Orion in H-alpna in a very wide field

[riklaunim]

More fun with DMK21 and a CS lens. This time Orion and friend in H-alpa (Astronomik). Orion 140 x 32 sec. Rosette 90 x 32 sec. It turned out good expet flashes from street lights in the bottom right corner. Gradient removing could help (raw stacks).

Orion

Rosette Nebula

[glennbech]

Hi,

Why do you get a gradient when you use a Ha filter? Are they "Broad-band" versions? Anyhow, interesting setup! If you could get tracking to work so you could do multi-minute sub frames, that setup would produce some stunning wide field images :-)

I gave the gradient removal in Pixinsight LE a shot :-)

[riklaunim]

Yo will get a gradient if a street light will be glowing directly on the lens And as it has insane FOV - it catches all the **** light from the ground. I shielded the lens with a tube, but it was bit to short to cut it all out.

And tracking isn't a problem. 144 arcsec/pixel isn't a problem for a HEQ5. Not that this is a f/2 CS industry lens so field curvature and everything else it's here

And Adam killed the gradient and made a mosaic:

[Doc]

You caught Bernard's Loop so pretty good.

[Dangerous-Dave]

That's great considering you used a DMK! Great detail of Barnard's loop. I must try this with the 6x7 lenses this winter.

[Rob_Jn]

Terrific Barnards loop, well done.

Rob