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.
Quote:
Originally Posted by alpal
Hi Greg,
I'd probably be better off with something like this which would work
with all the equipment I have now:
http://www.teleskop-express.de/shop/...rbon-tube.html
TS UNC 10" f/4 Newtonian telescope with German made carbon tube and 2" ACUN focuser
... Aperture 250mm - Focal length 1000mm - with optimized focus position for maximum illumination
... 94% reflection high quality diffraction limited optic - each telescope is tested on our optical bench
... only ca. 11kg weight with cradle rings!
I could always upgrade the mirrors & other parts at a later date for more performance.
At least it's light too!
cheers
Allan |