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Thread started 15 Dec 2014 (Monday) 20:05
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Wide open spots?

 
ppmax
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Dec 15, 2014 20:05 |  #1

Hi
Took some pics of some lights the other day and was shooting wide open. Found some weird specks...in my experience these types of things don't show up unless the lens is stopped down to f11 or so.

Any ideas?


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thx
PP

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GeoKras1989
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Post edited over 4 years ago by GeoKras1989.
     
Dec 15, 2014 20:30 |  #2
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Can you post the entire frame, please?

EDIT: May as well throw out my guess while I'm here. Since it is in all the bokeh circles (evident in the 2 red ones below and left of the bottom-center green), I am guessing internal lens (filter?) reflection.


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rrblint
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Dec 15, 2014 20:42 |  #3

Do you have a filter attached to the lens?


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ppmax
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Dec 15, 2014 21:16 |  #4

Thanks for the replies and insight. I'll post the full frame tomorrow as I'm not close to my desktop at the moment.

I didn't use any filters. This was wide open with the Roki 85mm.

Thx
PP


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Sdiver2489
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Dec 15, 2014 21:29 |  #5

It's either gotta be something pretty large on one of the back lenses....or its a defect in one of the lenses itself. My guess is the former.


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ppmax
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Dec 15, 2014 21:32 as a reply to  @ Sdiver2489's post |  #6

Thanks for the suggestion. I'll see what I can find.

Is this the kind of thing I'd be able to see with the naked eye?

PP


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Dec 15, 2014 21:52 |  #7

Must be a spot of dirt on one of the elements.


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ppmax
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Dec 15, 2014 21:59 |  #8

Had to run downstairs...visions of big chips gouged out of a lens element filling my head...

Well, I found the culprit. A big speck of something on the front of my lens. Lens boogers were the culprit.

Here's the full frame, resized to 1280 across.


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Thanks for all the suggestions!
PP

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Jim_T
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Post edited over 4 years ago by Jim_T.
     
Dec 16, 2014 07:45 |  #9

Looking at the first picture, it appears you have sensor dust. Dust on any of your lens elements could never be in such sharp focus.

Take a shot of something featureless (like the sky) at f/22 and see what you get. If it's sensor dust, it will be quite noticeable.




  
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snerd
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Dec 16, 2014 08:26 |  #10

Jim_T wrote in post #17335576 (external link)
Looking at the first picture, it appears you have sensor dust. Dust on any of your lens elements could never be in such sharp focus.

Take a shot of something featureless (like the sky) at f/22 and see what you get. If it's sensor dust, it will be quite noticeable.

Did you even read his reply from 10 hours earlier? He found the problem already.




  
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Harm
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Dec 16, 2014 08:34 |  #11

snerd wrote in post #17335632 (external link)
Did you even read his reply from 10 hours earlier? He found the problem already.

besides, the thought of it being on the sensor is totally wrong anyhow. dust on the sensor would make a spot/anomaly on one area of the photo. if you look carefully enough at the original image, there is a spot, in the SAME area on every single bokeh of light. That would mean there is something in/on the lens - since it is a consistent spot.

to the OP - glad you found it though...


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gonzogolf
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Dec 16, 2014 08:36 |  #12

Jim_T wrote in post #17335576 (external link)
Looking at the first picture, it appears you have sensor dust. Dust on any of your lens elements could never be in such sharp focus.

Take a shot of something featureless (like the sky) at f/22 and see what you get. If it's sensor dust, it will be quite noticeable.

Sensor dust wouldnt replicate in the same spot in each bokeh ball, that has to be a flaw in the optics. Sensor dust would create a single shadow wherever the dust blocked the sensor.




  
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Dec 16, 2014 16:29 |  #13

Good method for checking dust on lenses.... :) I found two specks en blew them off....


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Wolfie01SS
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Dec 16, 2014 16:47 |  #14

Today I learned how to spot the difference between sensor dust and lens boogers!

In all seriousness, I have had to clean my sensor in the past but have not noticed image quality issues from lens dirt. Now I know what to look for.




  
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Wide open spots?
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