Quote:
Originally Posted by rally
Steve,
The light is travelling a different path because there is no "lens" element in the luminance position.
Try a clear/luminance filter in this position of the same thickness as the RGB and the problem should clearup !
This is the standard setup for LRGB imaging - the Luminance filter should have all the same sort of anti reflective coatings etc as the other three.
LRGB filters are usually sold in parfocal sets.
Rally
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Pete, Rally, thanks for the help,
Apart from the reason to equal the lens effect of the nosepiece IR
in the Luminance position.....wouldn't it be 'doubling up' on the
IR side of things?
Two filters doing the same job...? This is how it's really done?
As for my filters, I have only the cheap Meade RGB/IR set that came with
the DSI Pro II......and an extra Baader IR cut fulter.
I use the Meade RGB in the platter and the Baader up front in the nosepiece.
I will try the spare Meade IR in the 4th platter position, hopefully it doesn't decrease the results in my luminance channel too much.
thanks guys,
Steve