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Sharpness All Of A Sudden Disappointing  
User currently offlinesingel09 From Netherlands, joined Jan 2005, 151 posts, RR: 0
Posted (1 year 5 months 2 weeks 6 days 13 hours ago) and read 3266 times:
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All,

I am frustrated. All of a sudden, my pictures are only half sharp.

Let me explain what I mean. When I shoot a 737 landing, the part after the engines is sharp, but all before the engine is not. I tried several shots today, no luck. Only half of the shot is sharp.

I monitored aperture, shuttter speed, iso , etc .... aperture 7.1 .. shutter 1/1000 .... ISO 100

Equipment canon 1D Mark II , 70-200 2.8 IS USM II

I had no issues before, hence this shot ..

http://www.airliners.net/photo/Nethe...d=f9b845ec43a193509ad18ed9822a25d2

Any of you have a possible solution to this? I guess I am doing something wrong, changed a setting by mistake, I don't know. Thanks for helping!!

Maurice

8 replies: All unread, jump to last
 
User currently offlineangad84 From India, joined Nov 2012, 1002 posts, RR: 3
Reply 1, posted (1 year 5 months 2 weeks 6 days 13 hours ago) and read 3264 times:

Misaligned lens perhaps?

Cheers
Angad


User currently offlinesingel09 From Netherlands, joined Jan 2005, 151 posts, RR: 0
Reply 2, posted (1 year 5 months 2 weeks 6 days 12 hours ago) and read 3242 times:
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Hi Angad

How can I check?

Cheers

Maurice


User currently offlineoly720man From United Kingdom, joined May 2004, 6848 posts, RR: 11
Reply 3, posted (1 year 5 months 2 weeks 6 days 12 hours ago) and read 3223 times:

If half the image is in focus and half isn't it may be that something has worn and got out of alignment, but you'd probably expect a gradual variation from one side of the image to the other, not a distinct variation

Some suggestions and things to do in the link.

http://www.canonrumors.com/tech-articles/how-to-test-a-lens/



wheat and dairy can screw up your brain
User currently offlineClickhappy From United States of America, joined Sep 2001, 9668 posts, RR: 68
Reply 4, posted (1 year 5 months 2 weeks 6 days 11 hours ago) and read 3217 times:
AIRLINERS.NET CREW
PHOTO SCREENER

Easiest way to test if you have a front focus or back focus issue is take three cans and stagger them, use a center point AF sensor with a stopped down aperture, f/8 or 11, and focus on the center can.

More details here:

http://www.fredmiranda.com/forum/topic/829303


User currently offlineckw From UK - England, joined Aug 2010, 769 posts, RR: 16
Reply 5, posted (1 year 5 months 2 weeks 5 days 23 hours ago) and read 3119 times:

Could be lens alignment or a problem with the is system.

Pin a newspaper on a wall, put the camera on a tripod at exactly 90 degrees to it and take some test shots at various aperture with is on and off. If the pics come out sharp across the frame, the lens alignment & IS are OK.

Front & back focus can be checked as per Royal's suggestion.

But, is this just one shot? Consistenty repeatable? It could also be as simple as a mis-selected AF point! I know that sounds obvious, but I've done it myself (more than once!).

Cheers,

Colin



Colin K. Work, Pixstel
User currently offlineviv From Ireland, joined May 2005, 3142 posts, RR: 28
Reply 6, posted (1 year 5 months 2 weeks 5 days 10 hours ago) and read 3058 times:

Quoting Clickhappy (Reply 4):
take three cans and stagger

If I took three cans of beer I would stagger ...



Nikon D700, Nikkor 80-400, Fuji X Pro 1, Fujinon 35 f/1.4, Fujinon 18 f/2
User currently offlineCaptainKramer From United Kingdom, joined Feb 2012, 226 posts, RR: 0
Reply 7, posted (1 year 5 months 2 weeks 5 days 7 hours ago) and read 3029 times:

I have had partial soft focus issues as you have described, with all my Canon lens I use from time to time, they include the Canon 100-400mm, Canon 70-200mm f4, although I have never had a problem with my Canon 200mm 2.8 prime lens.

If it does start to happen I switch the battery off, take the lens off and the then twist it back on as you normally do, lining up the red dots, it seems to reset things internally for some reason, and I don't normally have a problem after that.

Other times I have had an issue with soft focus, after it initially working fine, is when I am taking a shot of an aircraft on the long end of the lens and a tall truck or bus crosses in the foreground as I fire off a few shots, this can mess up the auto tracking focus system, same solution again, switch camera off take lens off, then twist it back on, problem solved.

I use a Canon 60D body, hope this helps.

[Edited 2013-07-11 17:20:33]

User currently offlineckw From UK - England, joined Aug 2010, 769 posts, RR: 16
Reply 8, posted (1 year 5 months 2 weeks 4 days 23 hours ago) and read 2989 times:

Quoting viv (Reply 6):
If I took three cans of beer I would stagger ...

But your pics will look so much better  

Cheers,

Colin



Colin K. Work, Pixstel
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