ASTRO: Owl in [OIII]

this is 18 x 10 minutes binned 2x2 using the CM10, 18" Cassegrain and Baader
[OIII]

when i was stretching it hard I noticed that my flats aren't quite as
effective as I had hoped

I know that when I took them I just assumed i was in focus and I now know I
was quite a bit off

So I guess I will redo them

Richard Crisp wrote:

this is 18 x 10 minutes binned 2x2 using the CM10, 18" Cassegrain and Baader
[OIII]

when i was stretching it hard I noticed that my flats aren't quite as
effective as I had hoped

I know that when I took them I just assumed i was in focus and I now know I
was quite a bit off

So I guess I will redo them


A ghostly owl. In RGB it is blue with a red outer edge. I wonder if
that is hydrogen or something else. You planning on completing your
usual color palette?

Rick


--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

"Rick Johnson" wrote in message
...


Richard Crisp wrote:

this is 18 x 10 minutes binned 2x2 using the CM10, 18" Cassegrain and
Baader
[OIII]

when i was stretching it hard I noticed that my flats aren't quite as
effective as I had hoped

I know that when I took them I just assumed i was in focus and I now know
I
was quite a bit off

So I guess I will redo them


A ghostly owl. In RGB it is blue with a red outer edge. I wonder if
that is hydrogen or something else. You planning on completing your
usual color palette?


It is [OIII] Rick

I will shoot Hydrogen next

It will be brighter a bit away from the core so when the two are combined
into color the outer part will be red

I've shot this guy before like that

It seems like last time I tried, I found no [SII], so the plan right now is
Hydrogen and Oxygen and maybe I will try some blue or something else...

this was 2006's less than optimum attempt:
http://www.narrowbandimaging.com/m97..._6303_page.htm

Beautiful smooth image Richard.
Actually I always do an additional "software" flat in AstroArt on my imaged
as they always have some gradients even after careful flatfielding. The
gradients with the flat are usually not visible unless I stretch the image
very hard, but I still remove it, you never know if someone will spot it
otherwise ;-)

Stefan


"Richard Crisp" schrieb im Newsbeitrag
...
this is 18 x 10 minutes binned 2x2 using the CM10, 18" Cassegrain and
Baader [OIII]

when i was stretching it hard I noticed that my flats aren't quite as
effective as I had hoped

I know that when I took them I just assumed i was in focus and I now know
I was quite a bit off

So I guess I will redo them

in this case it is not a gradient but a slight dust mote artifact that
wasn't completely corrected

I am pretty sure that if the scope was close to focused (it was not) when I
shot the flat that the dust mote would be 100% corrected

The scope was out of focus because I had just taken it partially apart and
tuned it up and then reassembled it

I made some adjustments on the primary mirror cell that ended up changing
the mirror separation by a small amount but enough to defocus the scope.

It was off over 1000 ticks when I focused it.

I get a mirror separation change of 12.5 mils (1/80th of an inch) per 900
ticks from my Robofocus


"Stefan Lilge" wrote in message
...
Beautiful smooth image Richard.
Actually I always do an additional "software" flat in AstroArt on my
imaged as they always have some gradients even after careful flatfielding.
The gradients with the flat are usually not visible unless I stretch the
image very hard, but I still remove it, you never know if someone will
spot it otherwise ;-)

Stefan


"Richard Crisp" schrieb im Newsbeitrag
...
this is 18 x 10 minutes binned 2x2 using the CM10, 18" Cassegrain and
Baader [OIII]

when i was stretching it hard I noticed that my flats aren't quite as
effective as I had hoped

I know that when I took them I just assumed i was in focus and I now know
I was quite a bit off

So I guess I will redo them

Nice shoot Richard!
I allways wunder with this nebula if i forgot to put my glasses on...
Reg
Dirk

--
Dirk van den Herik

A journey of thousand lightyears
starts with the first step.
"Richard Crisp" wrote in message
...
this is 18 x 10 minutes binned 2x2 using the CM10, 18" Cassegrain and
Baader [OIII]

when i was stretching it hard I noticed that my flats aren't quite as
effective as I had hoped

I know that when I took them I just assumed i was in focus and I now know
I was quite a bit off

So I guess I will redo them

Looks very good Richard!

Richard Crisp wrote:
this is 18 x 10 minutes binned 2x2 using the CM10, 18" Cassegrain and Baader
[OIII]

when i was stretching it hard I noticed that my flats aren't quite as
effective as I had hoped

I know that when I took them I just assumed i was in focus and I now know I
was quite a bit off

So I guess I will redo them







--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3