Re: [William Optics] Re: NGC6960 w/ FLT132 & DSI Pro III
- Hey Drew!Great to hear from you. Yes, the halo is a reflection and it's mostly in the green layer, definitely a reflection between the filter and I think the reducer but it could be the CCD's cover glass as well. I'm shooting a luminance for it now and will then shoot an HA layer. I hope the HA layer will take out most of the reflection, I'll use some voodoo to take out the rest ;^)Matt----- Original Message -----From: ancient.sullSent: Monday, June 30, 2008 6:39 PMSubject: [William Optics] Re: NGC6960 w/ FLT132 & DSI Pro III
Your camera is a monochrome DSI camera + filters, right? The halo
looks like filter reflection artifact
One stunt I have found useful if there is a bright star causing halo
artifact off the filters is to take images with that star in the
_exact_ of the chip. That way the halo artifact is symmetic, less
obtrusive and a little more easily processed.
I recently did an image of the Antares-Rho Ophiuchi area where
Antares was necessarily far off center.
So I took most of the subs image centered to make a pleasing
composition, but did some extra images centered directly over Antares
and with much shorter subexposures. Then I used Photoshop layers to
show just the area immediately around Antares from the short,
centered subs, and the rest of the field from the longer subs.
Doing this I got a small, less noticeable and symmetic halo and could
show the area which would otherwise be masked by the halo.
(and if you think your transparency is bad:
http://www.ancients tarlight. com/EastOfJava. html
That's smoke from the fires in California. The bottom image is the
moon with a Z66SD and Canon EOS. The bloated red thing in the first
image is the only star one can see in California at the moment, the
one that's only 93 million miles away)
Drew Sullivan in Smoky California
--- In William-Optics@ yahoogroups. com, "Matt Taylor" <matttaylor@ ...>
> Hi All,
> First good sky I have in some time, still, seeing & transparency
were terrible. It took all of my post processing voodoo to produce
this photo from 12 x 5 minutes each R, G, &B.
> http://www.pbase. com/image/ 99484433
> Maybe I can get a good luminance for it someday soon and make it
> Best Regards,