Hi all
As I get more experienced with IRIS, processing my modded 350D images, I managed to come up with this image of M42.
Its 2x 10 mins ISO 400 masked with 2x1 minute ISO 400 images shot with modded 350D, 10 inch f5.6 scope with UHCS filter and MPCC. Initial processing, dark subtraction etc. up to final result with the 2x10 mins images done with IRIS, with tweaking of the 2x1 min shots and the masking of them together with Photoshop CS.
Scott
Wow! That's groovy!
Ok, I have to ask a dumb question...
Why do you "2x 10 mins ISO 400 masked with 2x1 minute ISO 400 images"?
Please feel free to point me to an existing article.
Thanks in advance!
Baltica....the reason being the trap is well over exposured with such a long exposure image taken so you take a shorter one and mask it into the longer exposure...if scott didn't do this the whole trap would just be a big ball of light with no detail.
Howdy everyone.
Thanks. Actually is is sort of Ha and OIII as the UHCS filter favours Ha and OIII wavelenghts I actually tried imaging M42 with my 7 Nm Ha filter and it was disapointing, not as much detail as the colour UHCS image.
Here is an article that I learn the masking technique from http://www.astropix.com/PFA/SAMPLE4A/SAMPLE4A.HTM
HOWEVER, I dont know whay they say in point 4 to paste the LONG exposure into the mask, I get much better results if I pase the SHORT exposure into the mask. That was the inner detail of the short exposure appears, and the faint outer detail of the long exposure is maintained.
That is a hubble image right? its not yours!!! i refuse to believe it is j/k one of the best orion pic with heaps of details i have ever seen (besides hubble ahem). Great shot Scott.
btw all, thanks for the tip with masking. i never kneww anything about masking. no wonder why my orion is so bright in the tram. in regards to masking, what is the ratio to the high exposure shot?
many thanks
Basically, EzyStyles, the short exposure is 2x1 min the long 2x10 mins to the ratio would be about 10 to 1, which seems to be enough to allow me to get all the detail from the brightest to the faintest without "clipping" that is burning any out.
There is an EXCELLENT article about this in the latest Aust. Sky & telescope I got just today. Its called Of Colour and Composition, by Tony hallas, starts on page 80. On page 81 he talks about clipping and the loss of detail it causes. I thoroughly recommend the article.
Scott
I'll tell you what frustrates me... I'm struggling on step 2 of the astrophotography business, but it is so easy to learn things like this masking tip... which must be on about step 17 I think... I hope I still remember it when I get to the point of being able to apply it!
with my head in planetary, it is great to take a breather and look at these fantastic images. I loved Houghy's in AS&T, Brad's APOD efforts, Hueys scorpio, ezy rapid rises.
Ok, I would have to say the DSO's are ruling the roost atm apart from Mikes Jupiter in the 12th!!!
.
, would adding say H alpha and maybe an OIII shots enhance it even more, or just distract a perfectly good image?
I actually tried imaging M42 with my 7 Nm Ha filter and it was disapointing, not as much detail as the colour UHCS image.
