someone knows how to defish pictures taken with this lens?
I have ptlens but I have weird results..
really thanks for any help!

I also bought PTlens. I have a falcon, non-metering, so PTlens doesn't know what fisheye I have. I select 'fisheye distortion' and select a value between 100 and 140.
The corners are a little weird and in a very low resolution. I didn't crop this use PT lens, I just chopped away the top and bottom using photoshop.
[https://www.flickr.com/photos/philippeflickruser/4204640498/]
[https://www.flickr.com/photos/philippeflickruser/4196569618/]
I think there is also another program where you use a plugin and photoshop. It's really good. But can't find the link.
Full auto and doesn't make the top/bottom weird. I'm googling it now.

I'm interested in your findings as well as to how to properly de-fish an image by this lens i.e. the parameters in PTlens. Thanks.

I think there are better programs then PTlens, not sure.
They key is to take a picture where the fisheye effect isn't distracting.

with this one, I only cropped the top, my legs weren't on the original picture. You can only see the fisheye effect when you look at the door.

www.imagetrendsinc.com/ITIASP/download/download.aspx
Download it . . . it's free. Plug-in or stand-alone.

Before..
After with PTLens and It's great for me and I did what philippwuestemburg did and works for me pretty much.

I use Hugin with 9mm setting

Hey Pirate!
Ive downloaded the software and it looks good. The only problem is that when i open photoshop lightrom and select 'file - Plug in manager - add - image trends - hemi- then when i click 'ok' an error comes up. 'an error occured while attempting to load this plug in'
when i solve this problem i'll buy the lens :/
oh, and i've even tried it with photoshop cs4

serial number?? T_T

:S dunno, but ill try another 1..

Did a defish in Lightroom 3 with the setting for a Nikon DX 10.5 mm fisheye. Look at the example just uploaded in the group. I think it works very well, and can be done with a preset in Lightroom.
Keimpe

With The Gimp, you can use the “Lens distortion” filter with the following parameters :
main : -100
borders : +50
zoom : -20
You will find some examples (though in french) of the result here :
zigazou.wordpress.com/2010/06/04/fisheye-samyang-8mm-sony...

One sample here
forums.dpreview.com/forums/readflat.asp?forum=1030&me...
I wouldn't expect DXO OP, PTlens, Adobe and Fisheye Hemi lens correction to work as intended without a specific profile, that is with the assumption that the image is from a more conventional fisheye.
Btw fisheye-hemi is designed to make faces near the edges look less distorted than usually with a fisheye - which is something the Samyang seems to do without correction, by the near-stereographic projection employed.
I assume Hugin should be useful; obviously it successfully produces VR panoramas with this lens; it optimizes lens distortion parameters automatically and it has several projections for the output. Can someone suggest a simple workflow for single image defishing and the lens parameters?

i didn't play with hugin long enough to get a successful output with the samyang lens. LR works but it produces a rectilinear projection which is stretched on the two sides.

Having read lots of adverse comments about PTLens defishing problems with this lens I expected to have to acquire some new software for defishing.
But to my surprise I found it possible to do a good defish to linear rectangularity using the adjustable fish eye distortion sliders in PTLens. Then the usual perspective adjustments can be added on top of that correction. The problem is that it's hard to see what needs to be corrected unless you have an image with plenty of rectangular straight lines so it's easy to see what's going on.
But you inevitably lose a lot of resolution at the edges if you do a complete linear defish. So I usually only do a partial defish, i.e. defish to taste. Which is why I didn't bother noting the parameters for a completely linear defish.

Having seen VR panoramas made with Hugin (free!) with this lens I think it should be capable of a perfect defish, plus a few different projections to play with. I understand there are different ways of defishing to taste... For example, some Fisheye-hemi samples (made with other fisheyes) look great, others so-so. This is why I'm interested in the projections.
If I understand correctly, PTLens and Hugin use the same lens model, but Hugin can optimize the lens parameters from a set of shots for a panorama by aligning matching points on pairs of images.

This is an example using Hugin

@Roberto, Here is your photo defished using Fisheye Hemi 2 (Full Frame filter) in Photoshop CS4.

@jswinden great!

I have used the program Hugin to defish. I have a tutorial here:
m43photo.blogspot.com/2012/03/defishing-fisheye-images.html

Hi, I created 2 scripts to defish the Samyang.They defish the photos using the panini method (straightens only the vertical lines) or the rectilinear method (straightens both vertical and horizontal lines). I used the defishing algorithms used in magic lantern. So if you use magic lantern, the defished image you see in your camera will be exactly the same image you will get with these scripts.
They are very simple to use.
First, download and install Hugin (hugin.sourceforge.net/download/).
Then open the batch file you want to use with the notepad and in the second line after the words 'set width=' replace the numbers with the width of your images, and in the third line after the words 'set height=' replace the numbers with the height of your images.
Then save the modified batch file and close the notepad.
Then put the batch file in the same directory of your photos and just run it, it wil defish all the images inside the directory.
Download link: www.mediafire.com/?h4qhxdnc3ta0lrz

Has anyone tried creating a lens profile for Adobe camera Raw using Adobe labs Lens Profile Creator?
I just had the targets printed and I am going to see what happens. I will post the results.

>Has anyone tried creating a lens profile for Adobe camera Raw using Adobe labs Lens Profile Creator?
forums.adobe.com/thread/666129
akry.livejournal.com/781417.html
Further interesting hacks with the Samyang 7.5mm mFT fisheye (not stereographic):
forums.dpreview.com/forums/readflat.asp?forum=1041&th...

