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Thread started 29 Jul 2010 (Thursday) 01:36
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Samyang Rokinon Vivitar 14 2.8 lens

 
Intheswamp
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Feb 28, 2017 18:28 |  #4786

oximuis wrote in post #18288219 (external link)
Cannot focus to save my life with this lens... please help!!! :-)

Depends on what you're shooting...

If regular landscape then tighten your aperture up...get it up around f10 or smaller...focus at maybe 6-feet. Images should be pretty sharp with that. Don't let your shutter speed drop too low in chasing a deep dof...for tack-sharp images raise the ISO or use a tripod so your ss doesn't get down too low.

At 14mm, f10, mounted on a crop camera and focusing at 6' according to http://www.dofmaster.c​om/dofjs.html (external link) then everything from 2.16' to infinity should be in focus.

Ed


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View_Finder
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Feb 28, 2017 20:27 |  #4787

smallick wrote in post #18288223 (external link)
Use live view and zoom into the area you want to focus on.

This.

Do it wide open. Then set your aperture/shutter speed for what you want to achieve.


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Feb 28, 2017 21:02 |  #4788

smallick wrote in post #18288223 (external link)
Use live view and zoom into the area you want to focus on.

I can't believe how long it took me to figure out to do this


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oximuis
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Feb 28, 2017 22:01 |  #4789

smallick wrote in post #18288223 (external link)
Use live view and zoom into the area you want to focus on.

Thank you... is your infinity mark accurate?


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RhodyPhotos
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Post edited over 1 year ago by RhodyPhotos. (2 edits in all)
     
Feb 28, 2017 23:50 |  #4790

oximuis wrote in post #18288429 (external link)
Thank you... is your infinity mark accurate?


No, it is off by a little bit. I focused for infinity once and made a mark with a sharpie, so now i just set aperture to f/11 or f/16, set the focus ring to the sharpie mark and shoot away. Nothing i shoot with this lens has a shutter speed of less than 15 secs anyways. Its a grest bang for your buck lens.

And shoot in manual mode, adjusting the shutter speed and/or ISO to get desired exposure. For night shots i might even have to use bulb mode to avoid using a very high ISO.


CC always welcome.

  
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Tareq
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Mar 01, 2017 02:13 |  #4791

And i love my Sony A7r because when i try to manually focusing it zooms in so i can micro focus it for best result, it is only zooming in the center of the finder, but you can use cursor to move wherever you want to be focused, i do that with my Canon TS lenses which are manual, so Samyang also will be the same.


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oximuis
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Mar 08, 2017 02:02 |  #4792

Thank you :-)


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RhodyPhotos
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Mar 15, 2017 07:36 |  #4793

Found a new use for this lens, pet portraits :)


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Slightly cropped to eliminate my feet, forgot how wide this lens is.

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oximuis
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Mar 19, 2017 01:17 |  #4794

Pain in the a*s butt I like it.


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merida
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Mar 22, 2017 20:22 |  #4795


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Post edited over 1 year ago by Scatterbrained.
     
Mar 22, 2017 20:51 |  #4796

IMAGE: https://c1.staticflickr.com/3/2935/32722978334_6107f1087b_b.jpg
IMAGE LINK: https://flic.kr/p/RRBP​pC  (external link) Barker Dam at Twilight (external link) by tltichy (external link), on Flickr

IMAGE: https://c1.staticflickr.com/3/2870/33415352742_345176078e_b.jpg
IMAGE LINK: https://flic.kr/p/SUNq​cq  (external link) Rocks at Barker Dam (external link) by tltichy (external link), on Flickr

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Mar 22, 2017 21:27 |  #4797

oximuis wrote in post #18288219 (external link)
Cannot focus to save my life with this lens... please help!!! :-)

Focus a 14mm lens? Why? Set it to f/5.6-8, focus at 4' and duct tape the lens. You can shoot this lens for a week and never touch the focus. The entire point of a UWA lens is DOF. Focusing wastes most of that. Stop it! :)




  
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oximuis
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Mar 24, 2017 10:16 |  #4798

gjl711 wrote in post #16309553 (external link)
These type of images are always hard to assess sharpness. Try shooting a resolution chart (external link), manually focus, and compare the real numbers. Then try the same thing with AF. It might be truly soft but it might be just mis-focusing a bit as well.

Bassat wrote in post #18308384 (external link)
Focus a 14mm lens? Why? Set it to f/5.6-8, focus at 4' and duct tape the lens. You can shoot this lens for a week and never touch the focus. The entire point of a UWA lens is DOF. Focusing wastes most of that. Stop it! :)

That's if your focus ring is dead on... Since my infinity is WAY off I'm going to assume that my 4 is not your 4 but thanks for you advise :-)


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Bassat
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Mar 24, 2017 11:37 as a reply to  @ oximuis's post |  #4799

You misunderstand my point. Google 'hyperfocal distance'. There is only on the very rare occasion any need at all to focus a 14mm lens. The entire point of such a lens is DOF. You seem to be missing the point.




  
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Mar 24, 2017 12:03 |  #4800

Bassat wrote in post #18309650 (external link)
You misunderstand my point. Google 'hyperfocal distance'. There is only on the very rare occasion any need at all to focus a 14mm lens. The entire point of such a lens is DOF. You seem to be missing the point.

It can be hard to tell if you're focusing on something at "hyperfocal" distance when the distance scale is crap and you're out it the woods without a tape measure. I have the same issue with my lens. If I focus on the ground in front of my feet and then stop it down to f/5.6 everything is in focus, but if I'm at f/2.8 trying to find hyperfocal can be finicky. I tried just last night and couldn't get it. Theoretically it should be just under 3 feet, and yet. . . . . .


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Samyang Rokinon Vivitar 14 2.8 lens
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