I have had owned a Celestron C150HD, short tube newtonian for about 3 years. I have been pleased with the stability of the OTA on the mount and overall have enjoyed using the scope. However, I am disappointed in the maximum useful magnification I have been able to get out of the scope. Planetary images are sharp as a tack at 100X, but at 160X the image starts to breakdown and look fuzzy. I would like to know if others have this problem. Also, I'm wondering if it is a characteristic of short tube newtonians. This scope uses an auxillary corrector lens before the secondary to squeeze a 1000mm focal length in a short tube.
I have not collimated the scope but have performed the "star test" and the results indicate collimation is okay.
I have not collimated the scope but have performed the "star test" and the results indicate collimation is okay.
