Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-29-2014, 05:37 AM   #16
Forum Member




Join Date: Aug 2014
Location: Ohio
Posts: 72
16mm F2 from Samyang/Rokinon/Pro-optic/Bower. Would that lens need an adapter to fit a k-50?

08-29-2014, 07:18 AM - 1 Like   #17
Senior Member




Join Date: Nov 2008
Location: Maine, USA
Photos: Gallery
Posts: 249
QuoteOriginally posted by when-daybreaks Quote
16mm F2 from Samyang/Rokinon/Pro-optic/Bower. Would that lens need an adapter to fit a k-50?
The Samyang and other versions fit like a Pentax A lens. It should fit fine and you will have automatic aperture as well. I use the Samyang 16 for astrophotography and you can check out more here, including one from last night.


https://www.flickr.com/photos/12598495@N08/sets/72157646579063277/
08-29-2014, 08:01 AM   #18
Forum Member




Join Date: Aug 2014
Location: Ohio
Posts: 72
QuoteOriginally posted by nightfly Quote
The Samyang and other versions fit like a Pentax A lens. It should fit fine and you will have automatic aperture as well. I use the Samyang 16 for astrophotography and you can check out more here, including one from last night.


https://www.flickr.com/photos/12598495@N08/sets/72157646579063277/
Wow your photos are amazing and exactly what I'd like to try my hand at. Would you say 16mm would be better than the 8-16mm
08-29-2014, 09:37 AM - 1 Like   #19
Senior Member




Join Date: Nov 2008
Location: Maine, USA
Photos: Gallery
Posts: 249
QuoteOriginally posted by when-daybreaks Quote
Wow your photos are amazing and exactly what I'd like to try my hand at. Would you say 16mm would be better than the 8-16mm

Not being familiar with the 8-16, I cannot comment other than to say a prime is generally better corrected and in this case also faster. DXOMark ranked it highly.

It is rather sharp wide open but vignetting can be a bother. At f/2.2 the vignette is tolerable and can be corrected in post, by f/2.8 it is virtually gone.

Focus is internal and it takes 77mm filters. Build quality is also very nice.

08-29-2014, 10:39 AM - 1 Like   #20
Junior Member
Khaj1t's Avatar

Join Date: Nov 2013
Location: Kaunas, Lithuania
Photos: Gallery
Posts: 32
Original Poster
QuoteOriginally posted by nightfly Quote
The Samyang and other versions fit like a Pentax A lens. It should fit fine and you will have automatic aperture as well. I use the Samyang 16 for astrophotography and you can check out more here, including one from last night.


https://www.flickr.com/photos/12598495@N08/sets/72157646579063277/
Great photos. How did you make those long exposures like 90 seconds without star trails? Did you use Pentax O-GPS1?
08-29-2014, 12:41 PM - 1 Like   #21
Senior Member




Join Date: Nov 2008
Location: Maine, USA
Photos: Gallery
Posts: 249
QuoteOriginally posted by Khaj1t Quote
Great photos. How did you make those long exposures like 90 seconds without star trails? Did you use Pentax O-GPS1?
I am interested in the O-GPS1 and hope to try one soon. That will make travel easier. I have been using an equatorially mounted telescope attached to a permanent pier. The camera rides "piggyback".

You can take a virtual tour of my roll off roof observatory here, the telescope, and the variety of cameras used.

https://www.flickr.com/photos/12598495@N08/sets/72157626760790621/

Taking images of the Milky Way from my home observatory lacks the variety of the scenic landscapes so often sought by photographers. For me, it is has always been about the Milky Way. But, I would like to try the O-GPS1 and move about.
08-29-2014, 01:28 PM   #22
Forum Member




Join Date: Aug 2014
Location: Ohio
Posts: 72
QuoteOriginally posted by civiletti Quote
Sigma 8-16
Do you have any other photos or ones of star trails that you used the 8-16mm ? I looked up the 16mm that baby's just not in my price range.
08-30-2014, 08:38 AM - 1 Like   #23
Veteran Member
NicoleC's Avatar

Join Date: Oct 2013
Location: Madison, AL
Posts: 448
I have the SMC Pentax-DA 15mm F4 ED AL Limited. I wouldn't call it sharp, and I have CA issues with it. I like having something this wide in my arsenal and it doesn't distort much at the corners, but I don't think I'd recommend it for astrophotography because of the CA.

08-30-2014, 10:23 AM   #24
Pentaxian




Join Date: Jul 2010
Location: Oregon
Photos: Albums
Posts: 1,427
QuoteOriginally posted by when-daybreaks Quote
Do you have any other photos or ones of star trails that you used the 8-16mm ? I looked up the 16mm that baby's just not in my price range.


The Sigma 8-16, if you can find one, costs more than the Samyang 16mm or the Samyang 14mm. the Samyang 8mm/3.5 can be found cheaper, though. Big glass elements are expensive.
08-30-2014, 11:43 AM   #25
Forum Member




Join Date: Aug 2014
Location: Ohio
Posts: 72
QuoteOriginally posted by civiletti Quote
The Sigma 8-16, if you can find one, costs more than the Samyang 16mm or the Samyang 14mm. the Samyang 8mm/3.5 can be found cheaper, though. Big glass elements are expensive.
Hmm yep .. I've been looking at too many lenses lol got them mixed up.
09-06-2014, 07:08 PM - 2 Likes   #26
Site Supporter
Site Supporter
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 10,151
The Sigma 18-35mm f/1.8 is an excellent choice for this kind of photography, coma is impressively well handled for starfield photography. Though Vignetting is problematic.



And with the above set up I was able to produce this:


Pentax K5IIs - Sigma 18-35mm f/1.8 @ 18mm f/1.8 ISO800 20s, Pentax O-GPS1 Astrotracer on. (slight crop)


100% center crop
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!
21mm, f3.2, f4, hd, k-mount, lenses, nightsky, pentax, pentax lens, pentax-da, slr lens, star
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
What is a good wide angle lens for night photography? MatBloodaxe Pentax SLR Lens Discussion 28 07-11-2013 08:36 AM
Ultra sharp wide angle for street and crowds Phillean Pentax SLR Lens Discussion 33 01-06-2013 05:32 AM
Wide angle lens for night sky photography? TopherTheME Pentax SLR Lens Discussion 10 04-17-2012 04:19 AM
Has anyone used the O-GPS1 for nightsky photography? CDW Pentax K-5 4 11-17-2011 03:15 AM



All times are GMT -7. The time now is 03:02 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