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Several of my holiday photo's had marks as this one has in top right corner. How do I remove dust etc for further pictures?
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They're dust spots on your sensor. You can clone them out in PhotoShop for these ones.
For future buy some sensor cleaning fluid and some swabs ... the process isn't quite as daunting as it sounds.
Be careful - sensor cleaning is not for the faint hearted. I only change lenses with great care, having the second lens in one hand ready to fit as I remove the other.
I wouldn't clean unless I really had to. These spots are easily cloned out, but sensor spots, unless very large, only show at tiny apertures and the bright sun probably meant f16 or f22. This is due to increased depth of focus (not field) at the lens rear at such apertures.
I have an artic butterfly brush - have had it 3 years and used it just twice, both on my 20D. Worked well and is very delicate. Wet swabs use mechanical action and are thus much more likely to cause marks or even scratches.
This shot is a bit bright overall, rather a lot of glare. late evening sun looks good but rarely photographs well.
as Paul S said above, this is caused by dust marks on the sensor. dosnt matter how careful you are they will appear over time if you change lenses. worst effect happens if you take a lens off when the camera is still switched on. then it looks like pebbledashing.
as the other Paul says dont feel duty bound to keep cleaning it off as its a delicate (but not too daunting) job and you need to do it in clean conditions with the right equipment. some use special swabs, some brushes and you can get like suction equipment and blowing equipment. just dont try and use household things that seem similar or appropriate because its rather easy to do serious damage to the sensor and filter. its not on the mirror its on the sensor behind it.
they are easy to lose in post processing if you have photoshop or elements. just select the clone tool, choose a soft brush and take a target from adjacent to the sploge with the same colour tone, cover the sploge and click, - gone forever.
its true the horizon is not level and in seascapes it really has to be. thats easy to correct too. couple of ways. one is to select all, edit, transform, rotate, then crop back square.
the other is to use the ruler tool, image, rotate, abitory done=crop back square.
the final thing here is the sun ball is so much brighter than the area in general from which the exposure has been taken and as such has burned out all the detail both in the sun and in the reflection. if you wait until the sun is just clipping the horizon, the brightness across the whole scene is more uniform and is easier to cature within the dynamic range of the sensor.
otherwise a nice scene in general well composed and exposed.
hope this helps
Unless you are completely happy doing it, don't touch your sensor. Really, if you change lenses with care and alwys have the camera switched off you will get few spots, but you will get some. The camera itself, as it wears, can generate internal dust.
Use wider apertures most of the time, best for composition anyway. Clone out spots if they show - will usually be in monotone areas like skies, which is the bottom of the sensor in the camera as the image is, of course, inverted.
My old 300D, bought just after they were introduced, never needed a clean - it had a few tiny spots, but rarely showed. (Now sold)The 20D has been cleaned twice with no damage and the later cameras not yet touched, although I have noted a spot on the 40D and that has sensor cleaning built in.
Never leave your camera body without a lens for more than a few seconds. Change lenses wherever possible indoors or out of the wind, and if you must clean, my advice would be a proper brush - if that fails - have it done professionally or by someone with a lot of confidence, but also skill.
It's up to you, but any kind of liquid or direct firm contact to the low pass filter on the sensor is asking for it!
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