Ultra-Wide Angle and 4K - AVS Forum
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post #1 of 12 Old 07-23-2014, 07:15 PM - Thread Starter
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Ultra-Wide Angle and 4K

Ultra wide-angle lenses (fisheye) give you a view that is wider than your eyes. They permit showing panoramas, without the need to pan (and you all know how bad that is with RS...). They also permit interior shots where you have little room to stand back. And they create interesting distortions for subjects up close.

Such lenses have almost infinite dof, so low-resolution cameras cannot hide behind a lot of defocused area. A wide panorama that has low resolution really looks bad.

With 4K, one can really exploit uwa lenses. And that is what the Panasonic A500 has - a fisheye lens and 4K. You can also put a fisheye lens on a GH4 and get the same effects (at considerably more cost).

Here are two 4K videos that make use of the fisheye, for its panoramas and interesting distortions. The first is shot at the East River in NYC (boats, ships, helicopters, strollers).

https://vimeo.com/101403043


Here is an illustrative frame grab:





The second was shot at various parks in NYC. It has also has a few low-lit interior shots (at McDonalds, Starbucks, underground subway station). Both videos as a bonus have a time-lapse sequence as well.


The second video:


https://vimeo.com/101480011


Illustrative frame grabs:








Last edited by markr041; 07-23-2014 at 07:31 PM.
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post #2 of 12 Old 07-23-2014, 09:11 PM
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Quote:
Originally Posted by markr041 View Post
Ultra wide-angle lenses (fisheye) give you a view that is wider than your eyes. They permit showing panoramas, without the need to pan (and you all know how bad that is with RS...). They also permit interior shots where you have little room to stand back. And they create interesting distortions for subjects up close.

I am looking for ultra wide angle lens (fisheye) for the sony ax100. any suggestions or recommendation? tia


I look at this http://opteka.com/OPTSCFE.aspx. if I use 72mm on ax100 62mm. will it have any difference on fisheye view? tia

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post #3 of 12 Old 07-24-2014, 05:56 AM
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I just purchased the 7.5mm Rokinon for my GH4 that is the sharpest ultra-wide FE Lenstip ever tested.

Quote:
It’s obvious you don’t have to get verbose here. Already at the maximum relative aperture the lens exceeds the level of 75 lpmm and by f/4.0 it approaches 80 lpmm. What’s more, the edge of the frame looks equally great. At the maximum relative aperture we get the result of over 60 lpmm. I do not hesitate to write that, in the resolution category, it is the best fisheye lens I have tested so far.
http://www.lenstip.com/317.4-Lens_re...esolution.html

Here is a screen shot from a 4K UHD GH4 test video at close focus :
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post #4 of 12 Old 07-24-2014, 08:09 AM
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Nice pic, Joe. And thanks for starting this thread, Mark. This is part of the reason I buy camera bodies with interchangeable lenses - I used to hate screwing wide angle and telephoto "adapters" onto my old Super 8 cameras and camcorders to get the effects I wanted.

To me, it always made more sense (and gave me higher quality results) to just buy a fisheye, pull my standard lens off and mount the UWA lens directly to the camera.

I really like what you did with the Rokinon there, Joe. They're pretty inexpensive, too, at $249. I may have to pick one up

Cheers,

Bill
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post #5 of 12 Old 07-24-2014, 11:09 AM
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........ I may have to pick one up.
Me too! I used to have a 15mm for my old Nikon film cameras. It was great fun.

Bill
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post #6 of 12 Old 07-25-2014, 06:27 PM - Thread Starter
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UWA and 4K: The Charles River, Cambridge, MA

https://vimeo.com/101761811


Video frame grab:


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post #7 of 12 Old 07-25-2014, 07:17 PM
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That's a very detailed frame grab, Mark, that proves the HX-A500 is capable of outstanding video quality. Unfortunately many of the other clips are mediocre to poor. I'd really like to understand the conditions under which the HX-A500 produces such great video. Any insights?
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post #8 of 12 Old 07-25-2014, 07:43 PM - Thread Starter
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Quote:
Originally Posted by hatchback View Post
That's a very detailed frame grab, Mark, that proves the HX-A500 is capable of outstanding video quality. Unfortunately many of the other clips are mediocre to poor. I'd really like to understand the conditions under which the HX-A500 produces such great video. Any insights?

"Mediocre" and "poor" in what sense? Color? sharpness? exposure? curvature? what?
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post #9 of 12 Old 07-28-2014, 01:09 PM
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Originally Posted by markr041 View Post
"Mediocre" and "poor" in what sense? Color? sharpness? exposure? curvature? what?
Primarily lack of detail; they aren't resolving anywhere near 4k.
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post #10 of 12 Old 07-28-2014, 03:47 PM - Thread Starter
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Quote:
Originally Posted by hatchback View Post
Primarily lack of detail; they aren't resolving anywhere near 4k.
I don't know what you are referring to. How about tell us what frame in the Charles River video (give the time) you think is problematical. I will then post the frame grab to look at.
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post #11 of 12 Old 07-31-2014, 02:54 PM - Thread Starter
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UWA Video + 360-degree timelapse in 4K

East Rock Park is a high promontory that overlooks New Haven, CT and its harbor. It also has a tall monument. Perfect for uwa video. The video ends with a 360-degree time-lapse.


https://vimeo.com/102263979


Video frame grabs:






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post #12 of 12 Old 08-05-2014, 05:54 PM - Thread Starter
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Ultra wide-angle 4K at the Beach

Beaches are actually pretty boring (that's the point) - people sit mostly and enjoy the sun and the view. The ultra wide-angle is perfect for this setting:


https://vimeo.com/102671758


Two 4K frame grabs (the money shots):








Notice in the video something really amazing - autoexposure gets it just right. It's a good thing, because other than a manual back-light setting, auto is all you get. Contrast this performance with that of just about any consumer camcorder, which overexposes systematically (AX100, GH4, TM900, to name a few). Given the dynamic range, I could not improve upon the exposure if I could. This also holds for the indoor shots. This is seen (literally) in all of the videos I posted here. Indeed, I rejected no clips because of poor exposure, unlike for any camera I have used.
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