New Tutorial: M27. Revealing external faint halo

[Nocturnal]

Yes, using an OAG will allow you to eliminate DF or at least reduce it to very low levels. Of course the Law of Preservation of Misery dictates that you're merely swapping one set of problems for another. Guiding with an OAG is considerably harder and more restrictive than using a guide scope.

[Niall Saunders]

Hi Sander,

Having had no experience of using an OAG, can you clarify "considerably harder" and "more restrictive"?

I was seriously toying with the TS OAG-9, and am trying to wade my way through the choice of 8300-based cameras to choose from as well (my 'current' 8300-based camera isn't that great, and it might yet be heading back onto eBay to see if I can recover the $500 I paid for it).

I have just worked my way through the long thread on CN, where both you and Harry posted, where the thread initially addressed the Orion AO unit, but went on to discuss the new 8300-based CCDs that were coming down the line.

Decisions, decisions,

Cheers,

[Nocturnal]

Hi Niall,

you'll find this is a controversial topic depending on where it gets discussed. Try asking about this in the autoguiding Y! group

- you have a smaller field of view and because you're looking at the edges of your field of view you can have more distorted star shapes than a guide scope would present. I ran into this with my C11.
- Getting both the imaging and guide cam to focus at the same time can be challenging depending on the OAG model.
- longer FL numbers mean the field of view of your guide cam is small and less light per star hits it. So you are restricted in two ways:
   - fewer stars to choose from
   - dimmer stars
  both these restrictions mean you may have to rotate your camera to make sure you get a bright enough star on your guide cam. The guide star dictates image framing in that case. Not desirable.

Image train gets more complicated and you may run out of backfocus space. Or the spacing between flattener and sensor is compromised.

Anyway, it all depends on needs and wants. I can get away without an OAG right now. If I have to I would use an OAG but not for fun, only because it's the only available option to get the image quality I desire.

[Harry page]

Hi

I always use a OA guider as my big old newt bends a lot  

Personally I have no problem at all using my SX OA , I just shove it on and never have to hunt for a guide star  8)

But very key to this is my use of the Loadstar guider which is very sensitive and it is more difficult with a less sensitive guider , I also have a sxv guide head which

I have tried with the OA unit and this is not so successful as you may need to hunt for guide stars, I highly  recommend a good guide camera , makes life so much easier

You will have to us know which 8300 camera you choose

Harry

[Niall Saunders]

Hi Harry,

Right now I am seriously thinking about the Atik 383L+ - because it is fundamentally price in UKGB£, there is already a HUGE price advantage compared to buying a product fundamentally priced in $ (in fact, it is the only camera that I know of whose $price is higher than its £price - and that is a very RARE situation in rip-off Britain )

Cheers,
(and, we could move this to a new thread if others are interested)

[mwasilew]

Hi,

Is this tutorial still available somewhere? I found the text on web archive:
http://web.archive.org/web/20100511074245/http://www.aacadiz.com/zona_trabajo/tutorials/m27/en/m27procexample.html
The pictures are missing though So it is pretty hard to understand what is going on. I'd love to see the pictures back on the aacadiz.com website.

Cheers,
milosz

[Lex]

Hi everybody,

I read the whole post, and it sounds really exciting!!
Finally i wanted to check out the first link, but it doesn't work, there is a spanish error message, something like server down or so 

Thanks for the big work even if i not yet could admire it..

[Silvercup]

Hi:

I'll try to re-upload tomorrow.

Silvercup

[Lex]

Thx cause i am kind of curious 

[jeffweiss9]

There is a problem accessing the tutorial still.  In my case, when I do connect, my computer security intervenes and won't download anything from that site.  Other times, the site just times out.
-Jeff

[Lex]

Still the same on my side 

[dayers]

Is your server back up, Silvercup? I have been unable so far to find a working link to your tutorial.

Dave

[tonio]

Hello,

I tried to click on the provided link, but my antivirus software blocks opening the page, saying it detects a Trojan horse in it.

Clear skies

Antoine

[marekc]

I just checked the link to this tutorial on December 14th (2011), and the link still seems to be broken.

If the tutorial can be re-posted somewhere, that would be great. I'm dying to figure out how to do multiscale processing. I am using RBA's tutorial (on his website) and my notes from his recent SJAA talk, but I'd love to have as many sources of information as possible.

Multiscale processing seems to be a Pixinsight `killer app', but my efforts to `reverse engineer' this type of workflow is proving to be somewhat difficult. Hopefully I'll figure it out eventually, but any available tutorials are very welcome!

[georg.viehoever]

I tried to click on the provided link, but my antivirus software blocks opening the page, saying it detects a Trojan horse in it.

I had this as well sometime ago. It did not happen with Firefox, and it disappeared when I reinstalled Win7.
Georg