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nellyleelephant
1,786 posts
103 months
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flat-planedCrank said: dibbly dobbler said: nellyleelephant said: That's right, focus speed will slow a little too. Hmph - seems stretching it to say the 2x is 'fully compatible'? Not much cop if it wont even autofocus  Sounds like the perfect excuse to buy a 1DX?  Not sure if that is sarcasm or not, but the 1DX is actually the first of the digital 1 series bodies to not be able to focus at f8!
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dibbly dobbler
6,572 posts
66 months
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flat-planedCrank said: Sounds like the perfect excuse to buy a 1DX? Et tu FPC?! 3hero is already trying to bankrupt me! 
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flat-planedCrank
2,954 posts
72 months
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nellyleelephant said: flat-planedCrank said: dibbly dobbler said: nellyleelephant said: That's right, focus speed will slow a little too. Hmph - seems stretching it to say the 2x is 'fully compatible'? Not much cop if it wont even autofocus Sounds like the perfect excuse to buy a 1DX? Not sure if that is sarcasm or not, but the 1DX is actually the first of the digital 1 series bodies to not be able to focus at f8! Considered saying it was a multi-layered joke.... ....but no, didn't know that about the 1DX 
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flat-planedCrank
2,954 posts
72 months
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dibbly dobbler said: flat-planedCrank said: Sounds like the perfect excuse to buy a 1DX? Et tu FPC?! 3hero is already trying to bankrupt me!  Can grab his 70-200 2.8 mk2 for the 2x converter though? 
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5hero
2,496 posts
26 months
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dibbly dobbler said: Hmph - seems stretching it to say the 2x is 'fully compatible'? Not much cop if it wont even autofocus If only you kept your 100-400...
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5hero
2,496 posts
26 months
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Thinking about it, I'll sell you my 70-200 MKII and buy it back from you for less next week when you get bored with it? Deal?
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dibbly dobbler
6,572 posts
66 months
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flat-planedCrank said: dibbly dobbler said: flat-planedCrank said: Sounds like the perfect excuse to buy a 1DX? Et tu FPC?! 3hero is already trying to bankrupt me! Can grab his 70-200 2.8 mk2 for the 2x converter though? I've been working on him for a shot of his 2.8 but rumours persist that it never leaves his side and can be found stashed in his front pocket at all times 
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5hero
2,496 posts
26 months
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You can have it from next Tuesday until Friday if you like Mike?
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dibbly dobbler
6,572 posts
66 months
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5hero said: You can have it from next Tuesday until Friday if you like Mike? You're a god  I'm going to have to insist that I stand you lunch though
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dibbly dobbler
6,572 posts
66 months
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5hero said: If only you kept your 100-400... More of a man than I was ...
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dibbly dobbler
6,572 posts
66 months
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5hero said: Thinking about it, I'll sell you my 70-200 MKII and buy it back from you for less next week when you get bored with it? Deal? Git
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5hero
2,496 posts
26 months
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dibbly dobbler said: Cool, I'll bring it in on tuesday All bar one?
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dibbly dobbler
6,572 posts
66 months
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5hero said: dibbly dobbler said: Cool, I'll bring it in on tuesday All bar one? Sorted - will text
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LongQ
8,837 posts
102 months
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dibbly dobbler said: flat-planedCrank said: Sounds like it's refering to the f5.6 limit for non 1D camera bodies?
So your 70-200 f4 will become a 140-400 f8 (with a 2x converter, presuming you lose 2 stops) - so a 'non pro' camera won't have and af.
The 1.4x converter only loses 1 stop of light, so that'll become a 98-280 f5.6 = AF will be ok (but I'd expect some reduced af performance over normal use) Thanks So just to be totally clear, on my 60D - a 2x will lose 2 stops and AF, but a 1.4x will lose 1 stop and retain AF ? 60D has 9 focus points with sensitivity to f5.6 on all of them except the centre point which is more sensitive offering f2.8. So for the centre point you can add 1 stop to the lens maximum apperture and still have AF. Add 2 stops and it's no go. Using the f2.8 capable 70-200 lenses you can still get AF at the centre spot with a 2x extender. The later 1D bodies (Except the new 1D X apparently) allow centre point AF focusing sensitivity to work f8 so and f4 lens plus 2x Extender would be fine. Or, in theory, an f2.8 +2x extender + a bit of Polariser .... but the results cab be very, r, not as anticipated. Iirc the 7D and 5DIII have additional high sensitivity AF points in their arrays for the f2.8 level but nothing that allows sensitivity for AF at the f8 combined level. All of this can get rather confusing so so here's a nice little 'written for the person in the street' article that explains it comprehensively in a way that the average 8 year old child would understand. By that I mean that anyone much over 8 will probably end up with more questions than answers. I read the Canon official explanation somewhere once. I'll see if can find it again. ETA: Most of the points (no pun intended) I made here were covered by others whilst I was off trying to find some understandable documentation .... oh well. BTW, on the 600D a very quick and dirty hand held test of moon shots a couple of weeks back suggested that there was little difference in the results between a 70-200 f2.8 IS MkII at 200mm (320mm in FF money) and the same lens with a 2x Extender MkII at 400mm (640mm in FF money) if the images were viewed at the same size on screen. However I was not entirely convinced by that so will be repeating the exeperiment if we ever get another night with the moon in the right place for my visibility absent street lights and no cloud.