2 Thumbs up on Hugin!
Thanks a million xxk89xx!!!
Your script is worth GOLD. After more than 3h of detective work I couldn't figure out which of the 10,000 tools that make up Hugin was responsible for changing he projection.
This gives me an invaluable tool for de-fishing video now.
More developments will be posted here: www.personal-view.com/talks/discussion/3373/any-7mm-lense...

wow just used xxk89xx method and am blown away both scripts yield there own version of straightening and both are awesome thanks so much for the info and sharing the scripts.
I feel now I have 3 new lenses the oh so curvey natural out of the box and the 2 script versions, just remember when you alter the scripts in notepad to save as all files types and not text. an ease and a breeze to use.
Cheers again xxk89xx

Photoshop CS6 Adaptive wide angle filter works great.
See my recent posts.

I used to own a Samyang 8mm f3.5, and now I own the Samyang 8mm f2.8 for Fujifilm X mount. The f2.8 mirrorless version is superior in every way, but that's another story to tell. :)
I wrote a little article on my blog about my experience with defishing here: nextimelah.blogspot.com/2013/11/samyang-8mm-f28-fisheye-l...
Hope this helps someone out there!

> The f2.8 mirrorless version is superior in every way
But it is not the stereographic kind and the equivalent FL is longer. Notice 'regular' fisheyes tend to be smaller than the 8/3.5.

Haven't seen anyone suggest PTGui to de-fish. The software is normally used to stitch multiple photos into a panorama, but it can also de-fish a single photo to a number of different projections. Real-time editor permits you to move image around to get the look you want. I understand PTGui is similar to Hugin.
See here: www.flickr.com/photos/65906562@N00/
Then scroll down to the three images of the porch: original, defished (not cropped), and defished (cropped).
The one of the porch and the International Space Station were taken using a Bower 8mm f/3.5. Both were de-fished using PTGui.

You can also use AnglerFish:
anglerfish.ajotte.com/
There is no profile for Samyang 8/3.5, but default settings (or Sigma 8mm) work very good.

@xxk89xx
Hi, just wanted so say a big thank you, I tried your scripts with Hugin and my Samyang 7.5mm 1:3.5 and they worked brilliantly.
Many thanks and kind regards
Leigh

@ xxk89xx
You are the best! It's because of smart and kind persons like you that makes our lives that much happier! :)
For old folks like me who still uses Windows XP, will need to download Hugin 2013.0.0, which still supports XP.
Also, on your batch files. For me, what works better is to rename from '*.bat' to '*.txt', then open using notepad program. Besides re-entering the width and heigth, also need to edit the Hugin program location to..
C:Program FilesHuginbinnona.exe
..then to save it, and then rename it back to '*.bat'.
Hope this will help people who are still using XP! :P
Cheers.

One thing about using 'xxk89xx' method, it works great, but it only outputs at 150dpi jpegs.
I found a way to rewrite his script, so the output will be 150dpi uncompressed TIFF.
Here are the scripts I've revised, copy and paste them to notepad and save as 'txt' file, then rename them to 'bat' files. Also remember to write in your own image file sizes, in my scripts I've input them as 1000x1000.
1. Panini JPG to TIF (for Windows Vista and above).
@echo off
set width=1000
set height=1000
mkdir panini
for /f %%a IN ('dir /b *.jpg') do (
echo Defishing %%a
echo p f16 w%width% h%height% v140 n'JPEG' >> defish.pto
echo o w%width% h%height% f2 v140 y0 p0 r0 n'%%a' >> defish.pto
echo m i0 >> defish.pto
'C:Program Files (x86)Huginbinnona.exe' -z nocompression -r ldr -e 0 -m TIFF_m -o panini/P_%%a defish.pto
del defish.pto)
2. Panini JPG to TIF (for Windows XP).
@echo off
set width=1000
set height=1000
mkdir panini
for /f %%a IN ('dir /b *.jpg') do (
echo Defishing %%a
echo p f16 w%width% h%height% v140 n'JPEG' >> defish.pto
echo o w%width% h%height% f2 v140 y0 p0 r0 n'%%a' >> defish.pto
echo m i0 >> defish.pto
'C:Program FilesHuginbinnona.exe' -z nocompression -r ldr -e 0 -m TIFF_m -o panini/P_%%a defish.pto
del defish.pto)
3. Panini TIF to TIF (for Windows Vista and above).
@echo off
set width=1000
set height=1000
mkdir panini
for /f %%a IN ('dir /b *.tif') do (
echo Defishing %%a
echo p f16 w%width% h%height% v140 n'TIFF' >> defish.pto
echo o w%width% h%height% f2 v140 y0 p0 r0 n'%%a' >> defish.pto
echo m i0 >> defish.pto
'C:Program Files (x86)Huginbinnona.exe' -z nocompression -r ldr -e 0 -m TIFF_m -o panini/P_%%a defish.pto
del defish.pto)
4. Panini TIF to TIF (for Windiws XP)
@echo off
set width=1000
set height=1000
mkdir panini
for /f %%a IN ('dir /b *.tif') do (
echo Defishing %%a
echo p f16 w%width% h%height% v140 n'TIFF' >> defish.pto
echo o w%width% h%height% f2 v140 y0 p0 r0 n'%%a' >> defish.pto
echo m i0 >> defish.pto
'C:Program FilesHuginbinnona.exe' -z nocompression -r ldr -e 0 -m TIFF_m -o panini/P_%%a defish.pto
del defish.pto)
Hope this will help anyone who may be interested!

I use DxO... I chose the distortion correction tool, defish option, and moved the slider until I got this, which started as an 8mm fisheye shot, which is super distorted:

Jonathan Hartzell / the Archangel:
Jonathan,
Thanks, I will give it a try!
Cheers, John