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Old 28-02-2021, 09:58 PM
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mswhin63 (Malcolm)
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Horsehead, please don't laugh :)

Hi All,

Just thought I would post this attempt at the Horsehead on my super inferior camera. Being an unmodded 450D camera I wasn't expecting miracles just more interested to see if can get anything at all. I tried the push the red more but it affected all the rest bring out a lot of greens. I really had to push the processing and I know it is well clipped but overall I am happy with the results.

I will be definitely re-looking at the method of taking flats.

I can get more nebulosity out of this but at the same time, I get a lot of unwanted artifacts.

156 Lights
40 Darks
40 Flats
40 Dark Flats
40 Bias

TS 80 / 492mm (Calculated the focal length using SiriL)
Canon 450D Unmodded
HEQ5
ASI120MM Guide Camera.
General finder scope modified to hold the guide scope.
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Old 28-02-2021, 10:19 PM
Saturnine (Jeff)
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That's not that bad an image , looks fairly smooth so the flats and darks are doing their job, though the blue stars need taming. You don't mention what the total exposure time was, more exp. time will capture more nebulosity, you probably know that already.
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Old 28-02-2021, 10:21 PM
RyanJones
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All together not a bad effort Malcolm. Well done. I stared my AP journey on an unmodded 350d until I was fortunate to acquire a modified one ( which I broke the modified my original one ) thereís nothing wrong with cutting your teeth on an early DSLR. Given youíre doing things with it that it was never designed to do, they cope pretty well and bring the wonders of the universe to you.

Cheers

Ryan
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Old 28-02-2021, 11:52 PM
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mswhin63 (Malcolm)
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Thanks all, I will be looking at re-processing it and consider reducing the blues. The total exposure time was just over 5 hours taken over 2 days with 2 minute exposures
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Old 01-03-2021, 01:34 AM
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billdan (Bill)
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That's a good result for a 450D that's not modded, the QE of those older cameras is about 40%, compared to the new CMOS cameras of 90% QE. You may have to add another 5hours to what you have to bring out more red (Ha signal)

I am curious as to why you took bias sub frames, when you also had dark flats. There is no requirement to take bias frames when you have dark flats, you do not want to subtract the bias twice from your light sub frames.
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Old 01-03-2021, 07:35 AM
Startrek (Martin)
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Malcolm
Great effort on a difficult target which for 3 reasons
1/ Using an old noisy low QE DSLR ( nothing wrong with using this camera , I used a 600D for 4 years unmodded)
2/ This target is quite low at the moment descending in the north west / west so you would be imaging through a fair bit of atmospheric instability
3/ Apart from being Ha dominant itís a very dim target too

Well done !!!
Martin
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Old 01-03-2021, 08:16 AM
glend (Glen)
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Malcolm, congratulations on your Horsehead image. Many of us started out with un-modded DSLRs (450D in my case).
I encourage you to consider a filter mod for your camera, to open it up to more Ha. The 450D is easy to work on, and the process for the filter mod is very clearly set out by Gary Honis on his website.

http://dslrmodifications.com/rebelmod450d1.html

Have fun.
Glen
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Old 01-03-2021, 10:19 AM
RugbyRene (Rene)
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I thin you've got a very good image there given the equipment you're using. a bit more practice and a better camera and you'll be producing some fine images.
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Old 04-03-2021, 10:38 PM
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mswhin63 (Malcolm)
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Thanks all for the kind words. I will be looking into another camera, possibly a mono. Just waiting for the budget to come through and the accountant (wifes) approval .

Interesting that a few more images may bring out the red. May give a go.

I will look into the bias frames, but I have already taken them and add then for the sake of it. Curious if this might be creating the banding in the image.

Currently looking at a different way of taking flats, using an LED light panel with a linear regulator and controller.
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Old 07-03-2021, 11:17 AM
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ChrisV (Chris)
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That's a great effort. I still reckon a bit of stretching will bring out more in your 5 hours worth. You should be able to selectively bring up the red.

I've got a 450d and it does a good job, even before I astro modded it. With all your calibration files you will get some great images that will challenge the cooled camera gang.

I agree with Glen. Gary Honis is your friend.
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Old 08-03-2021, 11:10 AM
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mswhin63 (Malcolm)
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Hi Chris, appreciate it, I usually do a lot of DIY'ing and still will look at Astro modding mine to get more oomph out of it. I though have little time available, so I am forgoing some DIY activities and just buy a dedicated Astro camera.

I will though still be improving my processing skills and as I learn new techniques, will apply that to some that I have already done. This image in particular was re-processed 3 times before showing it.
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