White Dots on photos. - DPChallenge Forums

Sony 24-70mm F4 Vario-Tessar T* FE OSS

12/29/2013 03:37:51 PM · #1

We just bought a Pentax K-500 camera. Some of the photos have white dots on them, they are not sun flares. Many people have said that they were dust particles from the flash. Some of the photos were taken during the day w/o a flash. You can only notice them when the photo is blown up to 100% I've read where some people with other cameras had the same problem. It seems to show up on photos with snow or water. Does anyone have a logical answer to this problem & can it be fixed? Never had this problem with Sony, Canon, or Panasonic.
Thanks in advance.
Linda

Bear_Music

Samsung Galaxy S24 Ultra

12/29/2013 03:50:44 PM · #2

We need to see a blowup of the problem: can you post on flickr or something and link? And, BTW, welcome back, LOL... Been over 10 years!

Voigtlander Ultron 35mm f/1.7 Aspherical MF Wide Angle - Black

12/29/2013 04:07:22 PM · #3

Thank you for the welcome back. I\\\'m not much of a poster, except on F/B. This isn\'t one of our photos but a good example. You need to enlarge to 100%. I can't put a link to the photo. (Sorry) It's just tiny little white dots.

In order to prevent spam, new users of our forums are unable to post URLs.

Please remove the URLs from your post and try again.

Paul

Leica SL

12/29/2013 04:10:05 PM · #4

Originally posted by Linda:

In order to prevent spam, new users of our forums are unable to post URLs.

Please remove the URLs from your post and try again.

Goodness, if 11 years isn't long enough to not be classified as a new user...

Nikon AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6 ED

12/29/2013 04:14:55 PM · #5

I'll see if I can get my husband to post the image. It is on his computer.
We'll get the photos posted tomorrow, sorry for the delay.

Message edited by author 2013-12-29 16:41:06.

Apple iPhone 5

12/29/2013 07:49:17 PM · #6

They probably base 'new user' on number of forum posts. Less than 10 (or something) probably counts as 'new'

nam

Sony DSLR-A580

Sony DT 18-70mm f/3.5-5.6 Aspherical ED Zoom Lens for Sony Alpha

12/29/2013 09:38:51 PM · #7

hot pixels? Maybe do a search on that and see what you think.

12/30/2013 03:17:10 PM · #8

Thanks for all this. This is not a hot pixel problem, we do have one on this new sensor (red one) which is usually the case. This is white dots in a lot of different situations. Normal daytime shots are not effected, if there is no snow or no water. So I prepared 4 different shots for you with sections that are 100% crops of the original inserted. The water photo was in a review with no attached or written copyright. So I\'m just presenting a portion of it here to show the dots.

I COULD NOT POST THE LINKS TO THE PICTURES, I HAVE THEM ON OUR SERVER FOR OUR WEB SITE. I USED THE INSERT IMAGE BUTTON ABOVE?

This is almost the same as the problem Fuji had with one of their camera models, only the dots here are not as large. Now as long as we\'ve been photographing all kinds of landscapes, old buildings, animals and more for our web site we\'ve never seen this with our Nikon\'s, Canon\'s, Sony\'s or our Micro 4/3\'s The output from this camera (Pentax K-500) with a 16 megapixel CMOS sensor and Pentax lenses is sharp as anything I\'ve ever seen, even for a full frame, with good color rendition. This is not shown in the above photos being mostly night shots. It has a great high ISO output also. But these dots worry me. Anybody know what this is?

Google Glass Google Glass

12/30/2013 03:18:28 PM · #9

Maybe one of you could post them for me. You can email me at don@in-the-desert.com I'll send you the links to the 4 photos.

Don....

ambaker

Canon EF 70-200mm f/2.8L USM

12/30/2013 04:27:14 PM · #10

email sent...

ambaker

Google Glass Google Glass

Canon EF 70-200mm f/2.8L USM

12/30/2013 05:36:58 PM · #11

Here are the links to the images under discussion.

Image #1

Image #2

Image #3

Image #4

Cory

Canon EOS-1D Mark IV

Canon EF 85mm f/1.2L II USM

12/30/2013 05:53:15 PM · #12

Ok!

No need to worry, this is an effect called 'specular reflection'

Essentially, the little ice flakes are shaped like plates, and are reflective - so whenever you photograph them (especially with flash) you will see the ones that are angled correctly reflecting the light towards you, and as such they will appear extremely bright.

Ever notice how the snow 'sparkles' when you're walking around looking at it? Same thing, but since you're moving they appear and disappear rapidly.

Funny enough, this is a great technique to spot hunting spiders at night - their eyes are really reflective as well, so you'll be able to spot them by simply using an on-axis flash at night and shooting pictures of empty fields..

In short, this is normal, and you have absolutely nothing to worry about, all is fine and well.

Message edited by author 2013-12-30 17:54:52.

ambaker

Google Glass Google Glass

Canon EF 70-200mm f/2.8L USM

12/30/2013 06:30:59 PM · #13

I agree with Cory. I've seen snow do this before. The water could be sparkles off the water. I did notice there were no white dots in other than the reflective areas, so I doubt it is a sensor issue.