Astrophotography with GPS O-1 !

Started Sep 5, 2011 | Discussions
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stephp Forum Member • Posts: 52
Astrophotography with GPS O-1 !
4

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):

 stephp's gear list:stephp's gear list
Pentax K-5 IIs Pentax K20D Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM Pentax smc DA* 50-135mm F2.8 ED (IF) SDM Pentax smc DA* 200mm F2.8 ED (IF) SDM +8 more
MightyMike Forum Pro • Posts: 34,879
Re: Astrophotography with GPS O-1 !

Wow, impressive
--
Mike from Canada

"I am not a great photographer! God is a great creator! All I do is capture His creation with the tools He has provided me."

'I like to think so far outside the box that it would require a telephoto lens just to see the box!' ~ 'My Quote :)'

http://www.airliners.net/search/photo.search?sort_order=views%20DESC&first_this_page=0&page_limit=180&&emailsearch=mighty_mike88%40hotmail.com&thumbnails=

miles green
miles green Veteran Member • Posts: 5,314
Re: Astrophotography with GPS O-1 !

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

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Miles Green
Corfu

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Bart Roskam Regular Member • Posts: 460
Re: Astrophotography with GPS O-1 !

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

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stephp OP Forum Member • Posts: 52
Re: Astrophotography with GPS O-1 !

These images were stacked with DeepSkyStacker

 stephp's gear list:stephp's gear list
Pentax K-5 IIs Pentax K20D Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM Pentax smc DA* 50-135mm F2.8 ED (IF) SDM Pentax smc DA* 200mm F2.8 ED (IF) SDM +8 more
baldeagle21b Contributing Member • Posts: 912
Re: Astrophotography with GPS O-1 !

Excellent work, well done!

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uliw Regular Member • Posts: 261
Re: Astrophotography with GPS O-1 !

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
ozdean Forum Pro • Posts: 23,129
Re: Astrophotography with GPS O-1 !

That looks good.
--
Regards Dean - Capturing Creation
N.B. All my Images are Protected by Copyright

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Colorado CJ Regular Member • Posts: 487
Re: Astrophotography with GPS O-1 !

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.

blowfish23 Regular Member • Posts: 106
Re: Astrophotography with GPS O-1 !

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

stephp OP Forum Member • Posts: 52
Re: Astrophotography with GPS O-1 !

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!!

-- hide signature --

Miles Green
Corfu

 stephp's gear list:stephp's gear list
Pentax K-5 IIs Pentax K20D Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM Pentax smc DA* 50-135mm F2.8 ED (IF) SDM Pentax smc DA* 200mm F2.8 ED (IF) SDM +8 more
Ishpuini Veteran Member • Posts: 6,135
Re: Astrophotography with GPS O-1 !

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

 Ishpuini's gear list:Ishpuini's gear list
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stephp OP Forum Member • Posts: 52
Re: Astrophotography with GPS O-1 !
1

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

-- hide signature --

Belgium, GMT+1

 stephp's gear list:stephp's gear list
Pentax K-5 IIs Pentax K20D Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM Pentax smc DA* 50-135mm F2.8 ED (IF) SDM Pentax smc DA* 200mm F2.8 ED (IF) SDM +8 more
Gmbal Regular Member • Posts: 274
Re: Astrophotography with GPS O-1 !

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

Ishpuini Veteran Member • Posts: 6,135
Re: Astrophotography with GPS O-1 !

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

-- hide signature --

Belgium, GMT+1

-- hide signature --

Belgium, GMT+1

 Ishpuini's gear list:Ishpuini's gear list
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Gmbal Regular Member • Posts: 274
Re: Astrophotography with GPS O-1 !
1

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.

Jarda_Houdek Contributing Member • Posts: 812
Re: Astrophotography with GPS O-1 !

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 OP Forum Member • Posts: 52
Re: Astrophotography with GPS O-1 !

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

 stephp's gear list:stephp's gear list
Pentax K-5 IIs Pentax K20D Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM Pentax smc DA* 50-135mm F2.8 ED (IF) SDM Pentax smc DA* 200mm F2.8 ED (IF) SDM +8 more
stephp OP Forum Member • Posts: 52
Re: Astrophotography with GPS O-1 !

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

 stephp's gear list:stephp's gear list
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Gmbal Regular Member • Posts: 274
Re: Astrophotography with GPS O-1 !

Amazing!

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