- View SourceDoes anyone know if WO makes an erecting eyepiece? I have searched
around and the only one I can find is made by Skywatcher. WO might
consider marketing one or even better, a telescope adapter, like Nikon
used to make, that allows the pre-focusing of camera lenses for
astrophotography or as make shift terrestrial telescopes...Dave V
- View SourceI'm not aware of an "erecting eyepiece" but they do offer erecting
diagonals which will carry a standard eyepiece and present an erect
image to the observer.
I have the 45 degree erecting eyepiece and it works fine in daylight.
It's definitely not something you would want to use at night. CN has a
review - iirc in the forums.
As has been commented previously, the resolution of camera lenses is
seldom as good as even a basic telescope can offer. The poor image
quality combined with the eye's accomodation for slight focus
inaccuracies makes me skeptical that critical focus could really be
achieved by substituting an eyepiece.
That said, you could use a Ronchi or knife edge focuser to prefocus -
or maybe even a Hartmann mask with the camera attached. These
techniques tend to require you focus on a bright target then point the
camera at whatever you're interested in.