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Gerald
Joined: 25 Mar 2014
Posts: 1196
Location: Brazil
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 Posted: Thu Dec 24, 2015 9:01 pm Post subject: It's a fisheye, do you believe? |
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Gerald wrote:
Sigma XQ Fisheye 16mm F2.8 at F11, Sony A99V ISO 100, 1/320s
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If raindrops were perfect lenses, the rainbow did not exist. |
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fwcetus
Joined: 12 Jun 2015
Posts: 303
Location: New England
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| Posted: Thu Dec 24, 2015 9:35 pm Post subject: Re: It's a fisheye, do you believe? |
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fwcetus wrote:
| Gerald wrote: |
| It's a fisheye, do you believe? |
Yes, I do believe - 
A nice pic with nice colors -- you did a good job centering the horizon to keep it (almost) flat (IMHO).
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Fred
If you saw a fellow drowning, and you could either save him or photograph the event . . . What lens would you use ? |
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luisalegria
Joined: 07 Mar 2008
Posts: 6602
Location: San Francisco, USA
Expire: 2018-01-18
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| Posted: Thu Dec 24, 2015 9:52 pm Post subject: |
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luisalegria wrote:
Also, nice beach!
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I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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Oldhand
Joined: 01 Apr 2013
Posts: 6005
Location: Mid North Coast NSW - Australia
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| Posted: Thu Dec 24, 2015 10:27 pm Post subject: |
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Oldhand wrote:
A good result Gerald.
The lens produces some excellent IQ
Thanks
OH |
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Gerald
Joined: 25 Mar 2014
Posts: 1196
Location: Brazil
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| Posted: Thu Dec 24, 2015 10:56 pm Post subject: |
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Gerald wrote:
Thanks for the comments.
Yes, the "secret" is to center the horizon and ensure the long lines pass through the center of the image. If the other visual elements are small (houses, people, poles, etc.) the typical curvature of the lens fisheye goes unnoticed. By the way, the beach is in Cancun, Mexico.
For those who want to know how this Sigma lens performs, see the 100% crops below. The inevitable lateral CA of the angle ultra-wide lenses was eliminated by PP. The definition peaks at F5.6 in the center, and F11 at the edges.
100% crop - center:
100% crop - edge:
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WNG555
Joined: 18 Dec 2014
Posts: 784
Location: Arrid-Zone-A, USA
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| Posted: Thu Dec 24, 2015 11:52 pm Post subject: |
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WNG555 wrote:
Opening image is great. Nice job. Looks more UWA than fisheye.
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"The eyes are useless when the mind is blind."
Sony ILCE-6000, SELP1650, SEL1855, SEL55210, SEL5018. Sigma 19/30/60mm f2.8 EX DN Art.
Rokinon 8mm f3.5 Fish-Eye, 14mm f2.8 IF ED UMC. Samyang 12mm f2.8 ED AS NCS Fish-Eye.
And a bunch of Manual-Focus Lenses
My Flickr |
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Lloydy
Joined: 02 Sep 2009
Posts: 7794
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Fri Dec 25, 2015 12:08 am Post subject: |
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Lloydy wrote:
very impressive, I like that a lot.
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LENSES & CAMERAS FOR SALE.....
I have loads of stuff that I have to get rid of, if you see me commenting about something I have got and you want one, ask me.
My Flickr https://www.flickr.com/photos/mudplugga/
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http://www.ipernity.com/home/294337 |
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buerokratiehasser
Joined: 12 Jun 2011
Posts: 470
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| Posted: Fri Dec 25, 2015 8:33 am Post subject: |
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buerokratiehasser wrote:
dunno, haze maybe from f11?
Nice composition. |
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Gerald
Joined: 25 Mar 2014
Posts: 1196
Location: Brazil
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| Posted: Fri Dec 25, 2015 2:12 pm Post subject: |
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Gerald wrote:
WNG555, Lloydy and buerokratiehasser: 
Two other different interpretations of the same scene. In the first photo, the classic fisheye distortion is very evident. The balcony bar works, let's say, as a visual counterpoint to the curvature of the horizon. The bar was only a few centimeters from the lens but the bar surface details can still be seen due to the tremendous depth of field typical of fisheye lenses. It's a shame that there is nothing interesting on the lawn in the foreground ...
The second picture is the result of defishing, which effectively converts a fisheye into a rectilinear ultra wide-angle lens of about 10mm focal length. No doubt the defishing introduced some loss of quality at the edges, but this is not very important in this case.
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WNG555
Joined: 18 Dec 2014
Posts: 784
Location: Arrid-Zone-A, USA
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| Posted: Fri Dec 25, 2015 6:24 pm Post subject: |
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WNG555 wrote:
Gerald,
Very nice defishing results. What software did you use/could use to do that?
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"The eyes are useless when the mind is blind."
Sony ILCE-6000, SELP1650, SEL1855, SEL55210, SEL5018. Sigma 19/30/60mm f2.8 EX DN Art.
Rokinon 8mm f3.5 Fish-Eye, 14mm f2.8 IF ED UMC. Samyang 12mm f2.8 ED AS NCS Fish-Eye.
And a bunch of Manual-Focus Lenses
My Flickr |
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Gerald
Joined: 25 Mar 2014
Posts: 1196
Location: Brazil
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| Posted: Fri Dec 25, 2015 6:58 pm Post subject: |
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Gerald wrote:
| WNG555 wrote: |
Gerald,
Very nice defishing results. What software did you use/could use to do that? |
I've used PTLens, a nice and cheap program which has profiles for correcting barrel distortion and other aberrations of many new and old wide-angle lenses:
http://epaperpress.com/ptlens/
I suggest you take a look at the examples. You can also download a trial version which is good to process 10 images.
Speaking of defishing below the original and the defished versions of the same image:
ORIGINAL:
DEFISHED:
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