|
Hi, with the clamshell chip in the 6" refractor lens, instead of masking and therefore reducing the aperture, it is worthwhile blackening the chip with a black felt pen. It will show as a gap in the diffraction pattern in out of focus star testing but because it is blacked out and wont allow light throughput, you wont get the "small diffraction" you mention when observing and will still get the benefit of the full 6" aperture. I have a 5" f8 frac , with a chip in the lens ( don't ask ) and just blacked it out and the scope works fine for visual
I would also still prefer the 8" dob over the 6" , will go that bit deeper in magnitude and resolving and magnification and really is not that much bigger to carry / transport. I've previously had both so am aware of what is involved. Enjoy your purchases, don't know anything about sky Align though so can't help you there.
|