Eta C region Ha widefield

[RobF (Rob)]

I've been meaning to shoot more widefield Ha, so full moon was a chance to dig out my 100mm Pentax and put it on the QHY9. This all sat on my new guidescope rig (FSQ106 + Starshoot autoguider )

Its a lovely sharp manual lens to play with on my Canon 450D, and I'm pleased with the detail that came through in this.
Larger version here

7 x 20mins unbinned, Baader 7nm Ha

[Larryp (Laurie)]

Nice image, Rob!

[troypiggo (Troy)]

I'll swap my finder guider for your guide scope

Lovely wide field mate.

[jjjnettie (Jeanette)]

Originally Posted by troypiggo

I'll swap my finder guider for your guide scope

Lovely wide field mate.

ha ha, beat me to it.

Awesome stuff.

[RobF (Rob)]

Thanks for looking everyone.

This FOV is just over double the height/width (4 times the area) of a 16803 chip on the Tak (day dreaming ). Seemed silly not to be shooting through it but really wanted to see the wider vista this time around.

[multiweb (Marc)]

Cool shot Rob. Very familiar field.

[jase (Jason)]

Rob, Great work! Impressive field of view. What is the sampling with this set up? It looks a tad soft yet still captivating (perhaps focus, sampling or processing related). Would be good to revisit the area with the FSQ as a comparison. Colour data when the moon goes down perhaps? What you could try is capture RGB using the 100mm lens and match it to the FSQ luminance. Resizing data is a good way of getting improved resolution too. For this field for example, you could resize the FSQ lum to give greater resolution to the 100mm FOV. That way you get a pleasing FOV and resolution where it counts. Plenty of options to experiment with.

[RobF (Rob)]

Originally Posted by multiweb

Cool shot Rob. Very familiar field.

Thank you, o widefield King!

Originally Posted by jase

Rob, Great work! Impressive field of view. What is the sampling with this set up? It looks a tad soft yet still captivating (perhaps focus, sampling or processing related). Would be good to revisit the area with the FSQ as a comparison. Colour data when the moon goes down perhaps? What you could try is capture RGB using the 100mm lens and match it to the FSQ luminance. Resizing data is a good way of getting improved resolution too. For this field for example, you could resize the FSQ lum to give greater resolution to the 100mm FOV. That way you get a pleasing FOV and resolution where it counts. Plenty of options to experiment with.

Thanks Jase. It works out to about 10 arsec/px even with the QHY9s small 5.4 um pixels. The processing was a bit lazy to be honest - I wasn't expecting anyone to zoom in too much so the keyhole area is blown. I've attached a zoom jpg which is pretty representative of what the master looks like with more considerate stretching right up close. Ok for a 1970s lens? Hmm, actually the tracking isn't anything to write home about zoomed in that far.....

[peter_4059 (Peter)]

Good stuff Rob.

[pvelez (Pete)]

Originally Posted by RobF

Hmm, actually the tracking isn't anything to write home about zoomed in that far.....

I wouldn't be troubled by that Rob - looks quite sharp for such a lens to me. Great job

As Jase suggested, you can have a lot of fun with that data with some RGB

Pete

[RobF (Rob)]

Originally Posted by peter_4059

Good stuff Rob.

Thanks Peter. Was hoping to get a bit more even wider stuff shot last night but weather wasn't agreeable

Originally Posted by pvelez

I wouldn't be troubled by that Rob - looks quite sharp for such a lens to me. Great job

As Jase suggested, you can have a lot of fun with that data with some RGB

Pete

Yes Pete, I should really experiment with resampling - would be a good learning exercise if nothing else. Same with RGB. Another thought I'd had was using the DSLR to get some no-nonsense lower res colour data. The only downside is it does take a while to reconfigure everything, get focused, etc, etc.

[Ross G]

Great looking wide photo Rob.

Detailed and sharp.

I love the composition.


Ross.