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Canon 7D +100-400 AF Problem  
User currently offlinetom3 From Luxembourg, joined Apr 2004, 240 posts, RR: 2
Posted (2 years 3 months 2 weeks 8 hours ago) and read 9502 times:

Hello

I've bought a 7D and now I have a few issues with some of my images , where some parts of the aircraft are out of focus/soft!

With my old 30D + 100-400 I had never such a problem.

Here is an example (unedited and downscaled to 1600x1067)

http://img5.fotos-hochladen.net/uploads/mycefc9gma7u1j8.jpg

The winglets and a part of the nose looks out of focus/soft , but the tail section looks right to me.

Hope to get some advice.

Thanks Tom


Tom Mousel - Lap
16 replies: All unread, jump to last
 
User currently offlineSilver1SWA From United States of America, joined Mar 2004, 4820 posts, RR: 26
Reply 1, posted (2 years 3 months 2 weeks 8 hours ago) and read 9495 times:
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First of all, it would help to see at full resolution.

Second, the shot looks soft throughout. And do you have examples under better conditions?



ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
User currently offlinetom3 From Luxembourg, joined Apr 2004, 240 posts, RR: 2
Reply 2, posted (2 years 3 months 2 weeks 7 hours ago) and read 9467 times:

Here is the original file

http://img585.imageshack.us/img585/8125/mycef1.jpg

Uploaded with ImageShack.us


And here is an image in better conditions

http://img341.imageshack.us/img341/520/lxpcv.jpg

Uploaded with ImageShack.us

Tom

[Edited 2012-06-19 18:29:41]


Tom Mousel - Lap
User currently offlineNZ107 From New Zealand, joined Jul 2005, 6433 posts, RR: 39
Reply 3, posted (2 years 3 months 2 weeks 6 hours ago) and read 9431 times:

Quoting tom3 (Reply 2):

Wow, that Cargolux shot really looks out. Is there some other factor, such as a filter, which could cause some distortions?

Is something dirty? Can you use other lenses on that body without any issues?



It's all about the destination AND the journey.
User currently offlinetom3 From Luxembourg, joined Apr 2004, 240 posts, RR: 2
Reply 4, posted (2 years 3 months 2 weeks 6 hours ago) and read 9419 times:

I have not used filters and there is no dirt , I have only tried with the 100-400. But also for me it looks quite strange since I had never such problems till now!

Tom



Tom Mousel - Lap
User currently offlineclickhappy From United States of America, joined Sep 2001, 9635 posts, RR: 68
Reply 5, posted (2 years 3 months 2 weeks 4 hours ago) and read 9398 times:
AIRLINERS.NET CREW
PHOTO SCREENER

The Cargolux shot is pretty blurry, but most likely due to it being 400mil at 1/400. But is that really ISO100? That grain is quite noticeable. That shot was also at f/7.1, have you tried stopping it down to f/8 or f/11?


The (I think?) Hawker is also long (370mm) and relatively slow (1/500). Again at f/7.1

What are your AF settings?


User currently offlinekukkudrill From Malta, joined Dec 2004, 1123 posts, RR: 4
Reply 6, posted (2 years 3 months 2 weeks 1 hour ago) and read 9372 times:

I'd hazard a guess and say that, aside from the grain, it looks like a lens problem. In both shots the trouble appears on the right hand side.


Make the most of the available light ... a lesson of photography that applies to life
User currently offlineNZ107 From New Zealand, joined Jul 2005, 6433 posts, RR: 39
Reply 7, posted (2 years 3 months 2 weeks 1 hour ago) and read 9366 times:

Quoting clickhappy (Reply 5):
The Cargolux shot is pretty blurry, but most likely due to it being 400mil at 1/400.

It shouldn't be that bad though.. Surely. Seems like a routine shooting session to me, something you expect to nail day in day out with similar settings.



It's all about the destination AND the journey.
User currently offlineSilver1SWA From United States of America, joined Mar 2004, 4820 posts, RR: 26
Reply 8, posted (2 years 3 months 1 week 6 days 22 hours ago) and read 9335 times:
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Something definitely isn't right with the Cargolux shot. It almost looks like a severe vibration effect. Did you have IS on or off? If on, try turning it off and see what happens.


ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
User currently offlinejpmagero From United States of America, joined Apr 2012, 173 posts, RR: 0
Reply 9, posted (2 years 3 months 1 week 6 days 22 hours ago) and read 9331 times:

I shoot with the same combination (7D + 100-400) and haven't had the focus issues you mention, but I do see that all my shots are very grainy, even at ISO100. Except in extremely bright light on a very bright surface, I *always* have grain in my images. It's not so much of an issue for printing through 13x19, but is noticeable on screen and for sites like this can cause issues (not that this is my only problem getting HQ photos on here). I've always attributed this to the 7D sensor, not the lens. Other IQ issues are my technique, I'm sure.

