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Hello There
Thanks for all the replies. Using the four inch mask allows me to get high magnifications. Sometimes I can go high as 300 mag. Without the mask objects breakdown a little after 100 mag. Which filter will allow me to up the mag with full aperture? I once tried a #12 yellow but it did not work. By the way I have a six inch aperture F8 DOB. However, I do not like the diffraction spike on Jupiter and Mars. Also with the DOB I can not change the angle of the focuser to stop Crater Illusion when viewing the Moon.
Thanks to you all
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