Can you test lens by looking of pic: I just got a new lens, tamron 70 - 300 f/4 - 5.6 VC DI My question is when i looked thru it , it shows a very small wormlike particle. it is kind...

dblackard Loc: Rockport Texas

I just got a new lens, tamron 70 - 300 f/4 - 5.6 VC DI
My question is when i looked thru it , it shows a very small wormlike particle. it is kind of grey color. However i cannot see it in the pictures. Also as soon as i click the button , after it takes the picture there is a slight " jump" for lack of better term. i dont think it affects the pictures as it comes right after. Should i be concerned with this or is this normal. I did buy this lens used. I will include some test shots i took with it today to see if anyone can see anything i can not see. These were taken in regular sun, no post work done at all.

Erv Loc: Medina Ohio

Hi D! A better picture to test the lens would be to take one of a light blue sky without anything in it but sky. I don't think you will ever see it in your pictures. It takes a pretty good size piece of dust to show. This link isn't inside the lens but take a look. It is very interesting to see what will affect a lens. I would be more worried about fungus.
Erv
http://www.lensrentals.com/blog/2008/10/front-element-scratches

dblackard Loc: Rockport Texas

hey! i read all that and it is encouraging but Fungus????? what would that look like in a camera? ewww. and you think that is just a piece of dust in my lens?

Erv wrote:

Hi D! A better picture to test the lens would be to take one of a light blue sky without anything in it but sky. I don't think you will ever see it in your pictures. It takes a pretty good size piece of dust to show. This link isn't inside the lens but take a look. It is very interesting to see what will affect a lens. I would be more worried about fungus.
Erv
http://www.lensrentals.com/blog/2008/10/front-element-scratches

Erv Loc: Medina Ohio

All zoom lenses will get a little dust in them. It is the nature of the beast. Every time you zoom in and out it sucks air in and air out. Not a lot but enough to get some inside. I have lenses from back in the late 60's and see a bit of dust in them. But it never shows on the picture. I don't see anything in your picture. But take a shot of the sky and check. This is also a good way to check your sensor for dust too. It will get some on it at some point and will have to be cleaned. This happens from changing lenses.
Now fungus is a different thing. If the lens was not stored right and got damp, it will have little round fuzzy things on the glass. They start out small and grow bigger.
Did you look down the lens when it is off the camera at a light is the best way to look for dust or fungus. You have to hold your aperture open to do it though.
Erv

RocketScientist Loc: Littleton, Colorado

Can you get a picture of the lens defect itself? Post it if you have success.

Erv Loc: Medina Ohio

Hi D. This is dust on the sensor. Thought I had a better picture, but it is some where I can't find. :-D To many albums, but haven fun!
If you start to see these on your pictures, your sensor has to be cleaned. I am outside in all kinds of weather, dust and everything else and change lenses a lot. It is no big deal to clean your sensor. Just do a search on the site you will get a lot of help.
Erv
PS look at the big picture by hitting download

Dust on sensor

GoofyNewfie Loc: Kansas City

If you're seeing it through the viewfinder and it's not showing up in you photos (in a clear area like a plain sky) it's probably dust on your focusing screen.

dblackard Loc: Rockport Texas

yes, it is just on this new ( used ) lens i just got.

GoofyNewfie wrote:

If you're seeing it through the viewfinder and it's not showing up in you photos (in a clear area like a plain sky) it's probably dust on your focusing screen.

marcomarks Loc: Ft. Myers, FL

dblackard wrote:

I just got a new lens, tamron 70 - 300 f/4 - 5.6 V... (show quote)

Maybe something got on your mirror during the lens change and it's not in the lens at all...

ticTOC Loc: IL

Erv wrote:

Hi D. This is dust on the sensor. Thought I had a better picture, but it is some where I can't find. :-D To many albums, but haven fun!
If you start to see these on your pictures, your sensor has to be cleaned. I am outside in all kinds of weather, dust and everything else and change lenses a lot. It is no big deal to clean your sensor. Just do a search on the site you will get a lot of help.
Erv
PS look at the big picture by hitting download

Thanks Erv...... I got a good laugh out of the posting of the moon shot, just after it was suggested that taking a shot of a plain blue sky was suggested. (That's a picture of the moon not lense dust! That was what I laughed at).

Yes, after reading your 'PS' and following your download suggesstion, I was able to easily see the multipule "dried moisture spots".

You'll have to be more carefull when you open pressurized drinking liquid cans!
OR
This could also have been caused by the quick movement of the lense between temperature & humidity range change. An abrupt change like this could cause condensation. The spots that I see in your picture seem to have been dried up liquid spots. So the disruptive problem may not have happened the day that the moon shot was taken.

Erv Loc: Medina Ohio

ticTOC wrote:

quote=Erv Hi D. This is dust on the sensor. Thoug... (show quote)

Hi ticTOC
No this is what dust or dirt looks like on your sensor when it gets dirty. Nothing to do with liquid or condensation. I do a lot of lenses changing. I love to play with them all. And I shoot mostly in dusty areas I guess. Always have to clean the sensor. I try my best not too, but about every two months it happens.
Erv

ticTOC Loc: IL

Erv wrote:

quote=ticTOC quote=Erv Hi D. This is dust on the... (show quote)

Hi Erv
You'll know what it is/was because your doing the cleaning. My statement(s) were depending on what/how I saw it in the picture. The focus, the moon, was close to infinity, so the dust on the lense would be waaaayyy out of any possible focus.
Thanks ticTOC