ollypenrice

It's an edge artifact from the Ha layer and I thought I'd fixed it in the latest version! I'll check it out again. Thanks, Wim. Olly Edit: Fixed.

Managed to squeeze a bit more out of the Ha: Olly

That's really good. Olly

Very good indeed. For me the colour is a bit 'green high, red low.' Olly

From Kit Marlowe's doomed Dr Faustus, perhaps? See, see, where Christ's blood streams in the firmament! One drop would save my soul, half a drop: ah my Christ! Olly

Sexy title, eh? This is a three-up effort with Paul Kummer capturing and pre-processing 3 hours per panel (2 panels) in the RASA 8 and Tom O'Donoghue devoting 18 hours (eighteen) to 3nm Ha in his Tak FSQ106, based here robotically. My post processing. This supernova remnant is in Auriga and shares the field with an assortment of LDN objects. Despite the 18 hours the Ha was agonizingly faint and had to be tortured horribly to get as far as this. So, a nice round 24 hours' worth: Bigger one is here: https://ollypenrice.smugmug.com/Other/Emission-Nebulae/i-24vBwxW/A Edit. Please scroll the thread down for final version. Olly.

You absolutely do need flats. They are truly at the heart of things in AP. Olly

Indeed! However, I've no idea how one might go about making a widefield image from a single focal length. Is it even possible? lly

Very helpful, George. Thanks. You're in safe hands with Dave Wills, he's a good guy. Olly

You can be absolutely sure that we all send her our best wishes and condolences. Olly

Valid question. Our situation is that we want to squeeze a fifth robotic instrument into a roll-off roof shed designed for four piers. The instrument is just a Samyang 135 lens, so very small, and we can get away with squeezing this setup in if it is free of counterweight arms, etc. The AM5 mount and camera are perfect for the limited space available. At present the Samyang is occupying a main pier and this isn't necessary, it's overkill. Olly

Quality takes time. Nice one! Olly

Tom did the postage and packing. Regarding printing, even when you follow the correct colour protocols you'll want to see a test print or two first before committing to a big one. I now do my own prints, up to super-A3, and find results unpredictable, so I'll do several 10x15 tests first, adjusting the image accordingly. Usually this has to do with the brightnesses at the bright end but blue saturation can often be sky high for some reason, even with a calibrated monitor. Tom went to the printer in person to run through this procedure. A 1.0 x 1.8 metre print costs several hundred euurs so you don't want to lose one! Olly

Perfect. Thanks, Peter. Olly

Well spotted. The difference is just half a point in Ps Colour balance, midtones, away from green towards magenta. That's one point, faded by 50%. Because I wasn't confident about the background reds I reduced their colour saturation early on. Olly