Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-26-2014, 04:33 AM - 1 Like   #796
Veteran Member
VisualDarkness's Avatar

Join Date: Nov 2011
Location: Uppsala, Sweden
Photos: Gallery
Posts: 4,440
One of my first shots with the O-GPS1 and I tried 180s and I'm impressed. Taken from a tall bird observation tower so we hade to be really still while we shot to not induce shake. You can see the uneven speed the different parts of the sky dance around at.

Pentax K-5
Pentax DA 14mm F2.8
Pentax O-GPS1 Astrotracer



04-26-2014, 06:07 AM   #797
Pentaxian
Tsuken's Avatar

Join Date: Oct 2013
Photos: Gallery
Posts: 1,483
QuoteOriginally posted by VisualDarkness Quote
One of my first shots with the O-GPS1 and I tried 180s and I'm impressed. Taken from a tall bird observation tower so we hade to be really still while we shot to not induce shake. You can see the uneven speed the different parts of the sky dance around at.



Pentax K-5

Pentax DA 14mm F2.8

Pentax O-GPS1 Astrotracer



I still find it amazing what that little thing can do.
04-26-2014, 06:30 AM   #798
Veteran Member
VisualDarkness's Avatar

Join Date: Nov 2011
Location: Uppsala, Sweden
Photos: Gallery
Posts: 4,440
QuoteOriginally posted by Tsuken Quote
I still find it amazing what that little thing can do.
Yeah, I first thought something was wrong when it told me that the max possible time for the setup was 5min! Apparently it was correct.
04-26-2014, 03:23 PM   #799
Pentaxian
Tsuken's Avatar

Join Date: Oct 2013
Photos: Gallery
Posts: 1,483
QuoteOriginally posted by VisualDarkness Quote
Yeah, I first thought something was wrong when it told me that the max possible time for the setup was 5min! Apparently it was correct.

Wow - five minutes? That's with the 14mm, I presume; it must alter that based on focal length.

I've done two minutes with my 135mm with no problem. Calibration is key though; I've also done one minute and been full of trails. ;-)

04-26-2014, 11:30 PM - 1 Like   #800
Site Supporter
smigol's Avatar

Join Date: Sep 2008
Location: Menlo Park, CA
Photos: Albums
Posts: 400
Whale and Hockey Stick Galaxies

Two nights at my nearby dark sky site Montebello Open Space Preserve earlier last week yielded some useful frames to make a small stack. The sky at this location is pretty dark depending on the cloud layer that can block out the city lights. Not the best night I've seen, but much better than at home.

Total of 15 subexposures for 5 hours of integration. Pentax K10D modified and cooled using Stellarvue SV4 scope.




Annotated shows the areas of interest and some background galaxies:

04-27-2014, 10:29 AM - 1 Like   #801
Forum Member
pesterle's Avatar

Join Date: Feb 2014
Location: Colorado Springs
Posts: 65
A couple more that I took back in March. Still working on the processing part of this stuff. :-/ I could probably stand to bring up the exposure on the summer triangle image, as it's a bit darker than the other.

Both at f/3.5, 120", 18mm, ISO800. Shot with a Pentax K-3, Sigma 18-250 lens, and the Astrotracer function.



signs of summer
by fingolfinPhoto, on Flickr


the northern milky way
by fingolfinPhoto, on Flickr
04-27-2014, 12:04 PM   #802
Pentaxian
MJSfoto1956's Avatar

Join Date: Dec 2013
Location: Boston
Posts: 1,287
I did this simple test: put a manual lens on my K-3 and told the camera respectively that it was a 50mm, 100mm, 200mm, and 400mm focal lengths. For each of the four focal lengths, I rotated the camera on the tripod aimed at the horizon to point to North, East, South, and West directions. I also repeated these four tests with the camera angled at 45 degrees. For each, I recorded the "Maximum Time" calculated by Astrotracer. What I found is that a 50mm lens (or less) it didn't matter where I pointed the camera: it always said "5 minutes". For the 400mm focal length the times dropped everywhere except pointing directly north at 45 degrees angle (note that I am located at 42 degrees North latitude), where it still recommended 5 minutes max! The lesson is that it is a combination of position in the sky AND focal length that ultimately determines what the max time is.

