m13: a triplet

[alacant]

This was an interesting comparison. We had 3 reflectors this weekend; 750mm, 812mm and 1200mm. The same target with each. Not an easy project when you see Scorpio and Sagitarius up for grabs whilst you're still only half way through!

The aim was to try and keep everything the same. Looking at the colour, it's anything but:( Ah well...

Thanks for looking and clear skies to all.

-------

-------

 

Edited June 2, 2019 by alacant

[ollypenrice]

Your edit makes the post make more sense. When it was 150/812/1200mm I was wondering how you managed to get hold of two mirrors of such size! 

I think that the first one is the best processed but the last has the finest resolution. With more control of the brightest part of the curve it would surely be the winner. They are all impressive images with good separation between bluer and redder stars. For me the middle image has a green bias.

Olly

[alacant]

37 minutes ago, ollypenrice said:

green

Hi. Yeah. Should have kept one as a reference and used the same box to process the others. Tried the colour on my phone but nada. Gonna have a go side by side when I can get to a decent size screen. 

Edited June 2, 2019 by alacant

[ollypenrice]

10 hours ago, alacant said:

Hi. Yeah. Should have kept one as a reference and used the same box to process the others. Tried the colour on my phone but nada. Gonna have a go side by side when I can get to a decent size screen. 

I find it useful to measure various sample points in the background. My own preference is for parity per channel but some prefer more blue, some more red.

Olly

[alacant]

Tried with green but even the slightest touch gave it a mauve tint. This is with the red...

and a side by side with this one...

Edited June 3, 2019 by alacant