Black dots in captures

perene

Why are all my captures like this?

http://i.imgur.com/6t5OC2q.jpg

I tried to clean the 90" diagonal, the ASI itself... but still those black dots are all over the captures.

When I cleaned the diagonal mirror a little some dark spots were not there anymore. But I bet this is a defect in the ASI camera itself.

I tried to clean the ASI using a specific tissue and Isopropyl alcohol as recommended by the store tutorial.

Is there a way to capture anything with a crystal image? No dark spots?

I am returning the camera to the store if this issue can't be fixed.

riklaunim

It can be on the sensor cover glass or on the camera cover glass - then dust blower should also help. To get to the sensor cover glass you have to unscrew the top of the camera.

It doesn't look like digital error.

Sam@ZWO

the dots are very clear

seems on the sensor

you need to open the camera and try to blow them away

you can find the procedure in the user manual

perene

The store recommended using isopropyl alcohol and a specific tissue. It helped, but now it seems the image has transparent stains.

Using a blower didn't help in my case. It seems the particle of dust was attached to the sensor.

riklaunim

ear buds are best I would say + the blower to blow out any cotton left on the surface :) You rub the sensor glass with the wet (alcohol) side, and then with the dry side and blow - no leftovers should be visible after that.

perene

This is the end result:

http://www.youtube.com/watch?v=stcy4q2qIZs

As you can see, the black dots (which the ASI manual says are from the sensor) are gone, except for one or two small, and the transparent stains came from the protector glass.

Source (check one of the three user manuals): http://zwoptical.com/Eng/Software/index.asp