Michael
04-27-2014, 01:05 PM - 1 Like   #803
Pentaxian




Join Date: Apr 2007
Location: Sweden
Posts: 1,916
QuoteOriginally posted by MJSfoto1956 Quote
The lesson is that it is a combination of position in the sky AND focal length that ultimately determines what the max time is.
Good work. (one could also read the manual... )

04-27-2014, 03:05 PM   #804
Pentaxian
Tsuken's Avatar

Join Date: Oct 2013
Photos: Gallery
Posts: 1,483
QuoteOriginally posted by MJSfoto1956 Quote
I did this simple test: put a manual lens on my K-3 and told the camera respectively that it was a 50mm, 100mm, 200mm, and 400mm focal lengths. For each of the four focal lengths, I rotated the camera on the tripod aimed at the horizon to point to North, East, South, and West directions. I also repeated these four tests with the camera angled at 45 degrees. For each, I recorded the "Maximum Time" calculated by Astrotracer. What I found is that a 50mm lens (or less) it didn't matter where I pointed the camera: it always said "5 minutes". For the 400mm focal length the times dropped everywhere except pointing directly north at 45 degrees angle (note that I am located at 42 degrees North latitude), where it still recommended 5 minutes max! The lesson is that it is a combination of position in the sky AND focal length that ultimately determines what the max time is.

Michael

Good stuff. Nice and systematic
05-01-2014, 06:53 PM - 1 Like   #805
Pentaxian
Tsuken's Avatar

Join Date: Oct 2013
Photos: Gallery
Posts: 1,483
Last night was my first time with all three bits of kit I got originally with the goal of better Milky Way photos than I was getting with my Lumix G10. So, K-30, Sigma 30mm, and Astrotracer O-GPS1. (Also posted in the single in challenge yesterday):


Milky Way, Crux, and Coalsack by -Occasionally Focused-
05-01-2014, 07:43 PM   #806
Veteran Member
pixelsaurus's Avatar

Join Date: Jul 2007
Location: Levin, NZ
Photos: Gallery | Albums
Posts: 786
QuoteOriginally posted by Tsuken Quote
Last night was my first time with all three bits of kit I got originally with the goal of better Milky Way photos than I was getting with my Lumix G10. So, K-30, Sigma 30mm, and Astrotracer O-GPS1. (Also posted in the single in challenge yesterday):


Milky Way, Crux, and Coalsack by -Occasionally Focused-
Nice one. Where are you?
05-01-2014, 08:18 PM   #807
Veteran Member
VisualDarkness's Avatar

Join Date: Nov 2011
Location: Uppsala, Sweden
Photos: Gallery
Posts: 4,440
I envy your skills
05-01-2014, 09:11 PM   #808
Veteran Member
steve1307's Avatar

Join Date: Mar 2010
Location: Sydney
Photos: Gallery | Albums
Posts: 1,129
QuoteOriginally posted by pixelsaurus Quote
Nice one. Where are you?
Yes, very nice

Up in the fresh clear air and away form the city lights(and pollution) of Sydney - I guess.
05-02-2014, 06:18 AM   #809
Site Supporter
Stone G.'s Avatar

Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
QuoteOriginally posted by Tsuken Quote
Last night was my first time with all three bits of kit I got originally with the goal of better Milky Way photos....
Now, that's something of a start then. Congratulations!
05-02-2014, 01:18 PM   #810
Pentaxian
Tsuken's Avatar

Join Date: Oct 2013
Photos: Gallery
Posts: 1,483
Astrophotography

Thanks guys

QuoteOriginally posted by steve1307 Quote
Yes, very nice



Up in the fresh clear air and away form the city lights(and pollution) of Sydney - I guess.

Yep: lower Blue Mountains. There're too many street lights around for me, but even really close to home (like this, heading toward a fire trail) there are some pretty dark spots.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
astronomy, astrophotgraphy, astrophotograhy, bill, camera, dslr, dss, exposures, f/1.8, images, lens, light, lights, lp, moon, night, night sky, photography, pk tether, post, settings, sigma, skies, stars, starscape, street, thanks
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
astrophotography with K-7 - issues =(. Please help? Nass Photographic Technique 40 02-10-2010 10:28 PM
Astrophotography with K10 J-Rod Photographic Technique 5 12-12-2009 06:08 PM
Astrophotography mithrandir Photographic Technique 1 11-26-2009 06:56 PM
K7 And Astrophotography Christopher M.W.T Pentax DSLR Discussion 49 11-25-2009 08:51 AM
Astrophotography elLuiggi Post Your Photos! 0 11-01-2007 05:43 PM



All times are GMT -7. The time now is 09:42 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top