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Thread: safe haven for tiny formats

  1. #13211

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    Re: safe haven for tiny formats

    There shouldn't be much star movement at 15 seconds... It is more likely Coma towards the corners of the lens that is exacerbated by processing - especially since shot wide open.
    Quote Originally Posted by Randy Moe View Post
    A very beautiful image.

    Do you think raising the ISO 4 stops which would shorten exposure 4 stops would have lessened the star movement?

    Would that have significantly affected your capture?

    I understand time was short. Just looking for more process.
    ~nicholas
    lifeofstawa
    stawastawa at gmail

  2. #13212

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    Re: safe haven for tiny formats

    Quote Originally Posted by Randy Moe View Post
    A very beautiful image.

    Do you think raising the ISO 4 stops which would shorten exposure 4 stops would have lessened the star movement?

    Would that have significantly affected your capture?

    I understand time was short. Just looking for more process.

    I took multiple images of the scene, with different ISOs set, up to 6400. I found the files with ISO 400 were the most malleable. Increasing the ISO caused the Kilauea glow to lose detail and blow out. At ISO 400, the Milk Way and stars were dim, but I was able to increase exposure on those areas without adding any more noise than had it been shot at a higher ISO. Ultimately, balancing the cloud glow vs. the night sky was the most difficult part.

    With such a high megapixel camera, even at 15 seconds, there is a bit of star movement. As was mentioned, there is definitely some coma in the corners from the lens being shot wide open. If I had more time, I might have played around with some shorter exposures, but I worry that the noise might have increased too much. Because of the cloud movement, and short window of opportunity, it wasn't a good candidate for stacking techniques. Also, I am definitely not an expert at astrophotography. This was really my first attempt in good, non light polluted conditions.

    If I had another crack at it, I might try a 10-second exposure with the same settings. I am convinced though, that there is no advantage to using a higher ISO than 400 on the D850. I was able to recover the exposure in post with the same noise as shooting natively at higher ISOs, with the advantage of having more usable dynamic range.

  3. #13213

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    Re: safe haven for tiny formats

    Quote Originally Posted by stawastawa View Post
    There shouldn't be much star movement at 15 seconds... It is more likely Coma towards the corners of the lens that is exacerbated by processing - especially since shot wide open.
    If you look at the stars in the center, there is some movement, but not much. It is more noticeable on the dimmer stars. There is definitely coma in the corners, but it is better than my old 20mm f/2.8 AIS that I had been using.

    Once I print it, I will have a better idea of how much movement is really noticeable. I'm hoping to get a nice 19-inch (A3+) print.

  4. #13214
    Randy Moe's Avatar
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    Re: safe haven for tiny formats

    Thank you for your detailed reply.

  5. #13215
    Scott Schroeder's Avatar
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    Re: safe haven for tiny formats

    Canon 5D, Supertak 50, PS












  6. #13216
    David Lobato David Lobato's Avatar
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    Feb 2011
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    Re: safe haven for tiny formats

    Little Gunpowder Falls this morning. Sony A7II.

    [img]A7208832 by blazingshutters, on Flickr[/img]


    [img]A7208837 by blazingshutters, on Flickr[/img]

  7. #13217

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    Re: safe haven for tiny formats


    Tulip, April 2018

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