Quote:
Originally posted by janoskiss
Geoff, the mask will get rid of diffraction spikes from spider & help see the moon without making you go blind.
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Over time you get used to not seeing the diffraction spikes, you basically look straight past them. I don't have a problem with them. Something else to check is that your spider vanes are perfectly square to the optical axis of the tube. If they are canted or buckled at all this can greatly exaggerate the diffraction spikes and also create diffraction noise which will rob you of a lot of planetary detail. Another option is a simple off axis mask, but I prefer the brighter and more detailed views complete with invisible diffraction spikes, of full aperture.
CS-John B