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Old 24-09-2009, 06:32 AM
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multiweb (Marc)
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multiweb is offline
Join Date: Oct 2007
Location: Hinchinbrook
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Originally Posted by TheDecepticon View Post
I couldn't find it in here, but did I read some where about reflections pertaining to the filter glass in the noise piece of the QHY8? If I want to do RGB with the camera, do I need to use the UV/IR glass or can I take it out and just use the extension on the front of the nose piece with out the UV/IR glass and the MPCC? If I'm using a reflector, how does this affect my images in respect to star bloat/bleeding, UV or IR saturation? I have a 1.25 inch filter wheel that I'm gonna use(loss of field, vignetting, etc all understood already) with Ha, OIII & SII filters, so I don't need UV/IR for those, do I? Would it pay to use my 1.25" UV/IR filter in the filter wheel to capture a bit of RGB to go with my narrow band images?
I have a null adaptor which is a nosepiece without any glass. If you use any nosepiece with the MPCC you will get bright secondary reflections on bright stars. Not too bad on the UV/IR but a shocker with the clear one. For example you won't be able to image the HH or the pleiades without reflections but a lot of other targets won't be affected, like diffuse nebulae (i.e tarantula, eta carina, etc...)

When doing narrow band there is no need to have extra glass in the optical train. Just your NB filter and the MPCC on top of the null adaptor.
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