Scott, As you try planetary exposures, these are generally done be experimenting with your camera settings to "bracket" the correct exposure of a particular scope, camera and planet. However, you will probably be wanting an initial guess for a first exposure setting. The following are three calculators that all implement Covington's exposure calculator from his "Astrophotography from Amateurs." The calculator will give an initial guess for solar system objects. http://www.rphotoz.com/astrophoto/expcalcs.html http://www.starizona.com/ccd/calc_ideal.htm http://www.covingtoninnovations.com/astro/astrosoft.html - Kurt _______________________________________________ Sent via CSolutions - http://www.csolutions.net