That is a beautiful image of M16, really quite spectacular! I love both the image scale and the wide view, not often seen together like this. Well done!
Great image with lovely clarity and contrast. Not sure about the colours and the bird is upside down. Amazing how you get use to seeing the pillars going up not down.
Like it a lot.
Could I please ask, when you say, LRGB, (Ha, SII, Ha, OIII), 120, 30, 120, 30 minutes, SII and OIII binned 2x2. What exactly was the process for filters? Sorry if this is a silly question but I don't understand how you used the filters in the LRGB process. Do you use a different filter for each of LRGB?
Could I please ask, when you say, LRGB, (Ha, SII, Ha, OIII), 120, 30, 120, 30 minutes, SII and OIII binned 2x2. What exactly was the process for filters? Sorry if this is a silly question but I don't understand how you used the filters in the LRGB process. Do you use a different filter for each of LRGB?
Frank
Hi Frank,
Sorry about that, I'm getting into lingoland again, the problem with speaking in lingo is it sort of excluded people who don't know what you're talking about. If they don't ask, then they're excluded from the conversation, so thanks for asking.
So "LRGB, (Ha, SII, Ha, OIII), 120, 30, 120, 30 minutes, SII and OIII binned 2x2" means...
For LRGB - I have a monochrome camera, so in order to get colour I have to shoot through at least three different filters and then recombine them as a red channel, a green channel and a blue channel. In this case I've overlayed another channel called luminance which is also monchrome and gives the image more resolution.
For (Ha, SII, Ha, OIII) - these are the filters I used. They are narrowband filters centred on the wavelength of the emmision of Hydrogen, Sulphur, Hydrogen again (infact I just reused the data) and Oxygen, where Ha was used for the luminance and green channels, Sulphur for the red channel and Oxygen for the Blue channel (this is commonly known as the "Hubble Pallette").
For 120, 30, 120, 30 minutes - These are the times I exposed the chip for in total, this was made up of shorter exposures, which I have omitted the details of.
For SII and OIII binned 2x2 - This means I have "binned" the pixels 2x2 in the sensor, where a set of four pixel values are added to give one value, this increases the sensitivity of the camera at the expense of resolution. For the colour channels the loss of resolution is acceptable to shorten exposure times.
Sheeze!!!! That's a seriously high def shot Stuart!!! Fantastic! Well done! The seeing must have been pretty darn special that night too!! Hmmm, and I almost like the colours too ...
... 
