|
Hi Chris, nice to hear from you after such a long
time! Thank you for your comments! Actually the RHO Ophiuchi image is not a
stack but a mosaic of four images set vertically by two (a couple for the top
half and a couple for the bottom half). The original of this image is about
9.5Kpixel x 6.2Kpixels! I applied the tecnique of Mike Cook in PW to smooth the
image. Anyway the s/n ratio I got on most of the shots taken in Namibia was so
hight that apart from some targets I never had to strech very much to see all
details emerge from the background. Consider that visual magnitute at the zenith
was about 7.2/7.4, and at that latitude RHO was at the zenith. I was able to see
the blue reflection nebula visually through my Pentax SDHF75...
Another BIG problem of this shot was the fact that
one of the frames (the bottom right) suffered a lot from a light streak entered
in the camera (i don't know way) during the exposure and It took me more than
four hours to properly reconstructiong the image in PS. If you are
interested I will upload the part of the frame showing this problem to see
the before and after result... BTW also your shot of Saturn/Crab is very
nice!
Ciao
Marco
----- Original Message -----
Sent: Wednesday, April 09, 2003 8:54
PM
Subject: Re: [APML] (Many) New Shots from
Southern Sky, Northern sky and ageneralsite re-design
Hi Marco -
Your film shot of the Saturn/M1 conjunction is the best film image of the
event I've seen. Philip Perkins CCD image ranks up at the top in the CCD
world. Great job on it!
Good to see some more 400F being shot. It did a great job on your
southern sky images. Your Rho shot is wonderful! Did you
doing any smoothing on the image or was it the fact you had 4 trans of the
400F? I know when I stacked three 400F trans, the grain was almost
non-existent. Only if you really pushed the curves did the grain start
to become noticeable, but even then it was far less than Supra 400, PJ400
etc....
Chris
Dear friends, after a looong absence eventually
I am back in the list. Even
if I didn't participate during last months to
any discussion I did during
this time some new works with my instrument.
Tonight I uploaded a new
restyled version of my page with a lot of new
shots taken from Namibia (my
trip of last summer) and some recent good
job taken from my usual site in
Italy (in particular a good shot of last
January Crab/Saturn conjunction
visible under "Solar System" section).
Basically I kept only few shots of
the former work. I am currently
working on the many other shots I took in
Namibia of the southern sky and
I will reprocess most of the shots I took
during last years (no longer
visible in my site) but this task is so time
consuming (and I don't have
much time anymore to put on it) that I think it
will take some months to
be completed. In a near future also I am confident
to be able to complete
also the "Articles" "Author" sections of the page.
My site is always at
the same URL: http://www.astrosurf.com/lorenzi.
I
decided to keep the size of the pictures quite "generous", even if
it
meant having images up to 200KB in size. Since I am still working on
the
site every comment from you is particularly appreciated.
Here are
some of the new shots I uploaded under the different galleries:
SOUTHERN
SKY - TELESCOPE: all pictures are new, in particular I am
particular
happy with the mosaic of Eta Carinae, Rho Ophiuchi, Lagoon nebula
and
with the shots of the Tarantula nebula, B86 and Omega Centaury
SOUTHERN
SKY - LARGE FIELD: In particular I like the result I got of the
Southern
Cross and the impressive fish-eye view of the whole central
Milky
Way
NORTHERN SKY - TELESCOPE: in the Summer/Fall and
Winter/Spring sections I
particularly like IC4592 in Scorpius beside the
other shots from the
Namibian pristine sky (M16, M17)...
Clear
sky to everybody
Marco Lorenzi
_______________________________________________
Astro-Photo mailing
list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo
|