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01-17-2015, 02:29 PM   #751
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QuoteOriginally posted by Eric Seavey Quote
You take a photo of the subject, and then you move the camera a little such that there are vey few stars in the frame. Then you unfocus the camera and take a photo. In photoshop you take the blurry image and add it as a layer and select difference to reduce the light pollution.
Thanks! I'll try that tonight.

01-17-2015, 04:17 PM   #752
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QuoteOriginally posted by Eric Seavey Quote
You take a photo of the subject, and then you move the camera a little such that there are vey few stars in the frame. Then you unfocus the camera and take a photo. In photoshop you take the blurry image and add it as a layer and select difference to reduce the light pollution.
Very interesting.

I don't do astrophoto, but I have some friends who does. And two years ago, I thought if that something alike can be done, photographing the sky with a Sodium pass filter, and a Mercury pass filter, and than extracting the light pollution in Sodium and Mercury, exactly in the same way you did.

I didn't have those filters to try this, but I still think it can be done.
01-20-2015, 07:27 AM   #753
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Work In Progress. Horsehead Nebula (Barnard 33 in IC 434). Only got 7 x 1200" exposures before having difficulties. I plan on capturing much more data.

Celestron C8, 7nm H-alpha filter, modified Pentax k5 ISO800 all mounted and guided on NEQ6 mount.

01-21-2015, 09:18 AM - 1 Like   #754
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Completed my horsehead in HaRGB. 11x1200" in h-alpha and 13x120" in RGB

HaRGB


Just Ha


01-21-2015, 11:41 AM   #755
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Wonderful shots Seti ! HaRGB is my prefered.

How is it that the haRGB, with approx. 10x less light, has the same amount of details ?
01-21-2015, 05:52 PM   #756
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QuoteOriginally posted by fs999 Quote
Wonderful shots Seti ! HaRGB is my prefered.

How is it that the haRGB, with approx. 10x less light, has the same amount of details ?
You use the Ha image for luminance and combine it with the RGB data for color. So the HaRGB image has all data from ha and rgb
03-15-2015, 10:30 AM   #757
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Cannot let this thread drop of the first page of K5 so adding an album I am working on. I learned a new way to do post and trying it out with some photos I took last year at Mirror Lake Utah.

https://www.flickr.com/photos/24037406@N02/sets/72157651361815211/

All done on Pentax K5 with a Rokinon 14mm F2.8 Lens. All shots 30 seconds @ ISO 6400.
03-15-2015, 10:56 AM   #758
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QuoteOriginally posted by SirTomster Quote
Cannot let this thread drop of the first page of K5 so adding an album I am working on. I learned a new way to do post and trying it out with some photos I took last year at Mirror Lake Utah.

All done on Pentax K5 with a Rokinon 14mm F2.8 Lens. All shots 30 seconds @ ISO 6400.
Very nice! What PP software and/or technique?

03-15-2015, 11:07 AM   #759
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QuoteOriginally posted by gatorguy Quote
Very nice! What PP software and/or technique?
Photoshop and Adobe Camera Raw.

I did some basic edits in ACR then brought it into Photoshop. There I separated out the foreground and the background and applied curves. Just curves.

I learned it from a Photographer named Royce Bair. His blog is here: Into The Night Photography

He has a post on curves here; Into The Night Photography: View of the Milky Way with Your Naked Eye

I actually learned the steps by taking a class he had here in Salt Lake yesterday. He also has an ebook coming out in a month or so with the steps as well.
03-15-2015, 11:20 AM   #760
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Superb shots. Thanks for this link.
03-15-2015, 11:52 AM   #761
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QuoteOriginally posted by JimmyDranox Quote
Superb shots. Thanks for this link.
Thanks. I have some 11X14 & 12X18 prints being done @ Costco. Picking them up in the next hour. Excited and scared to see how they look printed. I never printed anything at these sizes but decided to try it with these shots.
03-16-2015, 08:42 PM - 1 Like   #762
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Orion Nebula, Pentax K-5, ISO 3200, 30 sec, DA 55-300mm at 300mm/
f 5.8 with Pentax O-GPS1 Astrotracer. You can see a bit of trailing, I got an even better calibration later on in the night, but then the clouds rolled in.
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03-17-2015, 08:18 AM   #763
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QuoteOriginally posted by y0chang Quote
Orion Nebula, Pentax K-5, ISO 3200, 30 sec, DA 55-300mm at 300mm/
f 5.8 with Pentax O-GPS1 Astrotracer. You can see a bit of trailing, I got an even better calibration later on in the night, but then the clouds rolled in.
Awesome. Wow I did not know you could get something like that without a telescope. Hmm I have the O-GPS1. I have a 150-500mm lens. I need to go play!
03-17-2015, 08:23 AM   #764
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Nice shot y0chang !
04-07-2015, 10:35 PM   #765
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I did a test shot of the M42 from my parking lot early this year. I will try again next year in a dark location.
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