Dots on DSLR

[Kenboy]

Hello,

I've just bought a 2nd hand Canon 550d + 50mm F1.8 lens 

On taking a long exposure picture with the lens lid on - i notice widespread and multiple small red and blue dots, some even white dots 

I've also noticed some of these fixed dots on live view finder when I'm following a star on 10x zoom 

Are these just hot pixels? and are they normal to have?

haven't taken any astropics yet - but would'nt this affect all my pics (especially when I add on a refractor scope later on)

 

thanks! 

[wxsatuser]

You will find lots of hot, dead and stuck pixels, imo normal.

You should be able to fix most by doing a manual sensor clean.

Make sure the camera has reached ambient temperature and switch to manual or bulb mode.

Find menu item sensor clean do clean now.
This will update the bad pixel map and should remove these pixels, remember to only shoot RAW
as jpegs will not be updated.

When you add a telescope you will no doubt stack multiple images, this will normally get rid of bad pixels
during the stacking process.

Edited June 21, 2020 by wxsatuser

[Kenboy]

awesome thanks  

[richard ashbee]

this might explain what has happened

https://photographylife.com/dead-vs-stuck-vs-hot-pixels

[CloudMagnet]

Yep, completely normal for any camera. When you come to process astro photos, you should also take "dark" frames. These are pictures taken with the lens cap on at the same exposure length and ISO setting as your normal pictures. Stacking software will use these to help subtract hot pixels from your final image.