From: "Wolfgang" <wreiff1@t-online.de>

Date: September 22, 2010 5:57:46 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Sun imaging

Hello sun imagers,

my setup for sun imaging consists of a Baader energy reduction filter in front of the refractor followed by a 4X telecentric and finally a solar spectrum filter behind the focusser.

The camera in use with Astro IIDC Version 4.06 GM1 is a Point Grey Scorpion.

Being plagued by dust donuts on the camera's chip, I want to work with flats.

Unfortunately the advice offered by Astro IIDC's manual does not work.

I used 3 frames as proposed with the telescope not pointing to the sun but the results are no good.

The manual states:

"You should create flat frames by attaching the camera to your telescope or lens, then pointing it at about a 50% or so evenly illumination object and then taking an image."

However with the ERF plus the .5 Angstroem filter I do not know how to obtain correct illumination.

When imaging without the Ha filters, I normally use a flatframe-lightbox and have no problem to achieve the necessary adu's for the DSO-Camera , but I just cant figure out how to do it with the above mentioned equipment on the sun.

I hope that one of the sun buffs can advice a newbee.

Thanks in advance

Wolfgang