Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: ApophisAstros on Nov 02, 2017, 14:36:39

Title: M106 NGC 4258
Post by: ApophisAstros on Nov 02, 2017, 14:36:39
Had this since imaging in July but not good enough to post, reorocessed with the latest PS CC, and improved it a bit.
(https://cdn.astrobin.com/thumbs/2c04df962cc2760ee0a5344e26cf4180.1824x0_q100_watermark_watermark_opacity-18_watermark_position-6_watermark_size-M_watermark_text-(c)Roger%20Nicholson.jpg) (http://www.astrobin.com/full/319871/0/?real=&mod=)
There were 3 large dust specks on it and processed them out nicely , interested if anyone can find where they were.
Roger

28 x 100 second subs
no darks or flats that i can find.
no bias

Title: Re: M106 NGC 4258
Post by: JohnP on Nov 02, 2017, 15:14:37
Definitely one 3 oclock position quarter way across from RHS about 1/2 way up... really stands out on my monitor...
Title: Re: M106 NGC 4258
Post by: Carole on Nov 02, 2017, 15:35:35
I suspect near the bottom on both left and right, but you did a good job removing them.  This is a difficult target to get the outer spiral arms even with a CCD camera, so for a DSLR and a beginner you've done very well.

Carole
Title: Re: M106 NGC 4258
Post by: ApophisAstros on Nov 02, 2017, 17:20:31
The three i removed were a triangle around the spiral.
Thanks Carole n John p.
Roger
Title: Re: M106 NGC 4258
Post by: MarkS on Nov 02, 2017, 17:44:24
You've captured faint spiral arms there!

It looks slightly out of focus to me - you need to nail that focus.

Mark
Title: Re: M106 NGC 4258
Post by: ApophisAstros on Nov 02, 2017, 18:00:25
Yes at the time i didn't have a bahtinov but do now and always focus on my alignment star.
Roger
Title: Re: M106 NGC 4258
Post by: JohnP on Nov 02, 2017, 20:28:39
Also Roger when I stretch it loads in PS you can see double horizontal lines dividing image into thirds - what caused this? Just curious - John