Hi Steve,
For imaging the Horsehead or dust type objects you are better off with either no filter at all or a clear filter with no UV/IR cutoff. It is already very dim and it is robbing you of valuable light for the image. Your stars will bloat slightly but you will be better off.
Greg.
Quote:
Originally Posted by kinetic
Hi,
Just for the record, the arrangement suggested in the posts below
works fine after testing ...refocus is almost not needed now
between R,G,B or just Lum shots.
This was after I put the Meade IR in filter position 4.
R is pos 1
G is pos 2
B is pos 3
and the Baader IR is in the nosepiece.
HOWEVER!!!!!, the Meade IR filter cuts off the IR far too early
compared to the Baader IR and so, when I am imaging something like
the Horsehead Neb, it's a struggle to pick up the shape of the
horse with the Meade IR in place.
Previous attempts at the HH with only the Baader IR , (in combination
with and without RGB), the shape was easily seen in 5sec subs.
I don't know if this loss of the Ha is due to the combination of
using both IR filters combined...or just purely the premature
cutoff characteristic of the Meade IR.
Looks like I should ditch the Meade IR and get another Baader IR...
or just put up with refocusing between L and RGB.
Steve
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