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  4. Can you stack two teleconverters on top of each other?

Can you stack two teleconverters on top of each other?


11 years 4 months ago #264532 by FunnyGuy
So if you have 2 2x teleconverters on a 70-200mm lens, would that lens become 600mm or 800mm at top end?
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11 years 4 months ago #264535 by Joves
I am sure you can stack them. BUT! You will lose 4 stops, and getting a usable photo will most likely be low percentage. Because one 2x can degrade an image all by itself well enough if you do not nail the focus and exposure. So you will have doubled that problem. Then there is the matter of adding more optical elements into the equation for light reflection internally. I have seen that some birders have used stacked converters in a 1.4&2x combination, but say they had a keep rate of up to 15% in good lighting conditions, and on a good day. So yes you can stack them, but do you want to is the question.
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11 years 4 months ago #264547 by FunnyGuy
So much for that one. 15% isn't all that good, well I guess there is no substitute for going out there and buying 500mm lens.

Any chance do you know much about the Sigma 150-500mm? I wonder how that lens would fair with a 1.4x converter?
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11 years 4 months ago #264604 by effron
The 500mm is pricey of course. The Sigma 50-500 and 150-500 get some good reviews, seems there are good copies and a few not so good.. Also, if budget is important look at the Nikon 300f4 afs. I sometimes use a 1.7 TC on mine with pretty good results.
Why so serious?
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11 years 4 months ago #264633 by EOS Man
That's a great lens for the money. What are you looking to photograph with this?
5D Mark II | 50mm f/1.4 EX | 24-70mm f/2.8L | 70-200mm f/2.8L | 430EX
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11 years 4 months ago #264673 by Ben Mayer

effron wrote: The 500mm is pricey of course. The Sigma 50-500 and 150-500 get some good reviews, seems there are good copies and a few not so good.. Also, if budget is important look at the Nikon 300f4 afs. I sometimes use a 1.7 TC on mine with pretty good results.



Very nice lens! Do you own the 300mm f/4?
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11 years 4 months ago - 11 years 4 months ago #264749 by Henry Peach
I remember an article in a magazine back in the film days. The photographer was stacking more than two TCs. Like up to 4. He was shooting surfers against the sun from the shore, and his photos were unlike anything I've ever seen.

As a rule: no, you don't stack teleconverters. Sometimes you have to break the rules.
mattneedham.zenfolio.com
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