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First Light 130 Triplet

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Well, sort of first light. After doing a 20 point model I tried 1 hour of 5 min Luminance subs of M33. Very rough process, bias only then 3 histogram stretches with gentle curves. Because of the LP I took the L subs through an Astronomik CLS-CCD filter.

Photoline test.png

I'm not sure about the focus though, as I rather rushed into taking the subs after doing the model without checking with a B-mask, in too much of a hurry to get an image. I could definitly do with taking Flats.

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If the focus is out then its only a tiny little bit, great image

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Thanks Jules. Imaging at just over 1" / pixel I may have been worrying too much about focus. I'll check the next clear night.

Now to get the Ha and RGB. Yeah, right!

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 Looks very promising Dave, is that the full FOV or cropped.

I didn't venture out last night as it was raining fire from the sky :grin:


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Hi Dave, yes it's the whoke frame, 910mm is giving me a very nice fl for framing.

It was raining fire here too, which is why I was concentrating on modeling. I tried a Ha but the MLPT went haywire so I spent the rest of the night doing an Autopoint model which gave me 40 points which I'll try to add to the 20 I already have.

I think from here my next 'scope is likely to be something in the 2m+ fl range, possibly  10" GSO RC, but not until I can move somewhere dark to make imaging galaxies really worthwhile.

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Very nice image

There seems to be a bit of tilt in focal plane? Stars in bottom left part of the image are bit out of focus.

Also interesting "feature" on one of the stars - big one on the top about 1/4 way from the left - looks like two jets coming out of it?

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Looks good to me Dave, I was just saying that conditions were not good last night and my stars also appeared bloated. Perfect image scale you have there.


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Looks pretty good. I do agree with the focus tilt though. There may be some slack in the focuses or imaging train  


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Argh! Focus tilt! Not the dreaded focus tilt!

Actually, there may be some in the Trius camera, which has a tilt plate built in. I've been meaning to dowmload a trial of CCD Inspector so this might be a good oportunity.

All the componants of the imaging train are screwed together, and the focuser was locked, both the pinion and the draw tube, which is 3.7" dia.

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I've just pulled the PNG into AstroArt on the main computer with its 27" monitor (I processed and posted from my laptop) and looking in the bottom left corner I see slightly radially elongated stars that look a bit comatic.

Oh dear, another job for the next clear night. Monday looks good so far.

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Well, I had another play with the data on the main machine. After the stack (Sigma, Bias only, Hot Pixel removal) I used the Gradient Removal tool, followed by two stretches with curves and a slight unsharp mask. Not sure if there's enough data yet to justify an unsharp mask, but what the heck.

Photoline trial 2nd process.png

Definitely need to take flats, as I can see some shadows that may be dust bunnies on the filter.

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Many thanks to all for the kind comments and pointers to a minor problem that I hadn't spotted.

Debating about Monday now. I really want to get some RGB data, and I may be able to get an hour of each if I start early enough, but there's the tilt to be sorted out, plus I'm not quite orthogonal to RA and Dec.

I *think* I may put this to bed with some additional data, then sort out the orthogonality and tilt and move on.

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