Something quite different - Page 2

Bassnut (Fred) · #21 31-01-2009, 07:03 PM

OK, thats different, nice composition and colour on the neb part. Dunno about the halos tho.....

.

ummm, sorry, what was that.......Mike and the word "NarrowBand" in the same post

, nuh, cant be

.

strongmanmike (Michael) · #22 31-01-2009, 08:58 PM

Quote:

Originally Posted by Hagar

Very nice Mike. I love the little Nebula . Could almost be a baby Trifid Nebula.

Where do you get such obscure targets?

I thought the same thing and the interstella redening that appears to be affecting it has given it a lovely contrasting red/orange hue too.

I just surf around and look for info on areas, look at others work and get ideas, no rocket science there.

Thanks for you comments Doug

Quote:

Originally Posted by Bassnut

OK, thats different, nice composition and colour on the neb part. Dunno about the halos tho.....

.

ummm, sorry, what was that.......Mike and the word "NarrowBand" in the same post

, nuh, cant be

.

Fred ma man

Yes the small halos around teh bright stars seem a little more obvious on this target for some reason? Generally I don't find optical aberations like this objectional in astroimages though,as long as they aren't big and obvious, they are part of the equation in some form or another in every system. Hopefully the new ultra low reflection Astronomik filters will make a difference, particularly with the larger more diffuse halos I can get?

As for the narrow band capitulation..?..weeeeell I had to give in eventually huh?

besides, I could have used an OIII filter on this last target rather than the Ha as there was very little Ha in the filaments in this region, much more OIII.

Cheers

Mike

Peter Ward · #23 31-01-2009, 09:29 PM

Nice image Mike.

Some stars have the odd diagonal diffraction like spike running off them. I've seen similar, which proved to be a less than perfectly clean filter....maybe you are getting the same?

I would be interesting to see this field with much deeper data.

strongmanmike (Michael) · #24 31-01-2009, 09:54 PM

Quote:

Originally Posted by Peter Ward

Nice image Mike.

Some stars have the odd diagonal diffraction like spike running off them. I've seen similar, which proved to be a less than perfectly clean filter....maybe you are getting the same?

I would be interesting to see this field with much deeper data.

Ah yes, you might be right there Peter, I'll give them all a clean when inserting my new NB filters, hopefully next week?

Yes data and more data that is the quest....

You guys with observatories should really appreciate'em cause without'em mega data over multiple nights is veeeeery difficult, particularly with our shorter summer evenings

As I said I did do 2 hrs of Ha but with just 10min subs, F7.5 and the red insensitivity of the KAI11002 chip it was way too little - pretty faint stuff that. When I did the hand of God (CG4) last year which was also very faint in Ha I did some 8hrs worth of Ha data and that was still not enough really but I found it "was" useable in that case adding some 5hrs of Lum probably helped too though?

I did incorporate it in this potential Lum image but I wasn't happy with it when doing the LHaRGB combine so I left the Ha out in the end as it wasn't really adding anything to the bright Ha bits and just added under exposed noise to the rest of the field

http://www.pbase.com/strongmanmike20...73874/original

Thanks for your reply Peter

richardo (Rich) · #25 01-02-2009, 01:39 AM

Lovely image there Mike!
Love the composition getting a variety of objects.. certainly makes for interesting viewing. Something for every one!

Glad you had a couple of nights.
Just sometimes you can strike it lucky.

All the best
Rich

Garyh · #26 01-02-2009, 08:58 AM

Wonderful image Mike! Composition is just perfect!

I don`t know why some more parts of the Vela SNR arn`t imaged closeup?
Can find bugger all on the net except maybe some David Malin and Rob Gendler widefield shots? Nothing like you have done here but!
Verrrry nicee!
cheers Gary

RB (Andrew) · #27 01-02-2009, 11:10 AM

A beautiful vista there Mike, very nicely captured and composed (as always).

Now that deserves another Guinness !

strongmanmike (Michael) · #28 01-02-2009, 07:33 PM

Quote:

Originally Posted by richardo

Lovely image there Mike!
Love the composition getting a variety of objects.. certainly makes for interesting viewing. Something for every one!

Glad you had a couple of nights.
Just sometimes you can strike it lucky.

All the best
Rich

Yes struck it lucky but the whole rigmarole of packing the car getting out there setting up blah blah blah in an age where mega data is a must it all seems so...?...futile...

Quote:

Originally Posted by Garyh

Wonderful image Mike! Composition is just perfect!

I don`t know why some more parts of the Vela SNR arn`t imaged closeup?
Can find bugger all on the net except maybe some David Malin and Rob Gendler widefield shots? Nothing like you have done here but!
Verrrry nicee!
cheers Gary

Glad you enjoyed it Gary, comments like this help with the dispondency of not having an observatory to make imaging life a bit more atractive

Quote:

Originally Posted by RB

A beautiful vista there Mike, very nicely captured and composed (as always).

Now that deserves another Guinness !

