Quote:
Originally Posted by gregbradley
Diffraction limited is 1/4 wave. Orion Optics (who make the mirrors for this scope anyway) offer a 1/10th wave mirror. I think that would be important. F4 is probably a little more forgiving and less "fiddle factor" and bug chasing involved. This is supposed to be a relaxing hobby!
Greg.
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Thanks Greg,
What about the QHY9 mono cameras?
I wonder if they can be re-engineered to give a shorter back focus?
Someone may be selling shorter nose pieces -
I have yet to find out.
Maybe a few mm could be taken off the front of the camera
by reducing the housing in some way -
& another few on the thickness of the filter wheel?
QHY should have done this anyway.
Unless I can solve the back focus problem I can forget upgrading to any other Newt.
I don't want to remove the nose piece.
As you can see from the picture below I have used the QHY9's proper
desiccant barrel which attaches to the side of the camera
to remove any moisture from inside the camera.
They can't tell you at QHY to do that &
also tell you that you can run it without the nose piece.
The desiccant wouldn't work.
Don't get me wrong -
the QHY9m camera is great -
it's just not designed for Newts. where you need to use a larger than 2" focuser.
For 2" focusers:
The 2" RCC1 solves that problem by giving it 91.5mm of back focus to play with.
cheers
Allan