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I use the Sony A7C with the Sigma Sony FE 24 70mm f/2.8 lens. The lens itself is clean from on the front and on the back and I don't see any dust on the camera sensor aswell. Do you have any ideas ?

I think the settings were something like ISO 250, F6, SS 200

PS: picture is cropped and zoomed in order to show better the small blurred area which are concerning me

enter image description here

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  • \$\begingroup\$ Make few more photos and check if you have the same dots on the same place \$\endgroup\$
    – Romeo Ninov
    Commented Jan 9 at 8:14
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    \$\begingroup\$ @RomeoNinov, it doesn't seem to appears on every photos from the session, I'll try to do some test at home \$\endgroup\$
    – JVDev
    Commented Jan 9 at 8:28
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    \$\begingroup\$ Looks like sensor dirt. More visible on clear pictures, with a closed diaphragm. Shoot at something very clear (clouds, white wall, or your PC display filled with white), with a very closed diaphragm (f/22 or more), with the camera out of focus. It should show up a the same place in multiple shots, even with different lenses. \$\endgroup\$
    – xenoid
    Commented Jan 9 at 9:26
  • \$\begingroup\$ @xenoid thank you a lot for the tip ! I'll try that, if this test conclude positive. Should I use a air pump (made for cleaning camera) in order to clean my sensor ? \$\endgroup\$
    – JVDev
    Commented Jan 9 at 10:27
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    \$\begingroup\$ Sensor dust is probably the first possibility, but spots on the rear element of your lens can also show up that way. Not so much with the front element, though.... \$\endgroup\$
    – twalberg
    Commented Jan 9 at 14:10

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Looks like sensor dirt.

This is more visible on clear pictures, with a closed diaphragm.

To check, shoot at something very clear (clouds, white wall, or your PC display filled with white), with a very closed diaphragm (f/22 or more), with the camera out of focus. Stains should show up at the same place in multiple shots, even with different lenses(*).

Very often a shot of air blower is enough.

Otherwise no need to panic if the sensor is a bit dirty, it won't show in most pictures, and is easy to fix in post production. When this becomes really annoying, then it's time to try your hand with a sensor cleaning kit or a visit to the service shop.

(*) The most efficient lens for this is a pinhole lens (very often DYI). Its equivalent f-number is close to 200 and this makes sensor dirt very visible.

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