Am I loosing data?

[Calzune]

Hi!

Right now Im shooting M81 with my modified canon eos 1100D.

Im currently trying different exposure settings and i need help.

this is ISO 1600 x 300sec

Do I loose data at that exposure? (overexposure)

or should I go with 200 or even lower?

 

 

 

 

Edited January 19, 2020 by Calzune

[wimvb]

The first image has the histogram a bit high. It looks like you have a very high level of light pollution, which adds to the signal. Try lowering iso to 800 or even 400. I guess that the second image shows the histogram for the region inside the ellipse? If so, it's over exposed. Again, lower iso or exposure time (90 - 150 s). Also consider using a light pollution filter. 

[Calzune]

I use ISO 1600 because that's the best ISO for my camera. 

I went for ISO 1600 x 200sec, I'll edit the image today and post it here. 

The only light pollution filter I have is a optolong L-eNhance Dual Narrow band, and that's only for nebulas right? 

[wimvb]

1 hour ago, Calzune said:

The only light pollution filter I have is a optolong L-eNhance Dual Narrow band, and that's only for nebulas right? 

I think so. 

1 hour ago, Calzune said:

I'll edit the image today and post it here. 

👍

[gorann]

If ISO 1600 is optimal for your camera (the same with my Canon 60D) then reducing exposure time would be the way to go next time.