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i have tried to clean my sensor mirror and lens as i have some marks on my images, after cleaning they are still there, after holding my lens up to my eye i can see what appears to be tiny sand grains and a tiny hair on the internal element of the lens but i cant seem to get rid of them using a blast of air etc,
these contaminating items are internal, i have been careful with lens caps etc but obviously not careful enough, how exspensive is it to have a lense professionaly cleaned ? its a sony alpha DT 18-55 Sam kit lens, is it worth it?
Are you sure its not on the sensor as specks of dust/sand etc inside the elements don't normally effect images. I've got a few specks inside my Sigma 70-300 APO and they've been there for years without any problems to images. I did contact Sigma at the time and they told me this.
Do they show using a different lens?
Ken
ps, have a look at this.
http://www.bobatkins.com/photography/technical/lens_condition.html
actually, on further inspection i have taken a few photos and the grians dont sem to affect the picture, but there are dark smudges ? i have since discovered the hair is somehow stuck in the view finder? but inside the camera, again cant remove them but dont affect the picture, and you are right the sand grains of which there are two dont seem to come out on the photo, i have cleaned the sensor but smudges and what appear to be water splashes , tiny ones remain, i will have to get a proper cleaning kit and try again,
...and no matter how careful you are, you can't avoid getting dirt inside your lenses. The changes in internal air volume as you zoom and focus mean that air is being sucked in and blown out all the time - carrying all manner of atmospheric debris with it. As RogBrown says, unless it gets really bad, it will not have much effect on your image quality.
Having had some lenses cleaned, colin beeley is right.
Quote: If there are flecks, hairs etc on the inside of your lens you will NOT see them in your pics.
It depends where they are. You can have a fairly large piece of dirt on the front element, and it won't be obvious in the image, though it will lower contrast below certain apertures (depends on where the dirt is). Dirt on the rear element may be more apparent. But otherwise, what LeftForum said.
great link rogbrown 
but you try & sell a lens with a mark on it !
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