it looks like i am having issues with the filter wheel, i think that image was actually a Lum, i dont think it is actually turning. so no chance of working this one out just yet. will post when i have progress
it looks like i am having issues with the filter wheel, i think that image was actually a Lum, i dont think it is actually turning. so no chance of working this one out just yet. will post when i have progress
Having not stretched it at all makes it a little more difficult but that is definitely not SII, the fickle finger looks very different in SII compared to Red and Ha, its edges glow more with a darker immediate surrounds, it should almost look like a negative, so, that looks like Red to me as the nebulosity is not quite dense enough to be Ha, buuut possibly Lum like you say though...
thanks mike, a reboot of the computer got the filter wheel working, i will post some examples, I am fairly confident on what it is but i will see what everyone else says
going from the running chicken shot I'm going with it not being a Sii filter.
here are a couple of reference shots Ha / Sii for people to eyeball if they like. not much stretching at all but you get the idea S2 is very very very thin near the boks even after a severe stretch (which I probably should have posted).
Aidan,
There's a quick and accurate way of checking and confirming the bandwidth......
Is there anyone in the area with a slit spectroscope?? Two minutes with a spectroscope and some sunlight will definitely give you the answer.
Aidan,
There's a quick and accurate way of checking and confirming the bandwidth......
Is there anyone in the area with a slit spectroscope?? Two minutes with a spectroscope and some sunlight will definitely give you the answer.
You know I did think of that and I actually thought you might make that suggestion. I don't know anyone in the area who has one I could borrow. If there is someone in Sydney that I can borrow one off then I wouldn't turn it down. Alternatively I will work off a consensus based on the pictures. It is not a cheap decision to make though
Hi Somnium - I actually took my Sulpher Filter out of my filter wheel and replaced it with a 3nm NII and Replaced the Ha with a 3nm filter as well - couple of test images I took. Could be an idea.
i might stick the the standard filters. i dont plan on doing too much NB imaging, my main focus is on galaxy imaging. however, it is good to have a target to shoot during the full moon. we get precious limited time to image that we need to utilise it all.
anyone else with ideas as to what filter it is ???
Hi Aidan,
I am not familiar with the other objects you have posted but I do have a side by side comparison of an easy target at the moment: NGC2437 (M46).
The star cluster includes a planetary nebula that is strong in Ha and weak in S2. See the attached screen cap for a two uncalibrated frames linearly stretched the same from the bgd, both about 1297 adu, to 2000 adu, which is just above the brightest part of the ring. The very brightest part of the ring is about 100 adu for S2 vs ~700 adu for Ha above the bgd.
This is from a Apogee U16M (16803 CCD), what CCD do you have?
