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Messages - Zocky

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General / FWHMEccentricity maps
« on: 2015 May 06 14:51:38 »
I have a few more questions regarding those maps.

The maps show how your star sizes (FWHM) and shape (Eccentricity) varies over the FOV.  In a perfect world you'd have a consistent and small FWHM all over the field and lovely round stars everywhere, i.e. low Eccentricity - the SubframeSelector doc suggests that anything lower than 0.42 looks round.

It is clear that FWHM should be as small as possible, but what if you have a few very bright stars in your FOV. How does that affect on a overall FWHM?
If I understood correctly, ideal map would be the one that have just one grey tone with one numerical value. So the higher number of grey tones and the higher number of numerical values, represent poor image quality? What can be read from the position of the grey tone areas? Would be ideal map consist of concentric areas?
Here are maps from my Luminance image of M81/82. How does it look, good or bad?

Gallery / Re: Scorpius (constellation)
« on: 2015 May 06 14:20:05 »
Absolutely stunning image.

Script>Batch Processing>Subframe Selector
I thought that those maps are produced by Script/Image Analysis/FWHMEccentricity.
Could someone please give an explanation what those maps represent and how to interpret them? 

Gallery / Re: LBN782 - more dust
« on: 2015 May 04 13:48:01 »
Excellent image.

Image Processing Challenges / Re: Lagoon Trifid in RGB
« on: 2015 May 04 13:31:53 »
Nice image.
Can you provide equipment info?

General / Re: PI licence transfer
« on: 2015 April 28 12:39:05 »
OK, thnx for the clarification.

General / PI licence transfer
« on: 2015 April 28 02:18:22 »
I have a question about possibility to transfer PI licence to another person.
A friend of mine has sell all of the equipment and he wont practice astrophotography anymore. He would like to transfer his PI licence to another person. Is that possible and what is the procedure?


Fantastic images, rich in color and with plenty of details.

Gallery / Re: Second Image Carina Nebula
« on: 2015 April 27 01:23:44 »
How often does collimation have to be done on these scopes?
It depends how you use it. If your scope is stationary in observatory, than maybe once or twice per year. But if you move your scope for every observation, than you should check collimation more often.

Gallery / Re: Second Image Carina Nebula
« on: 2015 April 26 07:34:44 »
I have forgot to mention the collimation. If you want perfect image as possible, your Newtonian scope has to be proper collimated.
Here is video how to do that.

Gallery / Re: Second Image Carina Nebula
« on: 2015 April 26 05:15:11 »
Why are my stats around the image pointing inwards?
Because of a coma. This is an disadvantage of Newtonian scopes, but it is easily solved with coma corrector.
You can read about coma here, and this is coma corrector

Gallery / Re: Second Image Carina Nebula
« on: 2015 April 26 03:28:46 »
I think your data have more potential, that you have showed here. Image is a little bit over processed. It looks like your noise reduction was to aggressive. Did you use HDRMT? It looks so, and if so, you have applied it to much.
As I understand your scope is Newtonian type, so you don`t need field flatterer. Newtonian type scope need coma corrector. ISO800 feels right. You can play around with exposure times. Since you use LP filter, you can try longer exposures.

Gallery / Re: M33 - LRGBHa
« on: 2015 April 23 03:15:31 »
100% crop, the stars are not of good looking, not natural.
Yes, the stars are burned out. When you stretch the histogram try to mask the stars, or you can try Masked Stretch process. Also, there is noticeable chrominance noise. When combining L with RGB, via LRGBCombination tool, you have an option to control the chrominance noise.

Gallery / Re: Orion deep space, M42 & Horsehead nebula
« on: 2015 April 20 04:28:19 »
When you open PixInsight click on the Script/Utilities/NBRGBCombination.
In opened window select your RGB image and your NB files. For each NB file you have sliders, and with those sliders you can control amount of blending.

Gallery / Re: Orion deep space, M42 & Horsehead nebula
« on: 2015 April 18 12:08:37 »
Maybe if you try with NBRGBCombination script?

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