Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-21-2015, 02:47 AM   #1
Senior Member
malenisjaj's Avatar

Join Date: Dec 2013
Posts: 166
Astrophotography with samyang/rokinon 8mm f3.5?

Hi
I already have Samyang 16/2 (FOV about 90) but, somehow, I like spacious landscape astrophotography. I'm aware that is fisheye, but it's diagonal with good stereographic projection an FOV 180 on APS-C. If anyone use it for astrophotography, can you tell me how does it behave at f5.6? I read that it's soft at f3.5?
Thanks.


Last edited by malenisjaj; 04-21-2015 at 02:53 AM. Reason: Added FOV 180
04-21-2015, 05:29 AM   #2
Veteran Member




Join Date: Nov 2013
Posts: 385
I have used it for Milky Way shots in Death Valley and it was pretty good. I only used f3.5 though. 5.6 seems too slow from my experience.
04-21-2015, 05:36 AM   #3
Senior Member
malenisjaj's Avatar

Join Date: Dec 2013
Posts: 166
Original Poster
Thanks for the answer. I wonder if you can provide some pictures?

EDIT: Since aperture can be controlled via camera, what is the next aperture number after 3.5 for this lens?

Last edited by malenisjaj; 04-21-2015 at 06:18 AM.
04-21-2015, 06:52 AM   #4
Veteran Member




Join Date: Nov 2013
Posts: 385
QuoteOriginally posted by malenisjaj Quote
Thanks for the answer. I wonder if you can provide some pictures?

EDIT: Since aperture can be controlled via camera, what is the next aperture number after 3.5 for this lens?
I don't have the lens anymore but 4 is probably the next stop.

Here are two pictures from Death Valley. They were taken at 30secs/f3.5/ISO 6400. So you really don't want to go higher in aperture or you'll get even more noise. It was New Moon and very dark. Some moonlight probably would have helped with the foreground without overpowering the Milky Way. The last two were taken at Yosemite with moonlight (with a 15 2.8 lens). It helps with the foreground and you still can see the Milky Way.



04-21-2015, 08:29 AM   #5
Senior Member
malenisjaj's Avatar

Join Date: Dec 2013
Posts: 166
Original Poster
It really is noisy on the first two images. Did you try to low ISO at 3200 with longer exposure, like 60 sec (rule of 500)?
Last two images are gorgeous. I really need to go somewhere without light pollution to employ my Samyang 16/2.
04-21-2015, 10:44 AM   #6
Veteran Member




Join Date: Nov 2013
Posts: 385
60 seconds may result in star trails but with an 8mm it may just be OK. I am still a beginner so I don't know

If you did some experiments it would be great if you could post the results here.

You definitely have to go to a really dark place like Yosemite or Death Valley. It's so much fun doing night pictures there.
06-15-2015, 12:53 AM   #7
Senior Member
malenisjaj's Avatar

Join Date: Dec 2013
Posts: 166
Original Poster
Hi. I just wanted to update this thread because finally I bought Samyang UMC 8mm f3.5 (new model with detachable hood) and I'm thrilled with it. I'm sending you an image of Milky Way which was taken in a little place in Adriatic sea. As you can see, there is some light pollution from street lights and from little town on the coast, but even with them, galaxy is really visible. And, more interesting is that settings were ISO1600, F4 with exposition of 58s.

Edit: sorry, I forgot to mention that I edited (just a little) this image in Photoshop.
Attached Images
View Picture EXIF
PENTAX K-5 II  Photo 

Last edited by malenisjaj; 06-15-2015 at 01:32 AM.
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!
k-mount, pentax lens, samyang/rokinon 8mm, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Rokinon 8mm f3.5 Fisheye rosettaquarrier Sold Items 12 04-22-2015 06:12 PM
Rokinon 8mm F3.5 Ultra Wide Fisheye Lens $199 yunr Pentax Price Watch 9 04-01-2014 04:48 PM
Rokinon 8mm F3.5 for $199.95 VAE Pentax Price Watch 2 03-01-2014 08:20 AM
Samyang 8mm F3.5 + Pentax K1000 ? PipW Pentax SLR Lens Discussion 9 10-06-2013 07:03 AM
Rokinon FE8M-C 8mm F3.5 Fisheye Lens - ebay landerhoffis Pentax Price Watch 8 10-05-2013 09:47 AM



All times are GMT -7. The time now is 04:05 PM. | 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