Marks on lens

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Bowsa

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Hi all,

I seem to have a mark on the images from one particular lens, its new and has been barely used. so if anyone is able to shed any light as to what this is it would be very much appreciate it :)
 
sorry cant seem to add my photo directly from the pc?

thought we used to be able to do that?
 
Bowsa said:
sorry cant seem to add my photo directly from the pc?

thought we used to be able to do that?
Click to expand...

You need to host the image on the internet, either on your gallery here, or Photobucket, Picassa, Image Shack or Flickr, then put the link in your post.

As i doubt that a mark on your lens element would show up on an image, I would suggest that it is more likely to be dust on the sensor, but I could be wrong.
 
Martyn... said:
You need to host the image on the internet, either on your gallery here, or Photobucket, Picassa, Image Shack or Flickr, then put the link in your post.

As i doubt that a mark on your lens element would show up on an image, I would suggest that it is more likely to be dust on the sensor, but I could be wrong.
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Almost certainly. No dust on or in the lens is visible as a mark on the image.

If it's sensor dust, it will only be really noticeable on areas of plain light tone, such as a sky, and only at high f/numbers.
 
I had a speck of dust on my sensor that only showed up occasionally, I thought it was on one of my lenses but upon examining the sensor, there it was, a quick light dab with a cotton bud ( not the best way I'm sure) removed it.
 
I'd agree with Martyn & Richard that's its almost certainly going to be dust on the sensor.
 
HoppyUK said:
Almost certainly. No dust on or in the lens is visible as a mark on the image.

If it's sensor dust, it will only be really noticeable on areas of plain light tone, such as a sky, and only at high f/numbers.
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Hi I am trying to do it through photobucket as I have an old account although that is not showing the file?
 
Bowsa said:
sorry cant seem to add my photo directly from the pc?

thought we used to be able to do that?
Click to expand...

Hi

If you go to the galleries section on here, choose my album, create an album and then click on upload photo. Point it to where you've saved the photo on your PC and it'll upload directly into your album.

Below the uploaded photo, you'll see a link, click and copy this, paste it into the thread and it'll show here.

Hope this helps ...
 
Bowsa said:
Hi I am trying to do it through photobucket as I have an old account although that is not showing the file?
Click to expand...

Just point the camera at a plain wall, on aperture priority, with a high f/number like f/16, and take a snap. Don't worry about any other settings, let the camera do that. If it's sensor dust, you'll see the mark.

Now do the same at say f/5.6, and you may still see it, but only just. Then try lowest f/number and it will disappear unless it something big. Then fit another lens if you have one - the mark/s will still be there.

Don't worry about it unless it spoils pictures. Most of the time it's unnoticeable, or many cameras have a dust removal option in the menus, or you can clone it out in post processing very easily.

All camera get some sensor dust, even if you never remove the lens, as air gets sucked in when you zoom. When it gets bad, clean the sensor - not hard, but another subject. Plenty of threads about that here.
 
HoppyUK said:
Just point the camera at a plain wall, on aperture priority, with a high f/number like f/16, and take a snap. Don't worry about any other settings, let the camera do that. If it's sensor dust, you'll see the mark.

Now do the same at say f/5.6, and you may still see it, but only just. Then try lowest f/number and it will disappear unless it something big. Then fit another lens if you have one - the mark/s will still be there.

Don't worry about it unless it spoils pictures. Most of the time it's unnoticeable, or many cameras have a dust removal option in the menus, or you can clone it out in post processing very easily.

All camera get some sensor dust, even if you never remove the lens, as air gets sucked in when you zoom. When it gets bad, clean the sensor - not hard, but another subject. Plenty of threads about that here.
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I am sorry that I didnt make this clear it is just with this one lens, and not any other? the pictures that is has ruined is at around F20.

Also the Sensor cleaner does not seem to work? to clear this?

thanks

mate
 
Bowsa said:
I am sorry that I didnt make this clear it is just with this one lens, and not any other? the pictures that is has ruined is at around F20.

Also the Sensor cleaner does not seem to work? to clear this?

thanks

mate
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It sounds as if your sensor needs a proper clean, the inbuilt sensor can only shift stuff that can be shaken off, anything that's stuck there will necessitate a wet clean.

To try and to put things into perspective with regard as to why it's not the the lens, have a look here - if that doesn't show up then you can guarantee a tiny speck of dust won't ether.....;)
 
Bowsa said:
I am sorry that I didnt make this clear it is just with this one lens, and not any other? the pictures that is has ruined is at around F20.

