Hi Robin,
That sounds like a useful feature!
What I typically do is to scan in a zig-zag pattern, but because of backlash
problems in my RA gear I only image on the 'zags' (or is it the 'zigs'?) - I
scan back as quickly as I can, let the gears catch up, then move down to
start the next line. I normally set iCatch imaging with a delay of 3 seconds
or so between exposures, which gives me time to nudge the scope when I hear
the relays click.
Between each image I shift perhaps a quarter of the FoV, maybe less, so that
most areas get plenty of coverage. In the LeoTrio image I took multiple
overlapping exposures of the galaxies, so there should be better s/n in
those areas. I should really have been disciplined and done the same thing
everywhere.
It occurs to me that doing a non-linear stretch on a composite image will
highlight areas where the noise level varies, because the local average
brightness will change. Maybe I need to add a feature to iMerge (or AVIDark)
so that the non-linear stretch can be done before the automatic brightness
adjustment, which should hopefully reduce some of the patchy appearance of a
stretched mosaic.
Jon.
<em class="quotelev1">> -----Original Message-----
<em class="quotelev1">> From: niborl2000 [mailto:robin_at_leadbeaterhome.fsnet.co.uk]
<em class="quotelev1">> Sent: 07 April 2003 17:01
<em class="quotelev1">> To: QCUIAG_at_yahoogroups.com
<em class="quotelev1">> Subject: [QCUIAG] [CONGRATS]Re: 'Leo Trio' mosaic
<em class="quotelev1">>
<em class="quotelev1">>
<em class="quotelev1">> Hi Jon,
<em class="quotelev1">>
<em class="quotelev1">> It might be possible to do this with my ss2k. It has a tour feature
<em class="quotelev1">> (which I have never actually used) which will move between objects
<em class="quotelev1">> in a predefined list, stopping a settable time at each one. If I
<em class="quotelev1">> could get it to tour on a list of user entered coordinates, it could
<em class="quotelev1">> do all the hard work for me :-) I will have to look into it.
<em class="quotelev1">>
<em class="quotelev1">> Robin
<em class="quotelev1">>
<em class="quotelev1">> --- In QCUIAG_at_yahoogroups.com, Jon Grove <JGrove_at_S...> wrote:
<em class="quotelev2">> > Thanks Robin,
<em class="quotelev2">> >
<em class="quotelev2">> > I quite enjoy the challenge of these 'wide-field' shots, I think
<em class="quotelev1">> they suit
<em class="quotelev2">> > my scope (750mm FL) and it's nice to see the wider picture emerge
<em class="quotelev1">> from all
<em class="quotelev2">> > the little frames. One day I'll get round to computerising my
<em class="quotelev1">> scope, then I
<em class="quotelev2">> > could set it up to scan the area automatically while I keep warm
<em class="quotelev1">> inside...
<em class="quotelev2">> >
<em class="quotelev2">> > Jon.
<em class="quotelev2">> >
<em class="quotelev1">>
<em class="quotelev1">>
<em class="quotelev1">>
<em class="quotelev1">> ------------------------ Yahoo! Groups Sponsor
<em class="quotelev1">> ---------------------~-->
<em class="quotelev1">> FREE Cell Phones with up to $400 Cash Back!
<em class="quotelev1">> http://us.click.yahoo.com/_bBUKB/vYxFAA/i5gGAA/N_XolB/TM
<em class="quotelev1">> --------------------------------------------------------------
<em class="quotelev1">> -------~->
<em class="quotelev1">>
<em class="quotelev1">> --Please keep your subject line relevant! CHANGE IT if the
<em class="quotelev1">> message topic changes significantly.
<em class="quotelev1">> Start a NEW post if you're starting a NEW topic (this makes
<em class="quotelev1">> search by thread work correctly).
<em class="quotelev1">>
<em class="quotelev1">> To unsubscribe from QCUIAG, mailto:QCUIAG-unsubscribe_at_yahoogroups.com
<em class="quotelev1">> For a "no-mail" (web read) subscription
mailto:QCUIAG-nomail_at_yahoogroups.com
For daily digests (which does not include attachments)
mailto:QCUIAG-digest_at_yahoogroups.com
You need a valid YahooID to access list archives, files, photos and details
at:
http://groups.yahoo.com/group/QCUIAG
Visit the QCUIAG website at: http://www.qcuiag.co.uk to keep up with
developments.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
<p><p><p>[Message filtered and checked by MIMEsweeper]
