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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 03 Feb 2011 (Thursday) 21:52
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Canon 400mm focus issues

 
gasrocks
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Feb 04, 2011 08:30 |  #16

And in distant shots how big is the subject vs. your AF point? You may be asking a lot for it to find the right thing each time. One reason I only use MF for wildlife.


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bobbyz
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Feb 04, 2011 08:54 |  #17

If these are full frame (not cropped) then your subject is not that far. Also post some crops of the area where you focussed to see how it looks. At these small web size, most lenes will look good.

And do what gasrocks said about the Live View test.


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JonK
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Feb 04, 2011 09:07 |  #18

1/500 is too slow to get a high keep rate. Shoot it around 1/1600 - 1/2000. I couldnt shoot a 500mm f4 @ 1/640 or whatever without the IS on.


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LiberationFrequency
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Feb 04, 2011 09:15 |  #19

1/500th on a crop with a 400L isn't enough in my opinion. 1/640th minimum if its on a crop.

I shoot with 1/320 @ 200mm on a crop and that sometimes isnt enough, and hand shake is exacerbated by longer focal lengths so the 400 would be tricky. Bump up the ISO and shoot @ 1/1000 or higher and see what happens.




  
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norf
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Feb 04, 2011 09:32 |  #20

it also doesn't help that your subject is soft and fuzzy.

but i agree 1/500 is not enough. with all that snow you should be able to get 1/1000 easy.




  
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supercar
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Feb 04, 2011 13:49 as a reply to  @ norf's post |  #21

In my case I was shooting eagles that were definitely over 100 yards away. I was able to get some shots at 1/2500th of a second and F/7.1. This should have provided something like 50ft of depth of field and 1/2500th seems fast enough.

When I get time I will try a test with a tripod, MLU and a remote trigger to see how it looks.

Is there any chance that a lens could be sharp up close but not so sharp when focused at a distance?

Dave


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gasrocks
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Feb 04, 2011 14:05 |  #22

Yes, some lenses can be different sharpnesses at different distances. Reason Canon suggest you use the right distance (the one you use most often) when doing a MFA.


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anthony11
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Feb 04, 2011 17:08 |  #23

gasrocks wrote in post #11777117 (external link)
Yes, some lenses can be different sharpnesses at different distances. Reason Canon suggest you use the right distance (the one you use most often) when doing a MFA.

One could argue that a $1275 prime that can't focus reasonably both near and far is majorly flawed.


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HKGuns
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Feb 04, 2011 19:41 |  #24

JonK wrote in post #11775351 (external link)
1/500 is too slow to get a high keep rate. Shoot it around 1/1600 - 1/2000. I couldnt shoot a 500mm f4 @ 1/640 or whatever without the IS on.

Bingo! You're experiencing camera shake, I guarantee it.




  
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alpharon
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Feb 04, 2011 20:04 |  #25

HKGuns wrote in post #11779112 (external link)
Bingo! You're experiencing camera shake, I guarantee it.

I have to agree with a lot of the responses here. I try to keep my shutter speed at 1/1000 or faster and bump up the ISO if necessary with this lens. I shoot with a 7D as well.


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KinoC
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Feb 04, 2011 20:42 |  #26

I was using the same lens (400mm/F5.6) this week and I notice that I could manual focus on subjects that where relative closed but if the subject was 200FT or more the captures didn't came out sharp. I was shooting at 1/5000 at ISO 800 on a 7D. I was able to see the eagle clear and it looked sharp but once I pressed the sutter it looked blurred. It looked like it was back focusing by 4 or more feet. However, if the AF was ON they came out clear. It was stange I even let someone else focus the lense to see if it was me.... same results (again on a tripod, no wind, sunny, temp 82 (South Florida Winter :) ). I did manual focus on at close distance (25FT) and they came out pretty sharp but on long distance with a tripod they were off. It is not my lens it belongs to my best friend. I still don't know if it is user error or a bad lens. It is new he just got it on December...


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Snydremark
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Feb 04, 2011 20:48 as a reply to  @ post 11775119 |  #27

Even with IS, I find that my best hand-held results come from the 100-400 @ 400 with shutter at LEAST 1/640. 1/400 and 1/500 don't get me great results unless I'm on a tripod.


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huntersdad
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Feb 04, 2011 21:37 as a reply to  @ Snydremark's post |  #28

My 400 had to be MA'd on my 7D. Around +5.

Another member taught me this: Tape a $5 to a wall. Get you lens as parallel to the wall as possible. You should be about 25 feet away. Focus point is the lower left hand corner of the bill. MA as usual. If you can't resolve the lines on Lincoln's forehead, you're too far away.

Worked well for me and made a big difference.


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weeatmice
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Mar 04, 2011 08:56 |  #29

Bumping this thread just to note that I have found similar with my 400 f5.6. At short distances it is very sharp, but at longer distances focus seems very slightly off. Tbh I never tried too hard fix it as close shots are better anyway, and as I use full frame I have to be closer. I will be borrowing a 7D soon so I'll see how that fairs.


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weeatmice
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Mar 04, 2011 08:57 |  #30

huntersdad wrote in post #11779694 (external link)
My 400 had to be MA'd on my 7D. Around +5.

Another member taught me this: Tape a $5 to a wall. Get you lens as parallel to the wall as possible. You should be about 25 feet away. Focus point is the lower left hand corner of the bill. MA as usual. If you can't resolve the lines on Lincoln's forehead, you're too far away.

Worked well for me and made a big difference.

I will be giving this a try but it will have to be a £5 and the dots on the queens nose instead :)


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Canon 400mm focus issues
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