Astrophotography with GPS O-1 !

Started Sep 5, 2011 | Discussions
stephp
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Astrophotography with GPS O-1 !
Sep 5, 2011

Hardware: a K-5, a DA*200/2.8 wide-open, a (solid) tripod and the GPS O-1
Software: Astrotracer function, DeepSkyStacker & Lightroom
Photos: ISO 1600 & 45 seconds for each raw image
Location: 50km south of Paris
Conditions: Slightly hazy sky

The Great Andromeda galaxy (8 raw images stacked):

North America nebula (7 raw images stacked):

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MightyMike
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 5, 2011

Wow, impressive
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miles green
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 5, 2011

Stunning!!! Very very cool shots...
I wish I could do that with my 200mm!!

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Miles Green
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Bart Roskam
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 5, 2011

That is very neat! With what program did you stack the pictures?

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stephp
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Re: Astrophotography with GPS O-1 !
In reply to Bart Roskam, Sep 5, 2011

These images were stacked with DeepSkyStacker

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baldeagle21b
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 5, 2011

Excellent work, well done!

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uliw
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 5, 2011

Nice ones!

below a wide angle shot I just brought home from vaction. ISO 1600, f6.3, 241 sec exposure. I used the 10mm fisheye. Unfotunately, the lens is not very sharp. I also tried the 12-24mmm but than, the astrotracer can only correct for the stars in the center of the image.

cheers

Uli

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ozdean
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 5, 2011

That looks good.
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Colorado CJ
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 5, 2011

Wow, that's great! I wish they would make this backward compatible with the Kx, I'd buy it in a heartbeat. I've been looking for a tracking setup for my Kx, but everything I've found is just too expensive.

I wonder if Pentax will ever make this backward compatible, or if it's possible.

I might need to upgrade to a K5 sooner rather than later.

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blowfish23
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 6, 2011

Wow, these are definitely the best pictures I've seen yet with the gps unit.

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stephp
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Re: Astrophotography with GPS O-1 !
In reply to miles green, Sep 6, 2011

Of course you can !!
It's very easy. Thanks to Pentax
You just have to perform the precise calibration of the GPS unit.

miles green wrote:

Stunning!!! Very very cool shots...
I wish I could do that with my 200mm!!

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Miles Green
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Ishpuini
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 6, 2011

Great results!

Could you provide details on how you shot them?

Questions I have:

  • are these cropped or not?

  • did you reposition your camera for each shot in a stack?

  • why did you use as many as 7 or 8 45s exposures? whereas you could have done it in fewer exposures (at 200mm exposures up to 110-300s are possible depending on the declination).

  • why did you decide on ISO1600?

  • did you focus at infinite? (focus is critical since wide open aperture giving small depth of field)

Tx! Wim

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Belgium, GMT+1

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stephp
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Re: Astrophotography with GPS O-1 !
In reply to Ishpuini, Sep 6, 2011

Ishpuini wrote:

Great results!

thanks

Could you provide details on how you shot them?

Questions I have:

  • are these cropped or not?

yes for M31: from horizontal to vertical (roughly 1.5x magnification)
no crop for NGC7000

  • did you reposition your camera for each shot in a stack?

no, just perform precise calibration at sunset and put the camera on the tripod

  • why did you use as many as 7 or 8 45s exposures? whereas you could have done it in fewer exposures (at 200mm exposures up to 110-300s are possible depending on the declination).

In order to reduce the signal/noise ratio. Unfortunately, I was not able to get good results beyond 45s exposures.

  • why did you decide on ISO1600?

2 reasons:

  • up to 1600 ISO no in-camera raw noise reduction

  • light pollution is still present even at 50km from the big city (@12800 the sensor was completely saturated)

  • did you focus at infinite? (focus is critical since wide open aperture giving small depth of field)

Using the live-view function, indeed it's the most critical part of the process.

Tx! Wim

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Belgium, GMT+1

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Gmbal
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 6, 2011

Impressive, I was hoping that this kind of results would be possible now,and apparently it is. Well done.

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Ishpuini
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 6, 2011

Tx!! Great info.

Still not sure whether I should or should not get one... I love what it allows to do, but fear its use for travelling may not be ideal.

I mean, in order to get the coordinates onto my images, it needs to sit on the camera all the time, since putting it on and taking it off everytime I take the camera out of my bag or put it in again is something I won't keep up for three weeks or more. So in the end I will either have it on the camera in the bag too (space, risk of damage when bumping the bag while hiking), or not use it at all... What would you say?

The astrotracker function is secondary to me, even though it's fascinating of course.

Wim

stephp wrote:

Ishpuini wrote:

Great results!

thanks

Could you provide details on how you shot them?

Questions I have:

  • are these cropped or not?

yes for M31: from horizontal to vertical (roughly 1.5x magnification)
no crop for NGC7000

  • did you reposition your camera for each shot in a stack?

no, just perform precise calibration at sunset and put the camera on the tripod

  • why did you use as many as 7 or 8 45s exposures? whereas you could have done it in fewer exposures (at 200mm exposures up to 110-300s are possible depending on the declination).

In order to reduce the signal/noise ratio. Unfortunately, I was not able to get good results beyond 45s exposures.

  • why did you decide on ISO1600?

2 reasons:

  • up to 1600 ISO no in-camera raw noise reduction

  • light pollution is still present even at 50km from the big city (@12800 the sensor was completely saturated)

  • did you focus at infinite? (focus is critical since wide open aperture giving small depth of field)

Using the live-view function, indeed it's the most critical part of the process.

Tx! Wim

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Belgium, GMT+1

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Belgium, GMT+1

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Gmbal
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 6, 2011

Imagine that the light you caught started its voyage towards us some 2.5 million years ago and finally ended up inside your K5... That is some old light you got there.

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Jarda_Houdek
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 6, 2011

Great! I can't wait to get my O-GPS1. The andromeda galaxy is superb!
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stephp
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Re: Astrophotography with GPS O-1 !
In reply to Jarda_Houdek, Sep 6, 2011

Thanks

Jarda_Houdek wrote:

Great! I can't wait to get my O-GPS1. The andromeda galaxy is superb!
--

Through a Pentax Limited prime things may appear sharper than they actually are...
http://www.pentaxphotogallery.com/jaroslavhoudek

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stephp
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 26, 2011

One more: Messier 33, the Triangle Galaxy

stack of 40 images @ 60sec - 1600ISO - DA*200/2.8 stopped down to f/4

so so sky conditions: haziness, high light pollution, object at 25-35° above skyline
mag. limit ~ 16.0

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Gmbal
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Re: Astrophotography with GPS O-1 !
In reply to stephp, Sep 26, 2011

Amazing!

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