NGC3729, NGC3718, Hickson 56 (Arp 322)

Im looking at those your image Dave right beside your reference image. Regarding the little cluster of 3-4 galaxies in the bottom right, underneath the arm of the main galaxy on the right. In your image they look to be slightly to the right of the core of the galaxy, if you draw a vertical line through the galaxy core, however in the reference image, if you draw the same vertical line, the little cluster looks like it would almost fall on that line or maby even slightly to the left of the core.

Is this difference due to:

1.The parallax as your image was taken from Dublin and the other image was taken from another part of the earth many miles away? With such distant objects would this even be a factor?

2.Is there a big time difference between when the two images were taken and the objects have moved( i know this is unlikely but i want to ask).

3.Is it to do with processing and editing of the images?

4. Something i have not thought of?

Are you kidding? Pretty close to the RC image Dave. I'd be over the moon with a shot like that :shock: If you want to pay another 20 grand for gear to put another 10% on the quality of your image......I'm amazed what you achieve with the set up you have. Inspirational.
I really have to give the astrophotography a go sometime :oops: .
Well done.

Is this difference due to:

1.The parallax as your image was taken from Dublin and the other image was taken from another part of the earth many miles away? With such distant objects would this even be a factor?

2.Is there a big time difference between when the two images were taken and the objects have moved( i know this is unlikely but i want to ask).

3.Is it to do with processing and editing of the images?

4. Something i have not thought of?

The images are just orientated slightly differently due to when and where the images are taken.

Dave, thats one cool capture. If you look at Rob's exposure time....12 hours, just take another 6 and a half hours luminance and I am sure you will be completely satisfied . I always use Rob's images jo gauge colour balance.

Dave you should adopt my method of astrophotog..............

..and that is??

Holding a digicam to the EP on the scope and cupping the two together with the palm of your hand.

So what you are saying Kieran is that it is nothing to do with parallax but its just the tilt of the object in the sky and thus the tilt of the image is different because of different location and say one image taken when the objects where rising towards the meridian and the other taken when the object was setting back down from the meridian. Kinda like Orion leaning to the left on the rise and leaning to the right when its setting. So if you looked early in the evening Rigel would be down and to the right of the belt whearas when orion is about to set and is thus leaning to the right from your point of view Rigel would be straight down from the belt.

Have I got that correct?