Hi There, Could someone tell me please? What are the STAINS ? captured in the Light file attached ? captured with SBIG 10XME+CW10 ! Are the STAINS ! located on the CHIP ? or on the GLASS/windows on CFW10 ? the SCOPE + REDUCER are clean and how can I remive this ?? Thank you Martin I am attaching Link to the files.. since they are too big to upload here.. 1) The Light File, with STAIN.. http://nova.astrometry.net/user_images/768024#original 2) 2nd One with STAIN ! http://nova.astrometry.net/user_images/768020#original 3) A Dark.. http://nova.astrometry.net/user_images/768029#original
Hi Martin, To me seems donuts related with dust. Look at this site use the calculator to define the distance from the chip, that will answer your question. http://www.ccdware.com/resources/dust.cfm This other site tell you how to clean the cover glass of your CCD. http://www.hiddenloft.com/notes/CCDclean.pdf Cheers Antoine
Thank you Antoine, for taking time to answer , I will follow the cleaining process under http://www.hiddenloft.com/notes/CCDclean.pdf Best wishes from Vienna Martin