Oh yeh now ya talking.. got no Guiness so I'll go get a Blue Tongue Lager

glenc (Glen) · #29 03-02-2009, 04:50 AM

Thanks Mike for a very interesting image. The red nebula on the left is Gum 20 = RCW 36. (Diam 12', RA 08 59 20, dec -43 44).
It is about 95' arc-min west of lambda Vel. http://galaxymap.org/cgi-bin/details...&name=RCW%2036

strongmanmike (Michael) · #30 03-02-2009, 06:50 AM

Quote:

Originally Posted by glenc

Thanks Mike for a very interesting image. The red nebula on the left is Gum 20 = RCW 36. (Diam 12', RA 08 59 20, dec -43 44).
It is about 95' arc-min west of lambda Vel. http://galaxymap.org/cgi-bin/details...&name=RCW%2036

Thanks a lot for that Glen!

That looks to be a useful resource?

Mike

jjjnettie (Jeanette) · #31 03-02-2009, 08:48 AM

There's something for everyone this one.
Beautiful work. Thanks for posting.

multiweb (Marc) · #32 03-02-2009, 11:45 AM

Truly exceptional image. Love the field colors and composition. As usual top work.

gregbradley · #33 03-02-2009, 04:52 PM

Just gorgeous Mike.

The neb on the left is one of the Gum nebulas. Not sure which one - there are 2 that are close to each other. You are not far from NGC2736 which is below that Gum nebula a small ways.

Ha in this region can be quite faint but its there in varying degrees in different parts of the area

Greg.

Geoff45 (Geoff) · #34 03-02-2009, 07:16 PM

Nice pic Mike. The halos may be coming from the filters, but at first glance they look a bit small for that. The other possibility is that they are reflections between the ccd cover plate and the entrance window. I noticed a similar halo around zeta ori in Peter Ward's Mr Ed post. This link to the Astrodon site makes interesting reading.
Geoff

strongmanmike (Michael) · #35 03-02-2009, 10:58 PM

Quote:

Originally Posted by jjjnettie

There's something for everyone this one.
Beautiful work. Thanks for posting.

Quote:

Originally Posted by multiweb

Truly exceptional image. Love the field colors and composition. As usual top work.

Thanks Jeanette and Marc your appreciation is..?.. appreciated

Quote:

Originally Posted by gregbradley

Just gorgeous Mike.

The neb on the left is one of the Gum nebulas. Not sure which one - there are 2 that are close to each other. You are not far from NGC2736 which is below that Gum nebula a small ways.

Ha in this region can be quite faint but its there in varying degrees in different parts of the area

Greg.

Thnaks Greg glad you like it mate, it's..?..well?..something a bit different anyway.

Yes Geoff directed me to some info on the nebula already.

I did 12 X 10min in Ha using a 12nm Astronomik too and it was very grainy and full of under exposure noise artifacts so it wasn't very useful.

Quote:

Originally Posted by ghsmith45

Nice pic Mike. The halos may be coming from the filters, but at first glance they look a bit small for that. The other possibility is that they are reflections between the ccd cover plate and the entrance window. I noticed a similar halo around zeta ori in Peter Ward's Mr Ed post. This link to the Astrodon site makes interesting reading.
Geoff

Yes I have read that before Geoff and it sounds right. Astronomiks have released a new range of low reflection narrow band filters and I will get them hopefully on Friday or early next week with a full LRGB set following as soon as they are available. This should reduce the larger halos I see around brighter stars but if it is indeed the cover slip causing the small halos close to stars then I'm not sure what I can do but live with em, besides they aren't objectionable in most images.

Mike

Ric · #36 03-02-2009, 11:02 PM

Top value Mike, I enjoyed the B&W image. I always find something special about them.

gregbradley · #37 04-02-2009, 12:11 AM

This should reduce the larger halos I see around brighter stars but if it is indeed the cover slip causing the small halos close to stars then I'm not sure what I can do but live with em, besides they aren't objectionable in most images.

Mike[/quote]

I think you are right Mike it probably is the filters and possibly they are reflecting back off of your flattener. The Apogee U16M has no cover slip and I see some reflections (not too many though) off the brighter stars sometimes that look similar to what you are getting.

You may also need to make a mask out of some black cardboard the same size of your chip and put it over the CCD window behind the shutter. That will most likely help as well. Blackening the edges of your filters with a black Texta also helps reduce stray reflections from the cut edges of the filters.

Greg.

Jules · #38 04-02-2009, 12:17 AM

Thanks for a great pic, Mike. I didn't know we had the equivalent of the Veil downunder.

It's certainly something different to try for!

BTW, I've seen pics from the 48" Schmidt at Palomar with HUGH halos... Nobody complains about those.

Julian

renormalised (Carl) · #39 04-02-2009, 12:24 AM

Quote:

BTW, I've seen pics from the 48" Schmidt at Palomar with HUGH halos... Nobody complains about those.

Done by professionals....that's how it's supposed to look!!

strongmanmike (Michael) · #40 04-02-2009, 12:38 AM

Quote:

Originally Posted by Jules

Thanks for a great pic, Mike. I didn't know we had the equivalent of the Veil downunder.

It's certainly something different to try for!

BTW, I've seen pics from the 48" Schmidt at Palomar with HUGH halos... Nobody complains about those.

Julian

Thanks Julian

The Vela SNR, while perhaps over all a bit fainter than the Veil, is much more extensive and interesting as it sits in a dense molecular cloud region that spans a lot of the sky in Vela that is full of interesting colourful nebulous features and stars.

Yes the Canada France Hawaii telescope shows very strong halos too, I think from the Wynn corrector..?

Mike