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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
Thread started 20 Mar 2016 (Sunday) 15:56
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Rokinon 14mm for Night Skies?

 
KaosImagery
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Jul 28, 2016 07:07 as a reply to  @ post 18079826 |  #16

Some people use the Rokinon 24mm 1.4 and say it's great. Yes, it's not as wide but you could shoot a few images and stitch them to get the width.


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NickWell24
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Jul 28, 2016 08:02 as a reply to  @ KaosImagery's post |  #17

I've also heard the 35 1.4 is a good performer.


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TCampbell
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Jul 28, 2016 09:33 |  #18

corduroy wrote in post #18079826 (external link)
Hi All, what would be the next best lens over the Rokinon 14mm for milky way shots? I am trying to rent one for a star party and it's already reserved. Thanks!

Rental agencies that I'm aware of include BorrowLenses.com and LensRentals.com -- so you might be able to get one from an alternate source. There are certainly more sources (one of my in-town camera stores rents lenses.)

Barring that, you mostly want "low focal ratio" lenses. It turns out if you do the math, an f/1.4 lens collects four times more light (each 1 second that the shutter is open at f/1.4 you collect as much light as you do in having the shutter open for 4 seconds using an f/2.8 lens) -- so even though a 24mm f/1.4 isn't as "wide" and that means that if you aren't on a tracking head you can't expose as long, you'll actually still collect more light than you could with the 14mm.

If you have (or can rent) a tracking head... you can go much much longer.

Tracking heads include models such as:
- iOptron SkyTracker
- SkyWatcher Star-Adventurer
- Vixen Polarie
- AstroTrac
- Losmandy StarLapse

If your rental outfit has any of those devices (they all attach to standard photographic tripods -- preferably a nice beefy / solid tripod) then you can use longer lenses.




  
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airbuko
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Aug 15, 2016 13:27 |  #19

I use Samyang (European version of Rokinon) 14mm f/2.8 I do like it for night shots.

This is example

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hoorayswag
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Oct 27, 2016 19:51 |  #20

Rokinon 14mm is the best lens deal I've bought since the nifty 50




  
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WildImages
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Feb 02, 2017 09:05 |  #21

Whatever lens you get, use live view to focus at night. You can crank up the ISO, open live view at 10X, and critically focus. Then, turn down your ISO and go for it.

Critically focus on a star. Rock back and forth across focus to make sure you are spot on.

I recommend the 24 f1.4 for your night work. The true aperture of the 14mm f2.8 is roughly 3 (14/2.8). The true aperture of the 24 is roughly 17 (24/1.4). What this means is the 24 gathers (17/3)^2 or roughly 25 times more light than the 14mm lens which actually gathers about half the light of a human eye.

With the 24mm, you will see lots more stars with the same exposure time. Without tracking you can expose for approximately 10 seconds with the 24 without trailing. With the 14, about 16 seconds. This narrows the gap a bit, perhaps half, but the 24 still leads.

That is my input but YMMV. Good luck!




  
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repete7
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Feb 11, 2017 17:14 |  #22

WildImages wrote in post #18262480 (external link)
I recommend the 24 f1.4 for your night work. The true aperture of the 14mm f2.8 is roughly 3 (14/2.8). The true aperture of the 24 is roughly 17 (24/1.4). What this means is the 24 gathers (17/3)^2 or roughly 25 times more light than the 14mm lens which actually gathers about half the light of a human eye.

I hadn't heard of that before. Thanks for educating me. I have picked up a Samyang 14mm for cheap since posting this, but will put the 24 f/1.4 on my wish list.


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Canon 6D2|Canon Eos-m|Canon ef-m 22|Samyang 14mm f/2.8|Canon 40 stm|Canon 50 f/1.8 stm|Canon FD 50mm macro|Canon Macro 100L|Canon 16-35 f/4L IS USM |Canon 24-105L IS USM II|Canon 70-300 IS II USM|Canon 100-400L|

  
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curiousgeorge
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Feb 28, 2017 14:29 as a reply to  @ airbuko's post |  #23

Great shot, but interesting to note the coma effects in the upper corners, where the stars appear stretched. It's common for ultra wides, but I heard this lens handles it better than the Canon 14mm.


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johnsonjpj
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Mar 13, 2017 14:17 |  #24

I've used the 14mm and love it, although sometimes i wouldn't mind a zoom like 10-20, but I always figure I can just crop in post to get my desired composition.




  
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TomCruise06
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Sep 05, 2017 23:26 as a reply to  @ johnsonjpj's post |  #25

Can you guys please look at this thread and share your thoughts?

https://photography-on-the.net …/showthread.php​?t=1485983

Thanks for your time.




  
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Rokinon 14mm for Night Skies?
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