This sample 100% crop is not a HQ shot, but I don't have many samples on my work PC. Either way, you can see the extreme (IMO) grain present in the shadow and sky.


Shot at ISO100, 1/3200, f2.8 at 200mm



John M - Aussie expat in the US
User currently offlineSilver1SWA From United States of America, joined Mar 2004, 4820 posts, RR: 26
Reply 10, posted (2 years 3 months 1 week 6 days 20 hours ago) and read 9307 times:
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Quoting jpmagero (Reply 9):

The noise/grain at ISO 100-200 is a characteristic of the 7D. It's usually not a big issue and is easily managed with slight noise reduction in ACR or LR, but I will say I'm getting tired of the 7D image quality. Fantastic camera, but it suffers in the IQ department.

Back to the OP, I'm wondering if you have hada flawed lens this whole time but couldn't see the problem at the relatively small resolution of your 30D. At 18mp, the 7D shows any weakness in a lens.



ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
User currently offlineJakTrax From United Kingdom, joined Jun 2005, 4936 posts, RR: 7
Reply 11, posted (2 years 3 months 1 week 6 days 19 hours ago) and read 9286 times:

Quoting Silver1SWA (Reply 10):
Back to the OP, I'm wondering if you have hada flawed lens this whole time but couldn't see the problem at the relatively small resolution of your 30D. At 18mp, the 7D shows any weakness in a lens.

Exactly what I was about to say. I had a 28-105mm lens on my old 30D and it was fantastic, but once I put it on the 50D the softness at the frame edges was noticeable. My first 100-400 was terrible one side (I forget which - seem to recall the left), so I swapped it for another and that one was (and still is) fine. Had I coupled it with my 30D the issue may have been less obvious.

I have to be honest and say that, in addition, it appears that you are using the 100-400 in conditions that any lens would falter in. This time of year I keep mine in its box as atmospheric conditions are just too unreliable to guarantee great pictures. Both your example images seem to be at very long focal lengths, with mediocre/poor light, and insufficient shutters. The thing with this theory, of course, is that such limitations would have presented themselves way before now, with the old 30D.

I personally reckon it's a case of the first theory - the resolving power of the 7D revealing softness in the lens.

Karl


User currently offlineclickhappy From United States of America, joined Sep 2001, 9635 posts, RR: 68
Reply 12, posted (2 years 3 months 1 week 6 days 15 hours ago) and read 9236 times:
AIRLINERS.NET CREW
PHOTO SCREENER

John, not sure why you have shot that Falcon at f/2.8 and 1/3200!

User currently offlinejpmagero From United States of America, joined Apr 2012, 173 posts, RR: 0
Reply 13, posted (2 years 3 months 1 week 6 days 14 hours ago) and read 9227 times:

Quoting clickhappy (Reply 12):
John, not sure why you have shot that Falcon at f/2.8 and 1/3200!

I know...this was just a test shot to see how the shutter speed would affect heat haze and happened to be one of the only shots on my work laptop at ISO100 for the purposes of showing the noise I see.

[Edited 2012-06-20 11:19:42]


John M - Aussie expat in the US
User currently offlinetom3 From Luxembourg, joined Apr 2004, 240 posts, RR: 2
Reply 14, posted (2 years 3 months 1 week 6 days 14 hours ago) and read 9220 times:

Hello

I've took this photo today , what do you think about the edited result ?

For me it looks a bit better than the other shots I took recently!

http://img804.imageshack.us/img804/1327/b18720.jpg

Uploaded with ImageShack.us


Tom



Tom Mousel - Lap
User currently offlineKelvinCJ From United Kingdom, joined Mar 2012, 34 posts, RR: 0
Reply 15, posted (2 years 3 months 1 week 5 days 19 hours ago) and read 9132 times:

Just a thought here - but you mention you bought it recently. Any chance this could be a firmware issue?

I have read lots of online reports about similar issues and most were resolved by updating the firmware.

I know it is probably unlikely but just an idea. Having said that though I can only imagine said issue if you have an older stock version of the 7D as the update has been around for over a year now?

I think the edited image is better - as it should be! Unfortunately I cannot say anything specific as I am viewing on a smartphone but the general quality appears better than the others to my eyes.

Granted such an issue should affect the whole image but if you have older firmware it is worth a try.

[Edited 2012-06-21 06:45:35]

User currently offlinetom3 From Luxembourg, joined Apr 2004, 240 posts, RR: 2
Reply 16, posted (2 years 3 months 1 week 5 days 18 hours ago) and read 9108 times:

Hello Kelvin

When I bought the 7D , it had already the latest firmware version 1.2.5 , so I don't think it is a firmware issue.

Tom



Tom Mousel - Lap
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