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7d and 100-400is

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    andypitstop
    21 Mar 2010 - 10:23 AM

    Hi guy's n Gals,
    I know the 100-400is thing has been done to death, but i'm considering getting one . I had this same issue a few years back and decided to get the 400 5:6 as most of my pics needed full length , but it's really restricting especially at airshows and motor sports. I have read a thread on a different forum and it has come up that its not good on the 7d , so just wondering what you guys have found with the same combinations............Andy

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    21 Mar 2010 - 10:23 AM

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    brian1208
    brian1208 e2 Member 1110293 forum postsbrian1208 vcard United Kingdom12 Constructive Critique Points
    21 Mar 2010 - 12:22 PM

    I evaluated a friends 100-400 on my 7D wiith a view to buying it off him.

    I couldn't get one shot that I considered a "Keeper" after a week of trying, which was a shame because I loved the ability to capture a flying bird at 100mm then zoom out to 400mm to frame it, much easier than trying to capture it at fixed 300mm.

    (I tried using the micro-adjustment and various combinations of focus points etc but nothing seemed to resolve my problems)

    I decided not to go ahead with it because of
    - bad "Bokeh" compared to my 300 f4LIS
    - difficulty in getting moving objects consistently in focus (it wasn't bad with static objects)
    - an overall feeling of unease that I would never be happy with the combination

    I got the canon 1.4TC to go with my 70-200 F4L Is and 300 F4 L IS and am more than happy with the results I now get

    (That's just my experience - I have seen some superb images from this combination so can only put it down to the particular mix of my 7D + the 100-400 I tried)

    edit - should have said, the lens was only a couple of years old and was working fine on his 50D

    Last Modified By brian1208 at 21 Mar 2010 - 12:24 PM
    andypitstop
    22 Mar 2010 - 8:29 AM

    Thanks for the reply Brian....still seams to be no real pattern to good or bad with this lens......still not sure...Andy

    strawman
    strawman  1022010 forum posts United Kingdom16 Constructive Critique Points
    22 Mar 2010 - 9:33 AM

    Andy its a Marmite lens, you love it or hate it, and there is quite variation in performance. Also I have found lenses behave differently on different cameras also when it comes to AF etc. Not selling my 100-400 Smile

    Terry L
    Terry L e2 Member 10577 forum postsTerry L vcard England5 Constructive Critique Points
    22 Mar 2010 - 10:18 AM

    I have to agree with John, my 100-400 was great on my EOS 3, ok on my 10D, absolutely rubbish on my 40D to the point where I was thinking of selling it, then tried it on my 5D mk2 and it performs very well. Take from that what you willSmile

    strawman
    strawman  1022010 forum posts United Kingdom16 Constructive Critique Points
    20 May 2010 - 12:10 AM

    A friend allowed me a shot of their 7D for a bit today and I ran into an issue I hope one of you know the answer to it.

    It was low ish light @ 8pm and on the 100-400 if the lens was focused close up and you switched to a distant target it would not auto focus. If I manually got the lens closer to focusing all would be well. I had my 40D there at the same time and it coped ok. If the lens is focused very close it would wind its focus out then pop back just a touch to lock focus.

    Now the 7D has more focus options than you can throw a stick at, is this an issue of a custom setting or mode. Both cameras were on centre point. Focus from 1.8M to 20M subject not possible on 7D. focus from 10M to 20M possible. When focus was achieved the result was fine.

    danbrann
    danbrann e2 Member 10473 forum postsdanbrann vcard 15 Constructive Critique Points
    20 May 2010 - 3:30 PM

    I use mine on a a 7D shooting wildlife from a hide and rugby I find it a good combination for those and the action stuff is spot on.

    strawman
    strawman  1022010 forum posts United Kingdom16 Constructive Critique Points
    20 May 2010 - 5:01 PM


    Quote: I use mine on a a 7D shooting wildlife from a hide and rugby I find it a good combination for those and the action stuff is spot on.

    Yes but have you experienced the failure to focus I mentioned or do you know of a set up that needs to be looked at.

    danbrann
    danbrann e2 Member 10473 forum postsdanbrann vcard 15 Constructive Critique Points
    20 May 2010 - 7:23 PM

    No I haven't experienced any failure.Mine has been ok. I believe it is equally a good as using my Canon 300mm f4 prime lens although I haven't done side by side tests.

    strawman
    strawman  1022010 forum posts United Kingdom16 Constructive Critique Points
    20 May 2010 - 10:41 PM

    When it focuses its great, but it is the fact it does not try to sweep the focus range that concerns me. I just wonder if there is a mode that needed to be turned on in order to get it to focus the lens in those conditions. At the moment it would stop me upgrading.

    brian1208
    brian1208 e2 Member 1110293 forum postsbrian1208 vcard United Kingdom12 Constructive Critique Points
    21 May 2010 - 8:58 AM

    the 7D does have a setting that determines whether the auto-focus recycles if it misses focus lock. Its one of the Cfn options but I don't have the manual to hand to tell you which. Its an "on/off" option. You would need it "On" to allow it to hunt for focus if it missed it first time

    strawman
    strawman  1022010 forum posts United Kingdom16 Constructive Critique Points
    21 May 2010 - 9:09 AM

    Thanks Brian that may be it, but the funny thing was it did not try to sweep at all. But if there was a hint of objects possibly being in focus it would snap to focus. Something to try out next time. Having said that once focus it was producing keepers.

    Last Modified By strawman at 21 May 2010 - 9:11 AM
    brian1208
    brian1208 e2 Member 1110293 forum postsbrian1208 vcard United Kingdom12 Constructive Critique Points
    21 May 2010 - 5:10 PM

    I've just checked and its in CFn 3. I can produce the same effect with my 300 F4L IS Smile

    Last Modified By brian1208 at 21 May 2010 - 5:11 PM
    strawman
    strawman  1022010 forum posts United Kingdom16 Constructive Critique Points
    21 May 2010 - 6:38 PM

    Thanks Brian I was hoping it was just the camera being a bit more clever than me Smile

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