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My long focal length setup is used principally for galaxies, globular clusters and planetary nebulae. Sometimes I will use it for smaller diffuse nebulae like M20.

I image with the C9.25 reduced 0.63 for a focal length of about 1500mm, and with the Canon 350D this gives an image scale of roughly 0.9arcsec/pixel.

This C9.25 seems to have very good to excellent optics as it produces very sharp images when I do my job right.

I have changed from a dual saddle setup to a straight piggyback setup in an attempt to remove some differential flexure I have been fighting in all my setups, not just the long focal length setup. I have the same field movement with the 130/780 and ED80 as well. It has been proportional to the focal length


May 22, 2008

Celestron 9.25 on Mach1GTO

Celestron 9.25 on Mach1GTO

Celestron 9.25 on Mach1GTO

Celestron 9.25 on Mach1GTO

Closer View

Closer View

Another Close View

Another Close View

Guidescope and Attachments

Guidescope and Attachments