Following a wet start to the day as a cold front pushed through, I had a decent spell of blue sky this afternoon before the next band of squally showers came through. Seeing wasn't too clever in the unstable air mass, but transparency was about as good as it gets here in the UK. This shot was taken with the mini ERF removed from the BF10 and replaced with a Baader Neodymium Sky Glow filter in it's place. Visually there is no difference with or without, however imaging wise the image is significantly more contrasty, with only a slight reduction in exposure. My theory is that the Neodymium is cutting some infra red, which when imaging if passed lowers contrast causing a blooming effect - there is a pseudo spicule ring in my images that is present when the Neodymium filter is not there; I don't think this is actually a real spicule ring at all but rather a defocussed slightly larger overlay limb of the sun caused by noise leak at IR wavelengths. (I'm not saying the spicule ring doesn't exist - it clearly does - just in the context of my setup without the Neodymium filter).
Either way, I will be leaving the Neodymium filter in-situ from now on...
The image was taken with the DS40 at f20, DMK31, 6 panes assembled in photomerge CS4, I-USM applied and not a wavelet in sight! The black and white is my favourite, but i've included the colour for those who prefer that one!
Ha Full Disk Neodymium b&w by Mark Townley, on Flickr
The full size pic HERE! is definitely worth a look!!!
Ha Full Disk Neodymium Colour by Mark Townley, on Flickr
Full size HERE!
I'm really pleased with how this has come out! Have data for Ha disk without the Neodymium, CaK & WL disks too I need to process, however out for a meal soon so may not get these up till tomorrow.
Hope you like!
Mark
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