- 200 II or a 100-400 L.
I use mostly at large end for wildlife when I am away working, but like the sound of the f2.8 when back home, can't justify both !
 
cheech said:
Hi
Thanks guys, I just can't make up my mind whether to get a 70- 200 II or a 100-400 L.
I use mostly at large end for wildlife when I am away working, but like the sound of the f2.8 when back home, can't justify both !
Click to expand...

No brainer, if you can afford it. I'm not saying which one, but it begins with a 7.
 
I have the 70-200/2.8L IS II and a 2x extender (mk2), and even though the new 70-200 is really really nice and works well with the 1.4x, wouldn't really recommend the 2x combo to anyone. It's passable in an emergency but I rarely even take the 2x with me.

If you think the extender will be needed most of the time, buy the 100-400 or 400/5.6 instead. If it's just occasional use, get the 1.4x and crop :D
 
Thanks Jukka,

I think that is what I wanted to hear.
Bit lighter on the bank balance too !
 
If you want 400mm, it is always better to start with 400mm. Even if the 70-200 MkII runs it close with a x2.

The big advantage of the zoom/extender combo is of course the 70-200 2.8 which comes as part of the deal.
 
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