Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-09-2015, 09:59 AM   #16
Site Supporter
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 27,503
QuoteOriginally posted by dgacfr Quote
Hi everyone, I have been using pentax film and istDS cameras for casual photography for some time, and love Pentax cameras and lenses for its color and style, but have not dived deep into this, so my skills are rather mediocre. I recently found this this awesome website, hope I can improve my skills and make friends here.
Hi! Welcome to the Pentax Forums!

This is a (generally) friendly place and definitely one of your best resources for information about your Pentax camera and gear. Glad to have you here.


Steve

04-10-2015, 12:31 AM   #17
Site Supporter
Site Supporter
Stone G.'s Avatar

Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
QuoteOriginally posted by delboy65 Quote
Pentax K-r 18mm f5.6 ISO 1600 30 Sec Manfrotto Pixi mini tripod IR Remote release Monument Valiey, USA - Nov 2014

Thanks for sharing those photos delboy65. Actually, they are quite promising and, as I expected, your kit-lens isn't that 'hopeless' after all. Post-processing of a highly compressed image is always difficult, but here's a hint, what curves and levels can do to your images. Now, it is obvious that you have captured Orion to the lower right, the Hyades to the upper right of the centre and the Pleiades near the top middle of your photograph.


One important thing, though: I would never stop that lens down to f/5.6. At 18mm you get a very small physical aperture and you loose a lot of stars, because they are point-like sources of light and for such, your recording power depends upon the physical aperture only (and not the f-number). So next time, try out your lens at maximum aperture.


I can see that you have started a thread in the Astrophotography Club so maybe we can continue exchange of ideas there.
Attached Images
View Picture EXIF
PENTAX K-r  Photo 
04-10-2015, 04:07 AM   #18
Junior Member




Join Date: Apr 2015
Location: High Wycombe, UK
Posts: 35
Original Poster
Stone G... may I ask what, if anything, you did to the above pic as it looks brighter than the original I posted yesterday?
Thanks
04-10-2015, 06:09 AM - 1 Like   #19
Site Supporter
Site Supporter
Stone G.'s Avatar

Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
You can see some "basics" of astro image enhancements on my homepage here:


About Astrophotography - and Light Pollution (I)


It all boils down to, that for astroimaging you do need a decent digital image processing piece of software, where you can manipulate tonal ranges (curves and levels), white balance and noise. It doesn't have to be a very costly software such as PhotoShop - I used PhotoImpact X3 to manipulate your image.

04-12-2015, 12:28 PM   #20
Pentaxian
Aaron28's Avatar

Join Date: Jan 2015
Location: Huntsville, Al
Posts: 1,070
your examples with kit lens are ok....however I would choose the widest aperture to allow more light in......I currently use a sears 28/2.8 (15-20sec) at night and I like the results I get.......a 50mm can be used but with much shorter exposure times (roughly 8 sec).....no problem if you are goin for star trails but for a static star field the wider the better......the o-gps-1 is nice but a 28/2.8 for a 1/10th the cost is a good way to start!! good luck happy shooting!
04-12-2015, 11:13 PM   #21
Junior Member




Join Date: Apr 2015
Location: High Wycombe, UK
Posts: 35
Original Poster
QuoteOriginally posted by Aaron28 Quote
your examples with kit lens are ok....however I would choose the widest aperture to allow more light in......I currently use a sears 28/2.8 (15-20sec) at night and I like the results I get.......a 50mm can be used but with much shorter exposure times (roughly 8 sec).....no problem if you are goin for star trails but for a static star field the wider the better......the o-gps-1 is nice but a 28/2.8 for a 1/10th the cost is a good way to start!! good luck happy shooting!

Thank you Aaron, may i ask what ISO setting you use for those shutter times?
04-13-2015, 03:01 PM   #22
Pentaxian
Aaron28's Avatar

Join Date: Jan 2015
Location: Huntsville, Al
Posts: 1,070
with the 28/2.8 wide open I use ISO 200-400 typically whether I am using the K-r or K-50.....I would prolly use the same ISO if I use my sears 50/1.7 but have not with either pentax but have with my Olympus E-510.....usually I take a few test shots to see what I like best for a given night and frame of view.....then lock the camera down to begin the interval session approximately lasting 40 minutes +/- roughly 120/140 pictures which makes a nice 10-14 second time lapse and star trail composite......I would suggest trying the kit lens again at 18mm and the 3.5 aperture @ 800 ISO for 20-30sec and adjust exposure time and iso from there.....side note I generally set my WB to 3500-4000k or cloudy depending on the surrounding light pollution......I also suggest the use of starstaxx a program that will stack all the frames into a very nice star trail...it works sooo much better for me than DSS(deep sky stacker)
04-13-2015, 11:44 PM   #23
Junior Member




Join Date: Apr 2015
Location: High Wycombe, UK
Posts: 35
Original Poster
Went ahead and bought it. Can see the limitation onFOV, however am impressed with the performance in low light compared to the 18-55 kit zoom.
Took these of the ISS last night with my first night time outing with it.
Quite impressed as live in a very light polluted area.
Also took a lot of RAW+images after that of the sky that I will attempt to stack them this weekend

Attached Images
View Picture EXIF
PENTAX K-50  Photo 
View Picture EXIF
PENTAX K-50  Photo 

Last edited by delboy65; 04-13-2015 at 11:50 PM.
04-14-2015, 02:53 PM   #24
Pentaxian
Aaron28's Avatar

Join Date: Jan 2015
Location: Huntsville, Al
Posts: 1,070
cool! that things rips through the sky and very bright! neat ya caught it!
04-15-2015, 03:30 AM   #25
Site Supporter
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland.
Photos: Gallery | Albums
Posts: 6,306
Nice captures, ISS over-passes are pretty impressive, specially the longer ones.
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!
50mm, 50mm af f1.4, af, camera, f1.4, k-r, kit, night, pentax help, photography, sky, troubleshooting
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Pentax-F 50mm f1.4 AF (price reduced) gdneil Sold Items 16 01-03-2015 01:19 PM
Anothe uterly uneccessary comparison Pentax-F 50mm f1.4 and Sigma Ex dg 50mm f1.4 HSM Stavri Pentax SLR Lens Discussion 18 09-18-2014 12:53 PM
B&H: Sigma 50mm F1.4 EX DG HSM AF lens for Pentax $349 w/FS jogiba Pentax Price Watch 22 12-27-2013 03:12 PM
Pentax SMCP-FA 50mm f/1.4 AF or Rikenon P 50mm f1.7 (or 2) Bcrary3 Pentax SLR Lens Discussion 2 04-28-2013 09:58 AM
AF Adjustment for my K-7 and FA 50mm f1.4 Danny Delcambre Pentax SLR Lens Discussion 10 06-14-2010 12:19 AM



All times are GMT -7. The time now is 03:30 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