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mikef
1,382 posts
120 months
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I ordered the 70-200 f2.8 IS II yesterday from pixel_uk, due for delivery tomorrow. OK, it will be a grey import, but I usually buy kit from B+H Photovideo in NY, so no worse off.
Yesterday £1,485 - today they have it for £1,599...
Every equine photography course and book has said this is the lens, maybe will need the 2x Mk III extender for the Olympic eventing though?
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flat-planedCrank
2,954 posts
72 months
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mikef said: I ordered the 70-200 f2.8 IS II yesterday from pixel_uk, due for delivery tomorrow. OK, it will be a grey import, but I usually buy kit from B+H Photovideo in NY, so no worse off.
Yesterday £1,485 - today they have it for £1,599...
Every equine photography course and book has said this is the lens, maybe will need the 2x Mk III extender for the Olympic eventing though? It's an awesome bit of kit Crazy sharp... For the olympics - do you have a media pass or are you spectating? IIRC there are rules on what photography gear you are allowed? May be different for each venue too?
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2slo
1,565 posts
36 months
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I use the 70-200 f/2.8 a lot on both a 7D and a 1D iv. I have nothing bad to say about the lens, it can produce superb results. Whilst I haven't tried it with the 2x TC I quite often use it with a Canon 1.4x TCIII and find very little loss of image quality. Happy to post some shots if you're interested.
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mikef
1,382 posts
120 months
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flat-planedCrank said: For the olympics - do you have a media pass or are you spectating? IIRC there are rules on what photography gear you are allowed? May be different for each venue too? Just spectating  . All I've seen is no flash at Greenwich - will have to check before the event...
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mikef
1,382 posts
120 months
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2slo said: I use the 70-200 f/2.8 a lot on both a 7D and a 1D iv. I have nothing bad to say about the lens, it can produce superb results. Whilst I haven't tried it with the 2x TC I quite often use it with a Canon 1.4x TCIII and find very little loss of image quality. Happy to post some shots if you're interested. Yes, I would be interested, thanks, especially in performance at lower light (thinking ahead to early morning safari drives)
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dibbly dobbler
6,572 posts
66 months
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LongQ said: 60D has 9 focus points with sensitivity to f5.6 on all of them except the centre point which is more sensitive offering f2.8. So for the centre point you can add 1 stop to the lens maximum apperture and still have AF. Add 2 stops and it's no go. Using the f2.8 capable 70-200 lenses you can still get AF at the centre spot with a 2x extender. The later 1D bodies (Except the new 1D X apparently) allow centre point AF focusing sensitivity to work f8 so and f4 lens plus 2x Extender would be fine. Or, in theory, an f2.8 +2x extender + a bit of Polariser .... but the results cab be very, r, not as anticipated. Iirc the 7D and 5DIII have additional high sensitivity AF points in their arrays for the f2.8 level but nothing that allows sensitivity for AF at the f8 combined level. All of this can get rather confusing so so here's a nice little 'written for the person in the street' article that explains it comprehensively in a way that the average 8 year old child would understand. By that I mean that anyone much over 8 will probably end up with more questions than answers. I read the Canon official explanation somewhere once. I'll see if can find it again. ETA: Most of the points (no pun intended) I made here were covered by others whilst I was off trying to find some understandable documentation .... oh well. BTW, on the 600D a very quick and dirty hand held test of moon shots a couple of weeks back suggested that there was little difference in the results between a 70-200 f2.8 IS MkII at 200mm (320mm in FF money) and the same lens with a 2x Extender MkII at 400mm (640mm in FF money) if the images were viewed at the same size on screen. However I was not entirely convinced by that so will be repeating the exeperiment if we ever get another night with the moon in the right place for my visibility absent street lights and no cloud. Thanks LQ Unfortunately you lost me at the first sentence! What does 'sensitivity to f5.6 mean' ? I can focus my 100L at f2.8 so this doesn't make sense to me sorry. If I understand your last point then if I get a 70-200 + 1.4 and just crop in a bit more then I should be good to go ?
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