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Full Frame fisheye lenses hdri 360 (Read 6243 times)
boogotti
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Full Frame fisheye lenses hdri 360
03/19/14 at 16:21:55
 
hi,
i have a full frame canon camera (6D), wondering what would be the best fisheye i can buy at a budget. features it must have.

-1. 180 field of view
-2. Auto focus

The only lens what comes to mind is sigma 8mm
and samyang but samyang doesnt have autofocus?
The Rokinon 8mm isnt fullframe. Any other lenses i should know about?

This lenses would be used for hdri so need it to be 180 so can create 360 environment

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Sam Rohn
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Re: Full Frame fisheye lenses hdri 360
Reply #1 - 03/19/14 at 18:29:43
 
autofocus is undesirable for shooting 360° panoramas which should always be shot with manual focus, typically at infinity, focusing per individual shot will likely cause stitching errors

samyang, rokinon and bower are all the same lens, get the newer version with removable lens hood and it is fine on full frame cameras

http://www.bhphotovideo.com/c/product/886556-REG/Rokinon_hd8m_c_8mm_f_3_5_HD_Fis...

sam
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« Last Edit: 03/20/14 at 17:00:38 by N/A »  
 
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boogotti
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Re: Full Frame fisheye lenses hdri 360
Reply #2 - 03/23/14 at 14:18:44
 
thanks sam,
just have two questions.

would you recommend having this lens shaved for extra fov?

Do you need autofocus for interior environments? e.g as in set lens to autofocus, set target distance then switch to manual focus?.

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Ian_
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Re: Full Frame fisheye lenses hdri 360
Reply #3 - 03/23/14 at 16:30:20
 
Well with the samyang lens, as Sam has mentioned, the newer ones have a removable hood, so you wouldn't need to shave it off.  If you're getting another lens without a removable hood with at least 8mm or less (10mm won't give you much more fov, but looks better since you don't have the hood in the image), then you can. I'm not sure if I would recommend doing it yourself, since obviously, there is some risk involved, but you can find tutorials on youtube. 

As far as autofocus goes, its not really needed much for wider angle lenses, like it is for longer focal lengths, especially telephoto lenses.  Especially if you have a higher aperture, changing the focus won't really change much.  I always keep my lens on manual focus, and keep it at infinity.  Having autofocus lenses are nice though, for reading exif with the aperture and focal length.  The newer rokinon lens, I believe does have a chip for reading those values.
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boogotti
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Re: Full Frame fisheye lenses hdri 360
Reply #4 - 03/24/14 at 13:15:08
 
Thanks Ian,
i have ordered the samyang  version 2 lens Smiley
how does the samyang lens compare to sigma 8mm in image quality are they about the same?
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Ian_
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Re: Full Frame fisheye lenses hdri 360
Reply #5 - 03/24/14 at 17:20:22
 
Well I never tried the sigma, I used to have the version 1 samyang, but sold it to buy a tokina 10-17.  Compared to the samyang, the tokina seems overall better in quality, but I mainly like it because the chromatic aberrations, vignetting, and lens flares are improved a lot.  As far as the sigma, from what I've read, its not that much better, especially the aberrations at the edges, but that's what you can expect from really wide angle fisheyes, especially with the 4.5mm sigma.
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boogotti
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Re: Full Frame fisheye lenses hdri 360
Reply #6 - 03/25/14 at 22:07:08
 
hey ian got my samyang version 2, testing it out.
one thing i dont understand is why isnt the image on my camera a full circle i have taken the lens hood off the lens. I have a  full frame camera. But the circle of the image is cut off the top and bottom. shouldnt this be a full circle?

is the sigma 8mm fisheye on a full frame is a full circle in the image?

or 4.5 sigma a full circle?
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Ian_
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Re: Full Frame fisheye lenses hdri 360
Reply #7 - 03/28/14 at 00:07:57
 
Well if you wanted a full image circle, I believe you need a full frame fisheye lens. I'm not sure which one you got, but from the rokinon description, it says its designed for cameras with APS-C image sensors. But it also says its compatible with full frame cameras. So yeah, I think you would have to get something like the sigma 8mm circular fisheye - http://www.amazon.com/Sigma-Circular-Fisheye-Canon-Cameras/dp/B000GE9SBM/ref=sr_...

