kevindurose
Well-known member
Rob,
I cant see your thinking here, extra pixels aint the same thing as extra magnification.
Kev
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7D BIF shots (1 Viewer)
- Thread starter HokkaidoStu
- Start date
Rob,
I cant see your thinking here, extra pixels aint the same thing as extra magnification.
Kev
Jaff
Registered Member
Does that enhanced centre focus point still work if you use a f2.8 lens combined with a TC?
Here's one from this morning with AF expansion...........
Some cropping and minor postprocessing.
EXIF data should be intact. I could have gone down to ISO 200 I suppose.
I've been checking this link from Canon about the various AF options, it's quite a bit to digest for someone like me coming directly from a 400D.
AF expansion vs Zone AF? Dunno, you'd need to ask a better photographer than the likes of me. Both seem OK I have to say but these Night Herons weren't flying so fast so maybe I'd need a more difficult subject to see which is better in more challenging conditions. In the meantime I've set aside 2 custom functions for BIFs, one using AF expansion and the other Zone AF.
Some cropping and minor postprocessing.
EXIF data should be intact. I could have gone down to ISO 200 I suppose.
I've been checking this link from Canon about the various AF options, it's quite a bit to digest for someone like me coming directly from a 400D.
AF expansion vs Zone AF? Dunno, you'd need to ask a better photographer than the likes of me. Both seem OK I have to say but these Night Herons weren't flying so fast so maybe I'd need a more difficult subject to see which is better in more challenging conditions. In the meantime I've set aside 2 custom functions for BIFs, one using AF expansion and the other Zone AF.
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Roy C
Occasional bird snapper
Good point Adam, I would think not but do not know for sure.
GYRob
Well-known member
GYRob
Well-known member
No because your then at f4 - 1.4tc or f5.6 2x tc.
Now i dont know about the non reporting TC such as the tamron .
Rob.
EDDIT
Just got a reply fron canon forum.
(the input information will be inaccurate so you wont get the enhanced focus with a non reporting tc )
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hollis_f
Well-known member
Not sure I believe that answer. The AF system will think you have an f2.8 lens attached so it will use the enhanced focus system.
Roy C
Occasional bird snapper
I was thinking the same Frank - all the camera will see is a f2.8 lens.
I tried briefly with the (taped) Kenko Teleplus pro out of the window and it hunted a lot.
I was thinking I'd be saving T/Cs for tripod work anyway, especially with the video where reliable AF is kind of irrelevant once the shooting starts.
Nikon Kid
Love them Sula Bassana
Thanks for trying.................
It did work some of the time though. I'll try it again on sunny days with contrasty subjects.................like the Stellers Sea Eagles that overwinter near here for example.
I don't know if it's any good for BIFs to be honest. I'd use it for when the Eagles sit nice and still in the trees.
Paul Jarvis
Registered Member
Not sure if it has been mentioned, but will the 7D AF and the IS work when using say a 300 F4 coupled with a 2x TC.
Roy C
Occasional bird snapper
No, the AF is limited to f5.6 for AF Paul just like the xxD cameras . There are mixed messages about how well it AF's with a taped tc and f5.6 lens.
Paul Jarvis
Registered Member
thanks Roy.
GYRob
Well-known member
I had another go with the 7D plus 100-400L/1.4 taped T/C on a tripod out of the window and didn't get much joy to be honest. I don't think I'll be using it much, I'd hate to miss a once in a lifetime shot because the AF couldn't lock on and by the time I manually focus the bird has gone.
But, as I said before, it'll be great for video.
But, as I said before, it'll be great for video.
Roy C
Occasional bird snapper
There seems to be mixed message on this Stu - I was reading a post on another forum where one guy reckoned he got reasonable AF on the 7D with a taped 2x tc and 100-400 (hard to believe!) but the very next post was from someone who reported poor AF with a taped 1.4 and the same lens, just like you.
Nikon Kid
Love them Sula Bassana
Thanks HokkaidoStu for trying it out again, I just thought that with a new camera they might have improved something that would give you better AF with a TC on a 400mm f5.6, but Roy I would I be right in thinking that on your 300mm f2.8 it should AF OK with a TC ?
