Don wrote,

Thanks for the link to the Plato image. It is a good question how high the TEC 160 can go without getting empty magnification.

When you or Siegfreid get around to testing the TEC, I also have a spreadsheet that can produce a list of currently visible Argyle's high precision double stars for resolution testing. For an extended object test, here's another crater diameter sequence chart for Mare Serenitatis. http://www.lpod.org/?m=20060917 - Kurt Argyle, R. (ed). 2004. Tables 2.1-2.7, Test Stars for Binocular through 600mm Telescopes. In Observing and Measuring Visual Double Stars. Springer. _______________________________________________ Sent via CSolutions - http://www.csolutions.net