You can buy the sigma, but remember, both will get the job done, and you have to decide if its worth more money, to be able to have the whole circle.  Unless you are using the lens for something else, the final result will be the panorama, so its not a big deal if you can't visually see the whole circle.  Also, I don't think you'll save on shots with the circle, since you'll still probably need an up and down shot.  I think you'd need the sigma 4.5mm to be able to shoot three images and cover the whole panorama. 

Also you have to consider the final output quality, and weigh speed (how many shots it takes) vs. quality (the final resolution of the panorama).  The more fov you fit into each shot, the less pixels you have to form your panorama.  So you have to decide what you're using the panoramas for, i.e IBLs, reflections, interactive tours, or print work.  That's why I personally decided to get a zoom fisheye, so I'm more flexible with what I can do with it.

Having said all of this, I don't want to tell you what you should buy, you have to decide what you want out of the lens and weigh its pros and cons.
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boogotti
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Re: Full Frame fisheye lenses hdri 360
Reply #8 - 03/28/14 at 16:28:23
 
Searching online, and seems like you can get 3 shots  + 1 floor, with a 8mm sigma but yes you take resolution hit.

Compared to the sigma 8mm you get more resolution from samyang (on full frame camera). But yes at the cost of 4 shots +1 floor. which i can live with Smiley

I think samyang is the right balance for me, as in more resolution than sigma at the cost of 4 shots + floor.

whats your take on this Ian?


Ian_ wrote on 03/28/14 at 00:07:57:
Well if you wanted a full image circle, I believe you need a full frame fisheye lens. I'm not sure which one you got, but from the rokinon description, it says its designed for cameras with APS-C image sensors. But it also says its compatible with full frame cameras. So yeah, I think you would have to get something like the sigma 8mm circular fisheye - http://www.amazon.com/Sigma-Circular-Fisheye-Canon-Cameras/dp/B000GE9SBM/ref=sr_...

You can buy the sigma, but remember, both will get the job done, and you have to decide if its worth more money, to be able to have the whole circle.  Unless you are using the lens for something else, the final result will be the panorama, so its not a big deal if you can't visually see the whole circle.  Also, I don't think you'll save on shots with the circle, since you'll still probably need an up and down shot.  I think you'd need the sigma 4.5mm to be able to shoot three images and cover the whole panorama. 

Also you have to consider the final output quality, and weigh speed (how many shots it takes) vs. quality (the final resolution of the panorama).  The more fov you fit into each shot, the less pixels you have to form your panorama.  So you have to decide what you're using the panoramas for, i.e IBLs, reflections, interactive tours, or print work.  That's why I personally decided to get a zoom fisheye, so I'm more flexible with what I can do with it.

Having said all of this, I don't want to tell you what you should buy, you have to decide what you want out of the lens and weigh its pros and cons.

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Ian_
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Re: Full Frame fisheye lenses hdri 360
Reply #9 - 03/29/14 at 00:00:26
 
Yeah I figured you might end up needing an extra shot horizontally, than with a fully circular lens in portrait. You mainly need a down shot or two to mask out the tripod.  Depending on what kind of tripod head you have that's not a big deal.  I have a nodal ninja with the nadir adapter, but if you have a head that only rotates horizontally, then you need to take the down shot handheld or rig something up. 

You also have to consider that having more images with more overlap gives you better quality overall, since you don't have to interpolate and grab as much information from the edges of your image, where your image is softer and any chromatic aberrations are the most extreme.  That's why when I had the samyang on my cropped canon 500d, I took 4 horizontal + 1 up + 3 down, for masking.  I eventually decided to take 6 horizontally for even better quality, which didn't slow down the process that much.

Overall, I would say that the samyang is a good starter lens, so I think you made a good decision. Its a good competitor to more expensive lenses, especially since its being updated once in a while.  It'd be interesting to see what they would improve on, in a third version.  You can always sell the lens later on, and put the money towards a better lens.  I got over $100 for the first version at a local camera shop.  If you do end up going with a sigma later on, I would probably go with the 8-16mm, since it gives you more flexibility and I think its only $50 more than the 8mm. Who knows, maybe in the future, sigma will make a 4-16mm fisheye, which would be crazy.
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