Rho Ophiuchi in 135mm (3 x firsts)

[CoolhandJo]

This represents a few firsts for me. First time used my HEq5 after belt modding it (cut my RMS error by almost 50%). First time imaged this target - used Samyang 135mm at F2.4. First time I didn't use a LP filter (I realized my east to Zenith targets sit in bortle 4!). This is 107 x 240sec RGB using ASI 533 MC pro with Svbony UV/IR (about 7 hours). I wasn't happy with the lack of Red in the image so I added 44 x 240 sec Ha (zwo 7nm) (about 3 hours). Processed in Pixinsight and Photoshop.

Astrobin https://astrob.in/byogc1/B/

[PKay]

Where on the same page Paul.

Lovely image :thumbsup:

[Nikolas]

Awesome capture mate

[multiweb]

Gorgeous fov Paul. One for the cool wall. :thumbsup::thumbsup::thumbsup:

[CoolhandJo]

Thanks Marc



Thanks Nikolas



Thanks PK

[AstroViking]

Beautiful. Absolutely beautiful.

[CoolhandJo]

Thanks. It's a nice target to view :thumbsup:

[Dave882]

Wonderful shot full of beautiful colour -and excellent framing too! Well done!!

[strongmanmike]

A fine looking well processed Rho there Paul, colours are lovely, very nice job :thumbsup:

Mike

[RyanJones]

One of the skies most beautiful regions. Lovely image 👍

[AdamJL]

Excellent work. I love the aperture diffraction spikes as well. Looks like you've got a very sharp version of that lens.
What did you use for autofocus? Or was it all manual?

[JA]

It looks wonderful Paul :thumbsup:
I've been itching to dig out a 135 for a similar job, when we eventually get to see the night sky:D

Best
JA

[CoolhandJo]

thanks JA - the 135 has a special place in my set up - but your right - need an excuse to drag it out as the FOV requires large targets.



Thanks Adam - yeah I know the Quality Control on these can sometimes mean they are not as sharp as others - I got lucky I guess. This is manual focus - using a B Mask at first run only - no intermediate check.



Thanks Ryan - I cant think of a region that has so much colour and dust in contrast like that TBH



Thanks mike !



Thanks Dave! I find the ASI AIR Pro dithers pretty good to keep most of it in the FOV so only have to crop edges.

[Retrograde]

Great work Paul. :thumbsup:

[CoolhandJo]

Thanks Pete

[gregbradley]

A superb Rho Paul. I think this is a good focal length for this object as its really quite broad.

I have that lens as well and yet to use it. I think that is a good use of it. This and the Orion complex.

Greg.

[Ryderscope]

That’s an excellent result Paul. Scanning through the image shows a nice flat field with great colours :thumbsup:

[CoolhandJo]

Thanks Greg - yes I do remember you mentioned having the same lens. The other good use is the super nova remnants regions

[CoolhandJo]

Thanks Rodney - I stopped the lens to 2.4 F ratio and I find it gives the best field.

[willik]

Beut image Paul well done.

[CoolhandJo]

Thanks :thumbsup:

[Shiraz]

cracking good image Paul.