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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 03 Jan 2011 (Monday) 21:32
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Stacking help. Advice for a beginner?

 
rpmaurer
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Jan 03, 2011 21:32 |  #1

Hello everyone,
I am very new to astrophotography. (Is that what its called?) Any suggestions on some good subjects to capture images of to stack for beginners. Heres one i did pointed straight up. Perhaps Orion or its belt? The Big Dipper? IF so any recommendations on settings and number of captures? I tried Jupiter but it (DSS) will only stack one image.


Thanks! Ryan


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Jan 04, 2011 08:48 |  #2

Can you give us a little more information about what you did like the number of images you took and your exif data? And as far as what you captured I'm not sure if I see Orion or the big dipper but up near the top that small cluster of blue stars is the Pleiades star cluster or M45.


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tkerr
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Jan 04, 2011 11:34 |  #3

That's Perseus Near the middle slightly to the left. with Camelopardalis, Auriga on the right, and Taurus with the Pleiades closer to the top.
DSS is not designed to stack lunar or planetary images, for that you will want to use Registax (external link).

Providing some imaging stats would help. I.e. exposure and how many exposures.

Capturing the image data is the first step in producing and astroimage/astrophoto. Stacking is the second step, and the post processing the image stack is the final step.

Once you have stacked the images with DSS you need to save it to a 16bit Tiff, and then load it into Photoshop or similar image processing software to continue with the post processing to adjust and balance the color and illumination levels and tones, as well as any other processing that might be necessary, i.e. noise reduction, gradient removal etc.

CS5 has the new HDR Pro and Faux HDR which will allow you to load the 32 bit Autosave.tif file produced by DSS. But you will be limited to the adjustments you can make before having to convert it down to 16 bit.


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Casper ­ Smit
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Jan 04, 2011 12:24 |  #4

this my take on it

https://photography-on-the.net …hp?p=11502450&p​ostcount=9

hope it helps


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rpmaurer
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Jan 04, 2011 13:37 |  #5

that was just a random picture with the camera pointed straight up, umm sorry Im new to photography kinda, exif data?


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rpmaurer
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Jan 04, 2011 14:21 |  #6

ISO 400, f4.5, 24mm, 15s shutter, 20 exposures


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tkerr
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Jan 05, 2011 10:13 |  #7

rpmaurer wrote in post #11572487 (external link)
ISO 400, f4.5, 24mm, 15s shutter, 20 exposures

Increase that ISO to 800 and see how that does. If that looks good you can even try higher. I've used as high as 1250 and it still look presentable. Beyond that is just too noisy.
At that focal length you can decrease your shutter speed to 20 second before picking up on star drift. You can probably push that to 25 seconds if you're going to reduce the size of the entire uncropped image to 1024 or smaller.
If your lens has a wider aperture than f/4.5 use that instead.


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Stacking help. Advice for a beginner?
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