Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
09-06-2011, 06:16 PM   #46
Site Supporter

Join Date: Nov 2006
Location: Candiac, QC, Canada
Photos: Gallery
Posts: 337
A little experiment without the O-GPS1.

Hi. A few nights ago, I did a little experiment with only a Pentax 55-300mm lens with a doubler. The result was interesting but would have been better if I had used the GPS which I have ordered but not received yet. The parameters of the picture are ISO 3200, effective f9 and 3 seconds of exposure. The subject was Jupiter with 4 of its moons. There is some trailing because even 3 seconds is too much without guiding. Jupiter is overexposed because you don't see the moons otherwise since they are quite dim. I am in the process of getting a telescope which will make things more interesting. Comments welcomed.

Last edited by VE2CJW; 12-10-2012 at 01:09 PM.
09-09-2011, 05:58 PM   #47
Senior Member
Lex Madera's Avatar

Join Date: Apr 2011
Location: Virginia, Austria, Ukraine
Photos: Gallery
Posts: 188
moon from 20110909-comparison

I have a couple for comparison. #1 is the Pentax 18-135mm at 135. The second is the 50-300mm at 300. I tried a 3d shot with an optika 500mm with 2x teleconverter, but it came out so blurred it was aweful. I haven't mastered manual focus with it, yet.
Attached Images
09-21-2011, 07:15 AM - 1 Like   #48
New Member

Join Date: Aug 2011
Location: bundaberg
Posts: 2
Coonabarabran Observatory

These were taken at prime focus through a CDK20 Planewave telescope.
Exposure times were 2 to 3 minutes per photograph.
1.Comet Gerrad
2.Swan nebula
3.Dumbbell nebula
Attached Images
View Picture EXIF
PENTAX K-r  Photo 
View Picture EXIF
PENTAX K-r  Photo 
View Picture EXIF
PENTAX K-r  Photo 
09-22-2011, 07:42 PM   #49
Site Supporter
GerryJM's Avatar

Join Date: Mar 2011
Location: Toronto
Photos: Albums
Posts: 51
Focusing Aid - Bahtinov Mask

Has anyone used one of these focusing aids?

Kendrick Astro Instruments - Kwik Focus, off axis filter focus

07-24-2012, 12:16 AM   #50
Inactive Account

Join Date: Jul 2012
Location: Melbourne
Posts: 27
I've enjoyed reading the posts and seeing the pictures here... I'm just starting to get into astrophotography with my K-r, looking forward to learning new techniques.
07-24-2012, 01:20 AM   #51
Inactive Account

Join Date: Jul 2012
Location: Melbourne
Posts: 27
Southern Cross

This is one I took of the Southern Cross a couple of nights ago.
ISO 800, 10 second exposure, f/4.5
Attached Images
View Picture EXIF
PENTAX K-r  Photo 

  • 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!
bulb, camera, forum, hour, interval, k-r, kr, pentax k-r, thread
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Astrophotography iClick Pentax DSLR Discussion 1130 09-13-2017 11:05 AM
K-5 For Astrophotography Skymist Pentax K-5 1066 05-19-2017 10:44 AM
Astrophotography with Kr??? kooks Pentax K-r 5 04-23-2011 07:12 AM
Astrophotography Naturenut Troubleshooting and Beginner Help 4 09-09-2010 07:27 AM
K7 And Astrophotography Christopher M.W.T Pentax DSLR Discussion 49 11-25-2009 08:51 AM

All times are GMT -7. The time now is 11:11 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]