M13 - Hercules Globular Cluster

[Tri Danimal]

Equipment:
Camera: Sony A7iii (DSLM)
Mount: Orion Sirius EQ-G
Lens: Sigma 150-600mm at 600mm f6.3
Filers: IRIX Light Pollution Filter

Capture: 31x2min exposures for a total of 60 minutes of exposure. No guiding.

Processing: DSS and Lightroom. Lightroom I made minor adjustments to shadows and highlights.

The light pollution filter made the image extra blue, I will continue to work on it throughout the next week.

[bambleweeney]

You only used a telephoto for this, well done. I've seen this through my telescope less plainly than this. Nice shot(s)

[rudi]

Hi Daniel,


A suggestion maybe: try next time also shorter exposures (iso 800; 45-60 sec). You will capture less faint stars, but you will capture more detail in the core without blowing it out.

Did you use darks and flats for calibration ?

….The light pollution filter made the image extra blue, I will continue to work on it throughout the next week.

You can balance the colors after the fact with "Levels". Click on the grey point eye dropper and then click on the background of the image and this will balance the colours.



HTH.

[Tri Danimal]

You only used a telephoto for this, well done. I've seen this through my telescope less plainly than this. Nice shot(s)

Yes and no!! I only had my DSLM and telephoto lens BUT both were placed on top of the Orion Sirius EQ-G mount. The Orion Sirius EQ-G mount is basically a star tracking tripod head. Its a lot beefier and it can support a 30 pound (13kg) imaging rig.

[Tri Danimal]

Hi Daniel,
A suggestion maybe: try next time also shorter exposures (iso 800; 45-60 sec). You will capture less faint stars, but you will capture more detail in the core without blowing it out.

Yes, I agree I need to shorten my exposure. I am thinking Ill will try 60sec and maybe try to capture 60 images (it will be the same amount of soak time.

Did you use darks and flats for calibration?

I use dark and bias files for calibration. I haven't figured out how to capture flats nor what they are used for.

You can balance the colors after the fact with "Levels". Click on the grey point eyedropper and then click on the background of the image and this will balance the colors.

I will have to try that tonight when I get home from work. I have not tried to mess with the "levels" stuff yet.

[Tri Danimal]

Upon further review of the image I was plesently excited to discover I also captured NGC 6207 a small faint galaxy, I have circled it for easy location.

[rudi]

….. I haven't figured out how to capture flats nor what they are used for…...

Proper Flats corrects for uneven field illumination (though NOT light pollution), vignetting, dust bunnies…
More details at: https://astrobackyard.com/how-to-take-flat-frames/

[Tri Danimal]

Proper Flats corrects for uneven field illumination (though NOT light pollution), vignetting, dust bunnies…
More details at: https://astrobackyard.com/how-to-take-flat-frames/

Prost, my friend.