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Thread: How to capture elephant trunk?

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    Default How to capture elephant trunk?



    The other night I decided to take a shot at the elephant trunk nebula. I only took a bit over 20 mins worth of 30s subs. Apparently this isn't enough because after stacking and stretching, I can't see anything. How much integration time do I need for this target? Is it even possible without the HII filter (or whatever filter works for this one)?
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    Default Re: How to capture elephant trunk?

    It's a dim target to be sure, but should be doable with and 80mm APO and an unmodified DSLR, at 30s might be struggling though, but a lot of 2-3min exposures should show something.
    Without guiding by working on polar alignment and balance you should be able to get 2min, maybe 3m with a favourable target position in the sky.

    First question though, are you *definitely* pointing at it? Plate solve a sub at Astrometry.net
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    Default Re: How to capture elephant trunk?

    Quote Originally Posted by frant View Post
    It's a dim target to be sure, but should be doable with and 80mm APO and an unmodified DSLR, at 30s might be struggling though, but a lot of 2-3min exposures should show something.
    Without guiding by working on polar alignment and balance you should be able to get 2min, maybe 3m with a favourable target position in the sky.

    First question though, are you *definitely* pointing at it? Plate solve a sub at Astrometry.net
    I am actually still imaging with my newt. The APO hasn't arrived yet. And I definitely am pointing at the elephant trunk nebula. Got that 3 star cluster in the center frame. I can't take longer than 30 second subs at the moment due to a lack of an intervalometer.
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    Default Re: How to capture elephant trunk?

    Quote Originally Posted by mhorbacz View Post
    I can't take longer than 30 second subs at the moment due to a lack of an intervalometer.
    If you have a Radio Shack or equivalent nearby, you can make a simple manual trigger for a few bucks. Most DSLRs have a "dumb" trigger port. A micro stereo connector plugs into it, that you can wire to a switch. I made one with both a momentary pushbutton, for short exposures timed by the camera, and a toggle switch, for long exposures in Bulb mode. It was handy for when I was away from home and didn't want to bring my laptop, which is what I use as my intervalometer. Using it is really boring, but effective.

    You are shooting at f/7, unless you need a barlow for the camera, in which case, you are shooting at f/14. So 30 seconds is definitely not going to cut it. You are going to need 2-minute exposures, and lots of them. An hour minimum, and preferably more.
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    Default Re: How to capture elephant trunk?

    Quote Originally Posted by mhorbacz View Post
    I am actually still imaging with my newt. The APO hasn't arrived yet. And I definitely am pointing at the elephant trunk nebula. Got that 3 star cluster in the center frame. I can't take longer than 30 second subs at the moment due to a lack of an intervalometer.
    In that case then, as many 30s subs as you can stomach, seriously like several hundred. Whilst you make/get an intervalometer
    Btw what does the image you've got so far look like?
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    Default Re: How to capture elephant trunk?

    Elephants_trunk 300s sub.jpg
    Here is a 300 second sub taken last Sunday using a one shot colour camera.
    Light pollution filter only.
    C11 using Hyperstar at f/2
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    Default Re: How to capture elephant trunk?

    Quote Originally Posted by frant View Post
    In that case then, as many 30s subs as you can stomach, seriously like several hundred. Whilst you make/get an intervalometer
    Btw what does the image you've got so far look like?
    So far it looks like this.

    test.JPG

    Im thinking that it may be too zoomed in. And if that is the case then there isn't anything I can do about it until my ES80 arrives which should be very soon.
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    Default Re: How to capture elephant trunk?

    You are probably going to need to modify that Nikon. The detail in the Elephant Trunk is mostly in Ha. An unmodified camera needs a lot more exposure time to record it than an unmodified camera.

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    Default Re: How to capture elephant trunk?

    Quote Originally Posted by mhorbacz View Post
    So far it looks like this.



    Im thinking that it may be too zoomed in. And if that is the case then there isn't anything I can do about it until my ES80 arrives which should be very soon.
    At that scale the trunk isn't on your frame, it's above it. Compare with the example posted by Dave, reframing the shot almost exactly one sensor height 'above' should put it on the sensor.
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    Default Re: How to capture elephant trunk?

    Quote Originally Posted by frant View Post
    At that scale the trunk isn't on your frame, it's above it. Compare with the example posted by Dave, reframing the shot almost exactly one sensor height 'above' should put it on the sensor.
    Ah ok. I'll probably wait till my ES80 arrives. That should give me a wider angle shot.
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