Gear Talk > EOS Bodies - For Stills

Why do my photos not look sharp pic included....

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brad-man:
With a shutter speed of only 1/125 sec @400mm added to no remote shutter release...

mb66energy:
Do you have taken that photo on a hot day? If that is the fact, the unsharpness might
be an effect of atmospheric turbulence which affects a super tele much more than a standard
focal length - the 400mm are in fact 640mm!

Turbulence leads to a "patterned unsharpness" which I see in your photo. Nothing
is really sharp, some small areas seem a little bit sharper than others in the same
(focal) plane etc. The "wobbling" air can be observed on a sunny day, a well structured
non movable object (house) with live view ...

Try to use the lens under conditions where the temperature has been stable (+/-5 degree
centigrade) in the last several days and use objects which are not above water to
check what the lens delivers in terms of IQ.

If you use the Canon EF 5.6/400 L - I love that lens because of IQ potential but it's
me and hard physics which limits IQ in real world. In movies turbulence can add
very interesting effects, especially when used with the 400mm and the 3x digital zoom
of the T3i/600d (400 x 1.6 x 3 = 1920mm!).

Best - Michael

Kernuak:

--- Quote from: mb66energy on August 19, 2012, 01:39:35 AM ---Do you have taken that photo on a hot day? If that is the fact, the unsharpness might
be an effect of atmospheric turbulence which affects a super tele much more than a standard
focal length - the 400mm are in fact 640mm!

--- End quote ---
Actually, it's still 400mm whether you use it on crop or full frame, so the affects due to atmospheric conditions remain unchanged regardless of sensor. It's only effectively 640mm, due to the field of view, you'd get the same effect if you cropped to the same view on a full frame in post processing. However, with all that water, you are right about possible heat haze and moisture in the air causing sharpness problems. Due to the high pixel density of the 7D, it magnifies every problem.

bluenoser1993:
Shooting across water has given me problems as well.  The Tall Ships were leaving my home port at noon, unfortunately, on a very hot, sunny day.  The pictures taken across 2000 meter of water are shot with 70-200 2.8 II with 2xTC III on a 7D (effectively similar situation) and are soft with poor colour, but if you look closely it is not just poor focus.  The straight lines of city buildings in the back ground are actually wavy from the heat haze.  I have gotten very sharp images from this combination wide open, but even being stopped down this day did not help.  I attached an example that is cropped, but un-edited. 


Added:  Sorry, I would have just attached the whole image had I known it was going to down size the quality so much, but waviness is still visible along most of the straight edges, even at this resolution.

Wilmark:
You didnt say what lens you were using, are you using a teleconverter on a 200mm? Are you using any filters like an ND filter. How far away was the bird. was this pic cropped. Pics i have taken with the above combination give this kind of result especially if there is anything in the atmosphere. The pic of the herron is in focus. Its just a little hazed because of the distance between you and the subject.

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