Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
8 Likes  #1
PENTAX Astrophotography
Lens: DFA 24-70mm F2.8 Camera: K-1 ii 
Posted By: ayersliao, 04-15-2019, 07:53 AM

You may have heard of ď600 ruleĒ in astrophotography. It, although kind of too optimistic, is useful to determine the maximal safe length of exposure you can keep stars clear. 600 divided by the effective focal length is what you can keep star streaks unnoticeable. For a 300 mm lens, for example, to keep each exposure shorter than 2 seconds is recommended.
​For darker objects, stacking and an equatorial mount are usually required. Itís also bothersome to stack a pile of short-exposed RAW files. To make things easier, an equatorial mount is almost mandatory, even though it is not only heavy but costly.

PENTAX comes to save you, dude.
PENTAX leverages itís Shake Reduction (SR) System maximally. In addition to reducing moire and compiling 4 continuous photos by Pixelshift to enable super-resolution, it can also simulate an equatorial mount. Sure, it has exposure limitations compared to a real equatorial mount, but it truly enables PENTAX to top other competitors in terms of astrophotography.
In brief, the PENTAX astrotracer utilizes GPS and let the sensor move according to Earth rotation, making simulation of an equatorial mount possible.


The Milky Way, Jupiter, Saturn, and the tail of Scorpius.
55mm, F2.8, ISO 6400, 30s, single shot
PENTAX K-1 ii, DFA 24-70
With astrotracer
Taken in Nacpan beach, El Nido, Philippines.

Among high-end models of PENTAX, only K-1, K-1 ii, (FF) and K-3 ii (APS-C) are equipped with GPS. Other models should be paired with a small accessory called O-GPS1 mounted on the hot shoe. After turn on the GPS and astrotracer and calibrate, one can enjoy tracking stars. Donít forget to press the green bottom to shift B mode to astrotracer mode.
The camera will limit the maximal length of exposure according to the focal length. For example, a camera without astrotracer mounted with a 300 mm lens can go without star streaks in 1-2 seconds, but PENTAX makes it possible to shoot for up to 50 seconds in a single shot. For wide angle lenses, the limitation is up to 5 minutes. Now you can happily live without an equatorial mount, LOL.
Have you ever shoot galaxies with an ultra-wide lens? XD










More photos in El Nido, Philippines......


24mm, F2.8, ISO 12800, 20sec, single shot
PENTAX K-1 ii, DFA 24-70
With astrotracer
Nacpan beach



24mm, F2.8, ISO 3200, 30sec, single shot
PENTAX K-1 ii, DFA 24-70
With astrotracer
Nacpan beach


Carina Nebula (NGC 3372)
70mm, F3.5, ISO 1600, 20sec, single shot
PENTAX K-1 ii, DFA 24-70
With astrotracer
Lio beach


Orion Nebula M42
Stacked by DSS
PENTAX K-1 ii, DA 55-300 PLM
With astrotracer
Lio beach



Scorpius and The Milky Way
24mm, F3.2, ISO 1600, 30sec, single shot
PENTAX K-1 ii, DFA 24-70
With astrotracer
Lio beach

--
Blog
Facebook
Views: 307
6 Days Ago   #2
Otis Memorial Pentaxian
Loyal Site Supporter
RobG's Avatar

Join Date: Dec 2009
Location: Canberra
Photos: Gallery | Albums
Posts: 4,232
Wow! You've done really well. I haven't had nearly as much success with the astrotracer. How many images did you stack at what exposure for the one of the Orion nebula?
5 Days Ago   #3
Pentaxian




Join Date: Aug 2015
Photos: Gallery
Posts: 1,538
Nice set of images ayersliao...thanks for posting.
1 Day Ago   #4
New Member




Join Date: Feb 2017
Posts: 15
Original Poster
QuoteOriginally posted by RobG Quote
Wow! You've done really well. I haven't had nearly as much success with the astrotracer. How many images did you stack at what exposure for the one of the Orion nebula?
Thanks^^

300mm, F6.3, ISO 3200
6 pictures, totally 110 sec


Last edited by ayersliao; 23 Hours Ago at 09:54 AM.
1 Day Ago   #5
Loyal Site Supporter
Loyal Site Supporter




Join Date: Jan 2010
Location: Northern California
Photos: Gallery
Posts: 1,212
Fantastic series of photos! I have a K-3II but have never gotten into astro photography yet. However your work inspires me to do so.
19 Hours Ago   #6
Site Supporter
Site Supporter
Fries's Avatar

Join Date: Oct 2009
Location: Gauw
Photos: Gallery | Albums
Posts: 2,175
Really fantastic results!
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!
astrotracer, beach, camera, dfa, exposure, ii, iso, k-1, length, pentax, photo, shot
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax Q for astrophotography beginner? 2old4toys Pentax Q 60 04-13-2019 09:13 AM
Astrophotography + SMC Pentax-FA* 24mm F2 AL [IF] bnhoj Pentax SLR Lens Discussion 13 09-09-2018 01:33 PM
Trying Astrophotography with HD Pentax-DA 16-85mm f/3.5-5.6 ED DC WR MacLoz Pentax SLR Lens Discussion 5 07-20-2018 04:18 PM
Pentax 20mm f2.8A or Lawoa 15mm f4 for Astrophotography? stemked Pentax K-1 3 05-04-2017 07:49 PM
How to decide UWA lens for astrophotography, landscape, architecture, indoor? mln83 Pentax SLR Lens Discussion 12 04-25-2014 05:27 PM



All times are GMT -7. The time now is 09:28 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