From: "Alan Friedman" <alan@greatarrow.com>
Date: June 19, 2006 8:35:25 PM MDT
To: <Astro_IIDC@yahoogroups.com>
Subject: Re: [Astro_IIDC] Jupiter June 15
Reply-To: <alan@greatarrow.com>
Hi Phil -
By unfiltered I meant luminance through the clear or IR blocking filter, rather than
through the RGB filters. Your seeing seems good enough for this to work well - it
will provide more light for good signal/noise in your 6". Up my way the image is
very turbulent using the full visible spectrum - I almost always get a steadier
image by limiting the bandwidth. You can see the improvement easily observing
the moon unfiltered compared to through the red or IR filter - the air is steadier
down at these wavelengths.
best,
Alan
---------- Original Message ----------------------------------
From: Phil Houston <pkh111@knology.net>
Reply-To: Astro_IIDC@yahoogroups.com
Date: Mon, 19 Jun 2006 17:34:01 -0400
---------- Original Message ----------------------------------
Alan,
Thanks. I am using a filter set from True Technology containing a
clear, Ir block, R,G,and B filter. I must use the Ir blocking filter
in order to get a decent color balance so the Ir filter is used with
all other filters. So far it's been a convenience issue rather than
a performance one. Removal would require disassembling the setup. I
should try an unfiltered luminance, though. What do you recommend?
I enjoyed your comparison between the 6" scope and 10" as it pertains
to alignment and stacking. Using a 2x Barlow increases the scale of
my raw footage as does the 2x resampling before alignment so I feel
that some of your and Milton's comments apply to me as well. I have
imaged Jupiter without the Barlow in place and produced good images
but when upscaled they did not seem quite as detailed. There are so
many variables I get a little overwhelmed. I do regret that I must
over sharpen the images in order to pull out details. It makes them
look rather grainy and produces a nasty ring at the edge of the
planet. Any processing tricks to eliminate them??
Looking forward to seeing your latest.
Phil