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12-12-2014, 08:55 AM   #736
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My first shots with O-GPS1. I don't know what it is, but was beautiful.

Pointing east.

1600 ISO • Pentax DA 55-300mm F4-5.8 ED • 61.81 sec

More wide.

1600 ISO • Pentax DA 21mm F3.2 AL Limited • 179.83 seconds

Where can I find a good star map on internet ?

12-12-2014, 09:30 AM   #737
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The Pleiades, M45.
12-12-2014, 11:30 AM   #738
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QuoteOriginally posted by interested_observer Quote
You are located near Helsinki Finland, if I am not mistaken, which is at 59 degrees North. So the GPS satellites fly up from the south, and essentially turn overhead and head back south again.
Over 60 degrees North But you are right. I don't have GPS satellites over my head or in the north. Glonass would be better for me or if I could rig my camera to use DGPS. I accused my tripod because it is not sturdy enough for my camera and 1 kg objective. At least wind caused some vibrations in long exposure shots. Or it might have been that sea ice I was standing on and moving around my camera while it was taking a picture.

Nice info and thanks for detailed answer!

QuoteOriginally posted by Gimbal Quote
The heading and the angle up/ down however has a large impact on the result. And the electronic compass is tricky, sometimes itís accurate, and sometimes itís not. The heading from the compass is also affected by the angle of the camera.

Stacking is the key to success.
I'm leaning on this. That electronic compass can sometimes be pain in the arse. I try to keep everything electrical or metallic (phones etc.) things as far as possible from the camera. I'm also thinking that my K5 electronic level indicator is little bit off (or my sensor is degree or two tilted). So if that error affects on headings with O-gps then I need to upgrade my system sometime. Now I will go with these and try stacking.

QuoteOriginally posted by fs999 Quote
Where can I find a good star map on internet ?
I'm using google sky map with my phone on site.
12-12-2014, 12:00 PM   #739
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QuoteOriginally posted by TedH42 Quote
The Pleiades, M45.
Thank you very much !

QuoteOriginally posted by ErZi Quote
I'm using google sky map with my phone on site.
Thank you ! I will have a look

12-12-2014, 01:32 PM   #740
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One thing I might try, sometime, is to first take the bearing to the target with an ordinary compass. Then aim the camera and mount a small and very weak magnet on top of the GPS, (or perhaps a strong magnet on a tripod nearby) and then rotate the magnet until the desired bearing shows on the display. I wonder what that will do with the accuracy.
12-15-2014, 06:48 AM   #741
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Hi FS999,

saw your post asking about star maps.

the best star map is astrometry.net

You load up your image and it plate solves for you.

Astrometry.net <- upload link

hope you don't mind I took the liberty of doing your two images

Astrometry.net <- your widefield

Astrometry.net <- you closeup

---------- Post added 12-15-14 at 08:08 AM ----------

Unless you are talking about in the field. Than I use SkEye app on my phone or Stellarium planetarium software (its free)
12-15-2014, 09:33 AM   #742
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Thank you seti_v2 ! Nice app !
12-15-2014, 03:10 PM - 1 Like   #743
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Pentax K5 DA 12-24, f4, ISO 6400, 30 sec exposure. The foreground is illuminated by a passing car. This is lake mattamuskeet, one of the darkest spots on the east coast of America. You can see the double cluster, the Andromeda Galaxy, and one of the many bright Geminid meteors that I saw on Saturday Night.



01-06-2015, 07:08 AM - 1 Like   #744
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An attempt at C/2014 Q2 Lovejoy with a K5, a 70mm limited and the O-GPS1. Unfortunately there was also a full moon at same time so details are washed out. The picture is a 100% crop of a stack of 29 exposures at 15sec each.
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01-07-2015, 08:56 AM   #745
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C/2014 Q2 (Lovejoy) Comet. First attempt at a comet. 28 x 120" guided exposures at ISO400 Pentax k5


Last edited by seti_v2; 01-08-2015 at 08:46 AM.
01-08-2015, 08:54 AM - 2 Likes   #746
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Comet C/2014 Q2 (Lovejoy) January 8. Near to close approach tonight. 14 x 30 seconds, 8" F4 Newtonian, Baader MPCC MKIII coma corrector, HEQ5 pro unguided, Pentax K-5.

Comet C/2014 Q2 (Lovejoy) January 8 2015 (Kevin) | AstroBin
01-08-2015, 10:05 AM   #747
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Very good. Like it.
01-17-2015, 12:09 AM   #748
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QuoteOriginally posted by JimmyDranox Quote
Very good. Like it.
Comet Lovejoy. Taken near Los Angeles. I subtracted the light pollution from the photo to get this shot. Used a Celestron 5i telescope and tracked the comet. The comet was not visible to the naked eye here, so I use the O-GPS-1 and my 40mm prime to spot the comet in relation to other stars and scanned the region with the telescope until I found it.
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PENTAX K-5  Photo 

Last edited by Eric Seavey; 01-17-2015 at 12:20 AM.
01-17-2015, 12:20 PM   #749
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QuoteOriginally posted by Eric Seavey Quote
Comet Lovejoy. Taken near Los Angeles. I subtracted the light pollution from the photo to get this shot. Used a Celestron 5i telescope and tracked the comet. The comet was not visible to the naked eye here, so I use the O-GPS-1 and my 40mm prime to spot the comet in relation to other stars and scanned the region with the telescope until I found it.
I also live near LA. Can you explain how you subtract the light pollution? What software do you use? I have Photoshop elements and Lightroom.
01-17-2015, 01:51 PM - 1 Like   #750
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You take a photo of the subject, and then you move the camera a little such that there are vey few stars in the frame. Then you unfocus the camera and take a photo. In photoshop you take the blurry image and add it as a layer and select difference to reduce the light pollution.
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