A few images

avandonk · #1 02-10-2012, 02:22 AM

http://d1355990.i49.quadrahosting.com.au/2012_09/HH_NII_.jpg
http://d1355990.i49.quadrahosting.com.au/2012_09/M42_NII_.jpg
http://d1355990.i49.quadrahosting.com.au/2012_09/C+NB_LMC.jpg
http://d1355990.i49.quadrahosting.com.au/2012_09/SMC_mos_C+NB_10.jpg

http://d1355990.i49.quadrahosting.co..._09/HN_cr_.jpg

I am on top of all the variables i hope!

Bert

bartman (Bart) · #2 02-10-2012, 03:53 AM

Great captures there Bert!
Liking 1+2 the best.
Could you share some of the details of duration etc?
Cheers
Bartman

Rigel003 (Graeme) · #3 02-10-2012, 10:49 AM

Those super wide fields give a new perspective to familiar objects Bert. I've never seen so much of that swirling background nebula around the Orion showpieces. Well done. The first two are have a fair bit of noise though - maybe pushed a bit too far in processing?

Larryp (Laurie) · #4 02-10-2012, 11:12 AM

Love the wide field colour images

jjjnettie (Jeanette) · #5 02-10-2012, 11:59 AM

I'm totally gobsmacked Bert. I have to pick my jaw up off the ground.
Beautiful beautiful work.

RickS (Rick) · #6 02-10-2012, 12:29 PM

A fantastic FOV you have there and very deep images, Bert. Still some slight problems with tilt in the LMC and SMC images?

LewisM · #7 02-10-2012, 03:16 PM

I need to find a bar of soap, 'cause I swore when I saw that first image around Alnitak!

Humbling really... so many of us focus in on the "pretty" M42 region and try for the Horsehead, and yet there is so much faint glory all around it. Simply mind-blowing.

Regulus (Trevor) · #8 02-10-2012, 05:09 PM

These are wonderful images, thanks for sharing them.
Trevor

DavidU (Dave) · #9 02-10-2012, 07:55 PM

Love the wide super horsey !!! I have never seen it like that.

Paul Haese · #10 02-10-2012, 10:22 PM

Still issues with elongated stars present in all the images Bert. Like Ric said tilt etc, maybe flex too to some extent.

Potentially going to produce great shots. I particularly like the Orion image.

strongmanmike (Michael) · #11 03-10-2012, 12:27 PM

Great results Berto.

This is an F3 system and a huge 52mm diamter field, the degree of correction these images are showing is excellent, I would be very content with this as is. You could keep chasing your tail for absolute perfection ala those with PME's do with polar alignment

...but for what real gain?...or you could get out and image, image, image, the sky is your oyster now

Mike

gregbradley · #12 03-10-2012, 02:15 PM

Very good Bert. Its coming along nicely. That looks like a bit of tilt still as left side stars tend to elongated more than right side stars. A bit of packing needed there? Its probably also a very thin packer needed like .1mm.

Some of those narrowband backgrounds look black clipped giving a spotty look. Is that from processing or it needs longer exposure?

You are certainly picking up waves of Ha and other gases very well.

Greg.

dvj (John) · #13 03-10-2012, 02:56 PM

I did purchase one of these little scopes recently because you have proven it can be used with the Proline 16803 when care is applied to the image train.

avandonk · #14 04-10-2012, 01:51 PM

These are basically test images and are a sort of record as I eliminate or suppress all the bogeys of sensor alignment and focus, flexure, polar alignment and tracking.

I did decide a while ago to ignore current wisdom as it was full of misconceptions and fairy tales.

Imaging at F3 and with a field of 3.5 X 3.5 degrees is a very big ask for star image perfection. Just look at the central part of any image of this system and that is what most others attain albeit at F5 or F10, with nowhere near the speed!

I always show down to the noise because if it is not there you are throwing away data. It is a alot like airbrushing magazine models as it is not real!

This new system has tested my expertise and knowledge. One thing I have found it is difficult to differentiate rotation/drift from sensor alignment from one image. I have followed strict scientific procedure to change one variable at a time to establish the problem and then minimise it.

One solution to the star elongation problem is to only publish low resolution images where all the stars are blocky. That way the perfection of the image is affirmed by all!

Bert

Osirisra (Ken) · #15 04-10-2012, 02:03 PM

Even with the bugs, (who hasn't got some bugs) that horse head region shot is most epic!!!

allan gould · #16 04-10-2012, 02:11 PM

Well done Bert. I like the reasoning as you probably have heard it all before on what can go wrong with an imaging train. But as you say f3 with 3.5 degrees square is right at the edge and it all has to be right. The only way to get to the bottom of it is one step at a time and with care. M42 is my favourite.
Allan

Quote:

Originally Posted by avandonk

These are basically test images and are a sort of record as I eliminate or suppress all the bogeys of sensor alignment and focus, flexure, polar alignment and tracking.

I did decide a while ago to ignore current wisdom as it was full of misconceptions and fairy tales.

Imaging at F3 and with a field of 3.5 X 3.5 degrees is a very big ask for star image perfection. Just look at the central part of any image of this system and that is what most others attain albeit at F5 or F10, with nowhere near the speed!

I always show down to the noise because if it is not there you are throwing away data. It is a alot like airbrushing magazine models as it is not real!

This new system has tested my expertise and knowledge. One thing I have found it is difficult to differentiate rotation/drift from sensor alignment from one image. I have followed strict scientific procedure to change one variable at a time to establish the problem and then minimise it.

One solution to the star elongation problem is to only publish low resolution images where all the stars are blocky. That way the perfection of the image is affirmed by all!

Bert

avandonk · #17 04-10-2012, 02:58 PM

Quote:

Originally Posted by gregbradley

Very good Bert. Its coming along nicely. That looks like a bit of tilt still as left side stars tend to elongated more than right side stars. A bit of packing needed there? Its probably also a very thin packer needed like .1mm.

Some of those narrowband backgrounds look black clipped giving a spotty look. Is that from processing or it needs longer exposure?

You are certainly picking up waves of Ha and other gases very well.

Greg.

Greg. i do not need packing i just move the ITS on it's lateral dovetail. i need to move the current ITS setting a tad down and a tad to the left. As Mike said i could chase my own tail without an image to show for it!

I have now done a 64 minute exposure without any gross obvious movement.

here 6MB

http://d1355990.i49.quadrahosting.co..._64min_NII.jpg

This bit was easy as I had rotation with the SMC nearer the SCP. A careful T point realignment solved this.

It is difficult to optimise this system but the results are what make it worthwhile.

Bert

gregbradley · #18 04-10-2012, 07:25 PM

That's great you invented a frame for it. Nice work.

Greg.

Ross G · #19 06-10-2012, 07:18 PM

Great photos Bert.

Ross.

Stevec35 (Steve) · #20 07-10-2012, 03:39 PM

Although a bit noisy they are very impressive images Bert. Did notice a bit of left hand side star elongation but nothing I would worry about too much.

Cheers

Steve