Hi,
I've only just started playing with my modded 350D on my AOE 80ED and had a go at the Eta Carinae last night. The picture I've attached is the unprocessed raw which shows the noticeable purple halos.
The 350D has been modded by simply removing the IR filter, so I'm using a Hutech IDAS LPS filter as its replacement. (Hutech has informed me the filter completely blocks NIR up to 1000nm and will work as a UV/IR blocking filter for the camera.)
My AOE 80ED is a ED Doublet Fully Multi-Coated Refractor. (
http://www.aoe.com.au/ed80.html)
So my question is; why do I have the purple halos? Apparently they are caused by Achromatic Refractors, excessive IR or I think poor focus. I have an ED/APO refractor and my IR is filtered so I’m a bit lost. I did spend a lot of time trying to the focus it correct, but that’s not to say I succeeded.
Any suggestions would be much appreciated, I’m hoping it’s my inexperience and not my scope
Thanks
Markus