Quick and Dirty Centaurus A

[SkyViking (Rolf)]

Originally Posted by Paul Haese

Rolf, yes the -38 from ambient is spot on. It is warm nights that are the killer. Temperatures of 26 degrees of a night time mean that -15C is possible but you need the water cooling to keep a good head room. In your neck of the woods it would be ok most of the time and you might even be able to achieve -20C on your warm nights.

Thanks for your reply Paul, that's what I thought. Looking forward to getting the QSI

[gregbradley]

Do you find it has much noise at -15C? I would have thought even at that "relatively warm temperature" it would still be fairly clean. I think you've been spoilt Paul. Some of my earlier cameras were a lot noisier than that.

Greg.

[Paul Haese]

I would say that there appears to be a relative increase in noise from -20 to -15C. I guess the noise really starts to become more noticable the more one stretches the data. Fainter objects will show the noise more given the same length of exposure as a brighter object. Yes I have probably been spoilt but I do note Greg that you are using a camera with -30C cooling now too. I have seen subs taken with an FLI and the noise comparison between -15 and -30 was appreciable. I am sure you wouldn't want to swap for a month?

[gregbradley]

LOL, yes I guess I am the one spoilt. I don't like it when I can't get -35C in the 16803 and have to settle for -30C! The Microline does -40 most times and -35 almost all the time. It is the zone for CCDs. Beyond -40 there is probably hardly any noticeable gain but -30 to -40 is pretty clean.

Still I am sure your QSI is still very clean compared to older CCD cameras around.

Greg.

[Paul Haese]

Originally Posted by gregbradley

Still I am sure your QSI is still very clean compared to older CCD cameras around.

Greg.

Without a doubt Greg. Still I am pushing harder and harder all the time now with this camera as I cannot really afford to upgrade.

[Cloudyagain (Neale)]

That's an excellent image for a quickie Paul. Mind you the DSLR image isn't real shabby either.

The detail in the dust lane of the QSI image is extraordinary. Do I detect some "Ken Crawford processing"?

Cheers

Neale.

[Paul Haese]

Originally Posted by Cloudyagain

Do I detect some "Ken Crawford processing"?

Cheers

Neale.

You know it mate. Just like I showed you at camp.

[Octane (Humayun)]

That is really nice, Paul. I so long for long focal length. Will have to wait many years before I can purchase something nice, I suspect. Bugger!

Excellent work. I don't mind the noise at all, to be honest. I try to look at things from an aesthetic point of view rather than technical. That's the artist in me!

H

[CoolhandJo (Paul)]

Very nice indeed! Colour detail FOV great!

[Paul Haese]

Thanks guys, appreciate the comments.

H, I know of a 8RC that will be coming up for sale soon with a proven track record. It will not be too expensive from what I understand. Might pay to keep an eye out.

[Leonardo70 (Leonardo Orazi)]

Magic Paul .... i like so much details and color ... i think with right integration you'll kep a reference one ...

Ciao,
Leo

[ballaratdragons (Ken)]

OK, so shoot me, but i much prefer the DSLR image.

To me the QSI image looks washed out and pale.
It certainly isn't a WOW! image.

Whereas the DSLR image has impact! Beautiful colour, depth, contrast, and it's a 'pretty' picture as well.
It IS a WOW! image.

That's how I see them