This month sees something we have not, I think, done before -
OSC data captured with a dual band filter to allow for either standard colour or HOO processing.
Its my own data this time and my original post can be found here to see what you have
viewtopic.php?f=66&t=22007
In that post the data was stacked in
PI and then the red and green channels extracted as
Ha and Oiii
However,
APP has special stacking algorithm's which it says produce better
Ha and Oiii images than a straight extraction of the channels. Thinking it would be interesting to test that claim, I have provided 3 images from
APP -one
Ha, one Oiii and one
Ha/Oiii colour each produced using the
HA/Oiii algorithms.
I've also provided the original
PI stack.
Capture details; SW80 ED (
SW 0.85 reducer/flattener), ASI2600mc pro, 2" Optolong L-enhance 90 x 180s Gain 100, Offset 50, -10c (
FL 510mm Picel size 3.76 micron)
KNOWN ISSUES WITH THE DATA
1. Something happened while I slept to knock the mount very slightly out of line - (cable snag, gear slip, local Tom-
cat having a laugh????) I dont know. but its produced a very noticeable overlap top and bottom.
2. There is a big dustbunny on the lights to the right of the fish-head. These are on the lights but not my flats (which were done first thing in the morning) again I don't know what happened between flats and light but it was on another data set I collected that night. In that one it was just on background sky so I just clone stamped it out in the starless version. But in this one it covers detail and I had no ides for how to get rid of it - Do you? Anyway - its why there is no fishhead in my image
I've provided each file as 32 bit fits and xisf and 16 bit tiff for anyone using
PS. If you want something else, PM me.
Data is here
https://1drv.ms/u/s!Alj6NhuYfZtW73SPHnW ... v?e=NelArv
So Download what files you want and process in your software(s) of choice then post in this thread. The purpose of the
APP Challenge is to share techniques so we can all learn and grow in our abilities so please describe your process steps and any special tricks you used to get your result. If you have been finding something difficult to do with this data - tell us and hopefully someone will be able to help.
Please consider submitting some data of your own for future challenges. Just send me PM and I'll take it from there.
Enjoy the challenge.
David
Scope: Skywatcher Evostar 80ED (SW 0.85 FR/FF) on a SW NEQ6Pro
Guiding; SW Evoguide 50ED, ASI 120mm mini
Meade 8" LX200 GPS on wedge (Guided with a cheapo 50mm guidescope and a ZWO ASI 120mm mini)
Sharpstar 61EDPH II (with dedicated 0.8 reducer) with wiliam Optics 32mm uniguide
Camera: ASI2600MC pro. QHY 163M with ZWO 7nm NB filters, Canon EOS700D astro mod
Secondary mount: Skywatcher StarAdventurer
My Astrobin
https://www.astrobin.com/users/mackiedlm/