Also the Sensor cleaner does not seem to work? to clear this?

thanks

mate
Click to expand...

At f20 I am still more inclined to say it is the sensor, try the same lens at f2.8, f4, f8 and f16 against a plain wall or similar and look through the resulting images.

Also try with another lens also at f20 and see if it is there then.
 
Flash In The Pan said:
It sounds as if your sensor needs a proper clean, the inbuilt sensor can only shift stuff that can be shaken off, anything that's stuck there will necessitate a wet clean.

To try and to put things into perspective with regard as to why it's not the the lens, have a look here - if that doesn't show up then you can guarantee a tiny speck of dust won't ether.....;)
Click to expand...

i might be being silly but, photo's on another lens dont have any marks or anything on the photos taken on another lens. it is in the same place with the one lens every time.

i would have thought if it was on the sensor that the light section would show on both lenses?

thanks
 
Bowsa said:
i might be being silly but, photo's on another lens dont have any marks or anything on the photos taken on another lens. it is in the same place with the one lens every time.
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You stated the mark was visible at f20 on the "problem" lens, sensor marks show up more at smaller apertures, you may not have had the "clean" lens stopped down to such a small aperture.

The best way to rule this out is to use the "clean" lens at f16 or f20 and then compare.
 
Bowsa said:
i might be being silly but, photo's on another lens dont have any marks or anything on the photos taken on another lens. it is in the same place with the one lens every time.

i would have thought if it was on the sensor that the light section would show on both lenses?

thanks
Click to expand...

Dust spots are dark. If it's not that, then you're gonna have to post a pic.
 
Bowsa said:
i might be being silly but, photo's on another lens dont have any marks or anything on the photos taken on another lens. it is in the same place with the one lens every time.

i would have thought if it was on the sensor that the light section would show on both lenses?

thanks
Click to expand...

No, you're right it's a tiny mark on one lens :thumbs:

:bang::lol:
 
As photo bucket is messing about ATM can I email it to one of you guys to stick up please
 
Ok, got the pic. Couple of questions..
What lens is it
Does the lens in question have a filter on it?

Its most definately not sensor dust. Looks much more like lens flare or some crap on a filter causing reflections.

If the lens has a filter, take it off and try again, and also dont shoot at f/20 in a studio.. There is absolutely no need and its actually degrading your image quality significantly.
 
TCR4x4 said:
Ok, got the pic. Couple of questions..
What lens is it
Does the lens in question have a filter on it?

Its most definately not sensor dust. Looks much more like lens flare or some crap on a filter causing reflections.

If the lens has a filter, take it off and try again, and also dont shoot at f/20 in a studio.. There is absolutely no need and its actually degrading your image quality significantly.
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Hi the lens doesn't have a filter on it, and there isn't anything obvious I can see on the front, I have tried cleaning this with a lens pen several times without joy?
 
Bowsa said:
Hi the lens doesn't have a filter on it, and there isn't anything obvious I can see on the front, I have tried cleaning this with a lens pen several times without joy?
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In that case it must just be stray light from the studio lighting or flash. Does the lens still do it in every situation or just under flash lighting? What lens is it?
 
Obviously I can't comment on the pic but I'd question shooting at f/20!

You'll cause diffraction and softness. There's really no need to go above f/11 for total dof.
 
TCR4x4 said:
In that case it must just be stray light from the studio lighting or flash. Does the lens still do it in every situation or just under flash lighting? What lens is it?
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See I thought about this as well be the mark is in the place even though I move, the setup within the studio changed very little throughout that shoot. Now the lenses are stored with caps on the front and back so I don't know how anythin could have gotten into the back but is there anyway to check / remove this?
 
Can we see the pic then?
 
Here is the pic

I still reckon its some sort of flare, possibly due to the f/20 aperture, at the extreme end possibly fungus in the lens, but I dont think it would cause purple blobs like that.




DSC_5560 - Copy by TCR4x4, on Flickr
 
It's absolutely a flare spot! Coming off that extremely bright light on the left.

Sorry to say, but it's very badly lit. The background is far too bright, judging by the shoulder bleaching, something like 2-3 stops over - it should be 1/2 stop over, one stop max, and all areas of the background not in shot screened off to prevent flare, then a very efficient lens hood used.
 
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