Canon 100 X 400 4.5 5.6 L IS 11 USM + 1.4 Mark 11 Extender - Focusing Isues

[Rsharman]

I have just bought this lense to use with my 7d Mark 11 camera and am experiencing problems with focusing at 60/70 yards at 400 with extender. I use AI Servo for birds in flight. F8 - 11. Speed between 500 and 3200. IS0 Auto max 3200. Tracking case 1. It seems to be better at slow rather than fast speeds! Pretty good up to 40 yards using One Shot Mode. I use Centre spot or Extended Cross - can't expand further using using extender. Have not changed Microadjustments. I shoot hand held - birds in flight don't stay still! Have tried all 3 stablizer settings. I have been quite experenced and had good results up to now using my 300mm prime lense. I purchases the 100 X 400 with Extender to obtain better reach as I am missing some shots - very disappointed so far!!Any advice would be most welcome. Thanks in advance.

Richard Sharman

[Rsharman]

I think the lense is OK because I have had some good shots at under 40 / 50 yards. I agree, I need to do a series of test shots at AI Servo and One Shot with and without Extender. I will also try taking off my UV filter. I also want to try Case 2 as you previously suggested.

Thanks again

Richard

[ebiggs1]

 Are you shooting Raw format?  If you shoot Raw abd you have PS, you can do lens correction in ACR upon opening.  Let's try that.

Can you post a few samples? 

[Rsharman]

Hi ebiggs 1 

Thanks for your last message. I do shoot in RAW and have applied lens correction in ACR. The first 2 images a shot at about 40/50 without extender. The others (horrible) are shot at about 70 yards with extender. In fairness the light was much better with the first 2.

Thanks

[ebiggs1]

Richard the first two are simply fantastic. 

 I don't think there is anything wrong with your lens.  I also think that is the way it is going to perform.  The settings are drastically different in the first two as opposed to the last two.  As the distance increases the resolution of any lens gets worse. Plus there is a lot of difference between the short end and long end of the zoom range.

The first two prove the lens and camera and you are preforming at a high level. So I do believe the addition of the distance, the tel-con and longer FL is giving you all it can.  You know the best thing you can do to improve any lens is get closer.

There are guys that shoot for years and never get a shot like the first egret!

[Rsharman]

Hi Ebiggs1

Thanks for your kind comments on shots 1& 2. I think I may have found a reason for the bad shots at distance shooting. Somehow AI Servo Priority has been switched to neutral instead of Focus Priority - I dont know how that happened. I think I had C3 (which I use for slow moving shots) set to Neutral and then Registered those settings on C1 and C2 ( which I use for faster moving, bright day shots). Also I have now altered my Back Button settings using AF-On. I have some good weather forcast for this PM so I hope to get some shots in. I will let you know how it goes.!!

Many thanks for your time and advice. 

Kind Regards

Richard

PS are you on Flickr

[ebiggs1]

I hope it works the way you desire.  But do keep in mind more distant shots are not going to be as sharp as closer ones.  Every lens has a fixed amount of resolving factor.

"PS are you on Flickr"

Yes I do but I haven't used in for years.  Right now my main most thing is work for the local school district.  And, it is yearbook season so I will be busy for a while.

[RobertTheFat]

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ebiggs1 wrote:

I hope it works the way you desire.  But do keep in mind more distant shots are not going to be as sharp as closer ones.  Every lens has a fixed amount of resolving factor.

... 

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Also, the farther you are from your subject, the more you're at the mercy of water vapor, particulate matter, etc., in the air. Anything through which the light has to travel can cause loss of IQ.

[ebiggs1]

Not a real recent shot but an interesting one anyway.  It was with my ef 400mm f5.6L.  It was just a super quick snap shot as it lasted for a mere second or two.  It's good to be lucky!  The luckier you are the better photographer you will be.  ANd the better photographer you become the luckier you will be.

[RobertTheFat]

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@ebiggs1 wrote:

Not a real recent shot but an interesting one anyway.  It was with my ef 400mm f5.6L.  It was just a super quick snap shot as it lasted for a mere second or two.  It's good to be lucky!  The luckier you are the better photographer you will be.  ANd the better photographer you become the luckier you will be.

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!!

[ebiggs1]

Something is not the same!