[dmurton (David)]

Originally Posted by MrB

Most of the modified camera's are using the Baader ACF or BCF filters(or none at all) which claim a 98% transmittance figure at Ha, which is also claimed by Baader to be 5x the trans of the standard Canon filter.
Canon claimed it's 20Da had 2.5x the trans over standard, and the 60Da has 3x the trans over standard.
I think that could be the cause of the very red images.

According to this graphic I found on the interweb, the Baader would have ~4x trans (98%) over standard(25%).
Would be interesting to see the curve for the 60Da's filter, guessing it would have approx 75% trans at Ha

75% seems to be the figure I came across when I was researching the camera, 3 times standard at 656nm.

Originally Posted by spacezebra

Battery is charged, setting the camera - love the twist screen, oh I need an SD card.

Cheers Petra d.

Hope you had more luck than I did last night, all cloud and rain.

Originally Posted by obsidianphotos

Hi David
Looking good for a first light. Well done Can't wait to see more images from these cameras. I would love to see someone do some landscape astrophotography with one one day so I can compare it to my standard 60D astrolandscape shots.
Cheers
Greg

I'm heading up north next weekend for a conference, I'll try and get some wide angle stuff done, and see how it turns out. I'll let you know.

Originally Posted by bmitchell82

I had a fully open Canon 40D and I never had a issue with too red. 99% of the time is colour balancing issues where peoples eyes or monitors are up the duff.

Here is a previous rendition of Eta carina and the 40D

Nice eta, puts mine to shame. I agree colour balance is a big issue, but wouldn't 'colour bleed' be an issue? For example, I was shooting the sun in H alpha, theoretically there should be little or no data in the green and blue channels. Red was not overexposed (was going for surface detail, not proms), there was a surprising amount of data in the green and blue channels. I'm thinking that with too much sensitivity in red, it might bleed over in to the other channels, washing out that data, meaning shorter exposures to compensate?

Originally Posted by Martin Pugh

Good colour!

well done
Martin

Thanks Martin, the colour hasn't been tweeked at all in PS or any other program, so I can't claim too much credit.

Originally Posted by dugnsuz

Nice start - have fun with your new camera David.
Just imagine 40x10minutes!!!
All the best
Doug

Thanks Doug. Imagine, 40x10 minutes - DROOL!!