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Foto Fair Post your photos for friendly, non-critical feedback. This is the place to show pictures if you aren't yet ready for full-blooded critique, or simply want to share an interesting picture with other e-group visitors.

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  #46  
Old 6th October 2016
birdboy birdboy is offline
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Re: Astro Photos

Hi Dave there looks to be significant detail in your M33. I would be interested to know which software you used to process it too. Since our last correspondence I have come across some very negative thinking about Dr Roger Clarks methods by the Astrophotography community. I have not got photoshop and LR curves does not seem to work that well for me. My processing currently consists of 60min exposures, about an hours worth, stacked in DSS and further processed in StarTools. I'll have a go at M33 when there are some clear skies and we can compare results. If you like send me your DSS stacked fits file and I'll see what Startools comes up with.
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  #47  
Old 6th October 2016
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Re: Astro Photos

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Originally Posted by birdboy View Post
Hi Dave there looks to be significant detail in your M33. I would be interested to know which software you used to process it too. Since our last correspondence I have come across some very negative thinking about Dr Roger Clarks methods by the Astrophotography community. I have not got photoshop and LR curves does not seem to work that well for me. My processing currently consists of 60min exposures, about an hours worth, stacked in DSS and further processed in StarTools. I'll have a go at M33 when there are some clear skies and we can compare results. If you like send me your DSS stacked fits file and I'll see what Startools comes up with.
I decided to purchase Pixinsight after trying it for free for 45 days. It is very powerful and can do some amazing things. So I used pixinsight and PS on my M33 shots after stacking them DSS. Levels and curves in PS are more sophisticated than in Lightroom and they certainly make a difference.

I saved my stacked file as a tif not a fits but I think it will still work in Startools I have just uploaded it to Dropbox so you can download it here.

****** Link Removed ******

Be very interested to see what StarTools can do so have fun, hope the download works not used dropbox in ages.

Why are the the astro community negative about Dr Roger Clarks methods I think his shots look great. Sometimes the "experts" go totally OTT about having perfectly round stars in the corner of the frame when to a "normal" viewer the detail in the nebula or galaxy are superb.

Interestingly I took another 12 x 5 min shots last night and tried adding them to the stack from 4/10/16 but at first look I think I have made it worse and lost detail.

One thing for certain PHD2 guiding makes a huge difference, last night it was tracking to +/- 0.25 to 0.5 pixel accuracy which is amazing, there was the odd blip to +/- 1px but still the stars are pretty round even after 5 minutes.
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  #48  
Old 6th October 2016
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Re: Astro Photos

Thanks Dave, tif do work in StarTools but the results are not the best that can be obtained. The tif file is 100mbytes smaller than the fits file and those that know ST have tested both and and found that the fits processed files show more definition. I had a go with your tiff file however and the first thing I noticed was that the file was quite well defined before any processing which would indicate to me that some processing had already taken place. StarTools works best from raw files stacked without any processing such as stretching or white balancing. I play a bit more before posting my result.

As for the negatively towards Dr Roger Clark see this link.
http://forum.startools.org/viewtopic.php?f=4&t=912

I do not know enough about the mathematics to understand who is right or wrong. I can only judge by the results and I still am very impressed with Clarkvision. I think this division is a real shame because I think StarTools and some of the DR Roger Clark methods can work together.
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  #49  
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Re: Astro Photos

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Originally Posted by birdboy View Post
Thanks Dave, tif do work in StarTools but the results are not the best that can be obtained. The tif file is 100mbytes smaller than the fits file and those that know ST have tested both and and found that the fits processed files show more definition. I had a go with your tiff file however and the first thing I noticed was that the file was quite well defined before any processing which would indicate to me that some processing had already taken place. StarTools works best from raw files stacked without any processing such as stretching or white balancing. I play a bit more before posting my result.

.
I did align the RGB channels in DSS before saving the TIF it does make the file show more definition .

I can run the same stack again with all the file formats changed to fits.
I will upload the resulting autosave fits without any intervention.

I will give it a go tomorrow and put on drop box. I didn't realise there was such a difference between fits and tif files.
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  #50  
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Re: Astro Photos

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Originally Posted by wornish View Post
I did align the RGB channels in DSS before saving the TIF it does make the file show more definition .

