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Topics - Zocky

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Gallery / Dark shark nebula
« on: 2016 September 11 14:35:53 »
Molecular cloud in Cepheus, containing objects LDN 1235, VdB 150, VdB149 and galaxy PGC67671.
Comments are welcome.

LDN 1235 - Dark shark nebula by Zoran Novak, on Flickr

Gallery / VdB 152
« on: 2016 September 11 14:32:40 »
Hi all.
I wasn't active on forum lately, but I am back :)  Here is one of my two recent images.
Comments are welcome.

Vdb-152 by Zoran Novak, on Flickr

Gallery / Bubble nebula - widefield
« on: 2015 August 10 15:23:19 »
Widefield image of open cluster M52 and NGC7635 - Bubble nebula.

M52 and NGC7635 by Zoran Novak, on Flickr

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?

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?


Off-topic / Simple AstroTools
« on: 2015 February 14 06:41:42 »
A must-have app for every astronomer.
App is excellent. You can calculate FOV, find an object for imaging etc....

Gallery / Comet Lovejoy C/2014 Q2
« on: 2015 January 11 15:25:00 »
Finally I have managed to put my hands on this comet :)
I followed Harry`s tutorial, how to put a comet on a non trailed star field. It turn out quite OK.

Comet C2014-Q2 Lovejoy by zocky40, on Flickr

General / PixelMath 50:50 blending
« on: 2014 December 09 11:58:46 »
Which expression should be used in PixelMath, for combining L and Ha image in 50:50 blending mode?


General / Which rejection algorithm to use
« on: 2014 November 29 10:14:28 »
If I understood correctly, Rejection algorithm is chosen based on number of images for integration.
Can someone please elaborate more precisely, correlation between number of images and algorithm, and which one to choose? 


Gallery / IC 434
« on: 2014 November 08 17:03:44 »
Winter sky objects are slowly rising :)
This shot of Horsehead was taken on early morning just before sunrise. Unfortunately the sky was hazy and due to that image is not as detailed as it should be.
Image acquired with Skywatcher ED80 and SBIG ST8300m.
Exposure: L 5x10 min.; RGB 5x5 min. (bin 2x2); Ha 5x15 min.

IC 434 by zocky40, on Flickr

Gallery / M 31 - Andromeda
« on: 2014 November 08 16:49:33 »
Andromeda galaxy, probably one of the most photographed objects :)
Image acquired with Skywatcher ED80 and SBIG ST8300m.
Exposure: L 5x15 min.; RGB 5x2 min. (bin 2x2)

M31 by zocky40, on Flickr

Gallery / M 13 wide field
« on: 2014 November 08 16:43:08 »
M 13 - Globular cluster in Hercules
Image acquired with Skywatcher ED80 and SBIG ST8300m. Exposure: RGB 6x5 min.

M 13 - Globular cluster in Hercules by zocky40, on Flickr

Gallery / M 101 - widefield
« on: 2014 April 05 14:15:39 »
Here is wide field view on M 101. The field of view is filled with small galaxies. Link to Hi-res.
Total exposure time is 240 min.

General / Background intensity values
« on: 2014 January 07 12:17:25 »
Hi all!

Can someone help me to understand this values?
Back in Photoshop black had intensity 0, white 255, and I was aiming to have my background around 25 to 30. 
In PI those values are represented with numbers 0,000 to 1, is that correct? So for what value I have to aim for ideal background, and how are this numbers correlated to those in PS?

Workshops and Conferences / Terms and conditions for workshops
« on: 2013 December 28 15:01:18 »

I would like to know what a the terms and conditions for workshops?
For instance, what would it take to have a workshop in Croatia?


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