M8 DSLR vs QHY

[graham.hobart (Graham stevens)]

Greetings, thought I would post same scope but different cameras. Namely Canon 60Da no cooling - Exif was 19'c even though ambient was 8''c. Exif dropped to 17'c after a while. Same scope and QHY 8 OSC. Same night. This has a TEC cooler but no control for cooling.
Air was 74% humidity. with a Moon heading towards it's last quarter..
I tried same objects but had to adjust for sensitivity.
Lagoon 60Da- Messier 8


and then QHY 8 OSC



oh and here is some grus Galaxies with the qhy

dslr was 3.4 hrs. QHY was about an hour between clouds.

[silv (Annette)]

Thank you for the comparison, Graham.

Why is the FOV sooo much smaller on the Canon chip?

[graham.hobart (Graham stevens)]

I think, from experience- it isn't, but I think I cropped more.
My own feeling was that the QHy 8 gave a 'warmer' vibrant sort of glow to the stars. They were post processed much the same. I have to say though- if someone comes up with a cooled DSLR mod that doesn't involve hours of tweaking (I have a shed corner dedicated to old TEC and heat sinks!), and doesn't weigh a ton- I am in.
Having said that, The QHY - I really like the colour representation so juries still out here.

[silv (Annette)]

in these adjusted images, judged from the color alone, I prefer the Canon version. because it is less yellow and the stars show their different tones better.
I'm a "winter color type" - yellow tint (summer type) doesn't suit me, makes me look pale. Maybe I have developed an aversion against yellow over the years. I prefer blue tints.

[gregbradley]

Originally Posted by graham.hobart

I think, from experience- it isn't, but I think I cropped more.
My own feeling was that the QHy 8 gave a 'warmer' vibrant sort of glow to the stars. They were post processed much the same. I have to say though- if someone comes up with a cooled DSLR mod that doesn't involve hours of tweaking (I have a shed corner dedicated to old TEC and heat sinks!), and doesn't weigh a ton- I am in.
Having said that, The QHY - I really like the colour representation so juries still out here.

There's an Orion cooling box that is not that expensive. It cools the whole camera and encases it. It sounds like a really bright idea.

Also you should use a power supply fake battery setup. Discharging batteries give off heat and will add to the temperature of the camera.

Greg.

[Ross G]

Nice photos Graham.

Yes, a cooled, current model DSLR would be the ideal all purpose astrocamera.

Good luck.

Ross.