Canon 2x and 1.4x mk3 extenders
- Thread starter Alex
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I tried this last night with my 70-200 f/2.8 IS II and it worked! The camera saw the setup as an f/5.6 lens and that allowed me to select all 61 AF points on my 5DIII. I was indoors at night so there was not a lot of light, so there was a problem locking focus, but I am not sure if that was because of trying to use 560mm of lens in my living room, or the low light. But the AF motor was searching! I will be trying this again outdoors this weekend and also with my new 300 f/2.8 IS II that I should be getting Thursday!
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Here's an extension tube combo I've used to good effect:
5DIII - 2X converter - 12mm extension tube - 50mm f/1.4
This combo creates a pretty decent macro lens
Tip: focus the 50mm close before attaching to the extension tube
Set aperture at least f/8 to f/16
BTW - works well with the EOS-M+adapter as well... gains 1.6x crop factor
5DIII - 2X converter - 12mm extension tube - 50mm f/1.4
This combo creates a pretty decent macro lens
Tip: focus the 50mm close before attaching to the extension tube
Set aperture at least f/8 to f/16
BTW - works well with the EOS-M+adapter as well... gains 1.6x crop factor
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Very cool, but let me ask this: Is this combo getting you better results than just cropping? I'm not saying it is not, but that is the thing about a teleconverter, or combination of converters is it has to outperform just cropping the image.
If you shoot the moon with just the 2.0X and then crop, is there less less detail?
If you shoot the moon with just the 2.0X and then crop, is there less less detail?
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wopbv4 said:
Live view will focus even way outside the limits. I've used it to focus (outdoors on a sunny day) with a 70-300L (4-5.6) and a 3x extender at the 300 end (f/16.8, effectively). No sweat. Just a little slow (and by that, I mean painfully slow, but that's live view for you).
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A Canon 12mm tube isn't cheap and I don't know how reliable the el cheapo ones are so I don't want to do an experiment myself.
So what do you think would give the better image:
A good f/2.8 lens with a 2xTC at f/5.6 on a 7d (e.g. the f/2.8 300mm II + the 2xTC III)?
Or the same lens plus 1.4x and 2xTC at f/8 on a 5D III?
Both have a similar reach.
So what do you think would give the better image:
A good f/2.8 lens with a 2xTC at f/5.6 on a 7d (e.g. the f/2.8 300mm II + the 2xTC III)?
Or the same lens plus 1.4x and 2xTC at f/8 on a 5D III?
Both have a similar reach.
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AlanF said:
There is no glass in the 12mm tube. I have an el cheapo and it works find. Mind it wasn't that cheap. Having had all that kit I wouldn't hesitate to recommend the 5D3. In fact I think you will find that the 5d3 + 2xTC + 300mm f2.8 will give just as much reach as the 7D + 2xTC + 300mm f2.8 because you can crop harder for the same IQ. And of course you will still have the 1.4TC to add for a bit more reach.
Not everyone will agree with this and will be convinced that the greater pixel desity of the 7D will make up for the improved IQ of the 5D3. Guess what I won't lose sleep over their opinion.
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No need to do the experiment. I took out both my 5DIII and 7D yesterday to test in the wild in a nature reserve. I had forgotten how slowly the 7D focusses with the 300mm f/2.8 II with the 2xTC attached. Whereas the 7D is fine with the native lens, it is painfully slow with the 2xTC III attached. So, I might get a cheaper 12mm ring for the fun of it ot see what it does.
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