While on forum remember to keep refreshing page so you can see new info and personal messages

« Previous picture Next picture »
m57_20140720_dgs20 • by David Strange

This shows why an OIII filter is so good for viewing planetary nebulae.
The OII part of the image is brighter than the zero order. Taken with SA 100 diffraction grating.


Sign up, to leave a comment


Xobor Create your own Forum with Xobor