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Hi,
could someone confirm if I can use the following on an 8" F4 scope
50mm secondary, 32mm low profile focuser.
my current setup is
63mm secondary, 50mm focuser. mirror is moved up by around 9cm.
i ran both through newt for windows and got the following results
63mm secondary, 50mm focuser
-vignetting of 75% ray at front aperture - yes
-obstruction by diagonal - 32%
-angular field of view for 100% illuminated area - 1.527 degree
and for
50mm secondary, 32mm low profile focuser
-vignetting of 75% ray at front aperture - none
-obstruction by diagonal - 25%
-angular field of view for 100% illuminated area - 0.7074 degree
can someone pls clarify what the practical implication is with reduction of angular field of view for imaging or visual?
i'm thinking of using a 50mm secondary, low profile focuser and moving my
mirror back.
can the reduction in obstruction by 7% be related to say contrast or limiting magnitude?
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