Diffraction spikes viewing Jupiter
I recently (second outdoor activity) tried my scope out on Jupiter.
Good view through my 28mm SW eyepiece - not so good seeing, but enough for me to appreciate as a newbie.
Then hooked up my Nikon D90 and take some pics. Mmmmmm
Diff spkies....yes I understand that the supports of the secondary mirror causes this.
I could not focus any further 'down' .
a) Does a focal reducer help me focus further 'down' when a DSLR is attached ?
b) OR does a Barlow put the focal plane further back ? in other words , does it reduce the focal length of my scope? ( is that what a focal reducer does?)
c) and would this -either of the above options- reduce the diff spikes?
d) does a smaller eyepiece ( say 10mm) reduce diff spikes?
Grrrr trying to work out focal lengths, FOV, focal planes etc as a noob is frustrating - but rewarding....as I know that in a few weeks i'll be saying to myself "Dooooh that was soooo simple!"
Anyways,
Thank you in advance for any advice!!!!!!
Bartman
|