I can run the same stack again with all the file formats changed to fits.
I will upload the resulting autosave fits without any intervention.

I will give it a go tomorrow and put on drop box. I didn't realise there was such a difference between fits and tif files.
I am no expert on this and started about the same time as you but I have done a lot of learning and experimentation with StarTools. I could be talking BS so read my experiences with care. I am also interested to see what results can be obtained with other astrophotography software tools.

That does seem to explain the trouble I am having with StarTools with your image. The best results were when I loaded as a file that had been altered and not linear. This then attempts to reverse the stretch to allow tracking. I am also having a bit of trouble doing the deconvolution as the auto star mask is having trouble with the shape of your stars. I notice that the small stars are a bit elongated and the large stars a bit square but if I bin the data (scale/noise reduction 50%) I get better results although a smaller image.

Do not be alarmed if the fits file shows a less clear image than your tif file. StarTools prides itself on getting unaltered photons to show when processed though its algorithms.
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  #51  
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Re: Astro Photos

Forgot to mention that when using DSS it is important that the stacking paramenters show this.

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  #52  
Old 6th October 2016
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Re: Astro Photos

Just collected 30 + 1 min exposures of Andromeda and ended due to condensation But the images are slightly out of focus. Anyone nailed a method for focussing?

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  #53  
Old 7th October 2016
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Re: Astro Photos

Focussing is a real challenge.

Have you tried using a Bahtinov mask? They really do help and they are not expensive. You just put them in front of the lens while focussing and select an area around a fairly bright star and increase the magnification to maximum ( x14 on my em5) you get diffraction spikes around the stars when focus is spot on. Make sure you get the right adjustable size for your lens. DONT forget to take it off when taking pictures though like I did once.

I got mine from here.
http://www.ebay.co.uk/itm/High-Quali...item567f0037a4
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Re: Astro Photos

I have one for a 4 inch scope. I will see if l can rig that to the 40-1 50 Thanks

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  #55  
Old 7th October 2016
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Re: Astro Photos

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I have one for a 4 inch scope. I will see if l can rig that to the 40-1 50 Thanks

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Might work but I think the slits might be the wrong size for your lens.
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  #56  
Old 7th October 2016
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Re: Astro Photos

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Originally Posted by birdboy View Post
Forgot to mention that when using DSS it is important that the stacking paramenters show this.

Just saw this and checked mine they were not set like yours, DSS was doing things to the background and channels.
Anyway have reset mine to this.

Will pm you with a link to the new autosave.fts file when its uploaded on my very slow internet.
[IMG][/IMG]
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Re: Astro Photos

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Originally Posted by crimbo View Post
Just collected 30 + 1 min exposures of Andromeda and ended due to condensation But the images are slightly out of focus. Anyone nailed a method for focussing?

Sent from my Nexus 7 using Tapatalk
I use Manual, MF, Live View Boost, Manual Shooting, On2. I then use magnify and look for a reasonable bright star and then zoom in 14x and rotate focus ring until the star appears the smallest it can. A much more accurate method is to connect the camera via the USB lead and use Olympus Capture and drive the focus increments using the laptop focus buttons again using Live View Boost On2.
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Re: Astro Photos

Here is Dave's (Wornish's) M33 processed in StarTools.

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  #59  
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Re: Astro Photos

I do like the colours better than Pixinsight. You also did a better job on the stars.
I think I maybe sharpened my version a little more at the last step but it seems to me that both applications can do a great job in the right hands.

Post processing makes so much difference to astro photos.
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Old 7th October 2016
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Re: Astro Photos

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Originally Posted by wornish View Post
I do like the colours better than Pixinsight. You also did a better job on the stars.
I think I maybe sharpened my version a little more at the last step but it seems to me that both applications can do a great job in the right hands.

Post processing makes so much difference to astro photos.
Have you tried processing with Pixinsight on a stacked fits file (if that's possible) as I think all the specialist star processing tools work better on raw files that have not had any tweaking.

The greatest improvement I think we would get is when we can use our equipment under proper dark skies.
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