How to defish Samyang without LR or PS

Discussion in 'Native Lenses' started by Dangermouse, Oct 12, 2013.

  1. Dangermouse

    Dangermouse Mu-43 Rookie

    21
    Oct 20, 2010
    Hi,

    seem to have been drawn to images from this Samyang recently as I can't afford either the PL7-14 or Oly12 :-(

    I have to say I really don't like the fisheye effect but images that have been defished look great.

    I don't have lightroom or Photoshop etc, is there a free program that can defish or do I need to budget extra?

    Thanks,

    David
     
  2. Henk

    Henk Mu-43 Veteran

    211
    Aug 18, 2010
    the Netherlands
    You can try the Gimp and plug-in GimpLensfun, both are free as in gratis. I do not have any experience with it but found it after 2mins. of googeling :smile:

    Or for a little more money you could get the 14mm Samyang... no de-fishing required and I wouldn't be surprised if you end up with about the same angle after de-fishing the 8mm.
     
  3. dancat

    dancat Mu-43 Rookie

    20
    May 19, 2013
    I use Darktable for raw edit. It can also defish. And it is also completely free. I am not sure if it runs under Windows...

    Sent from my Nexus 7 using Mu-43 mobile app
     
  4. dougjgreen

    dougjgreen Mu-43 All-Pro

    Jun 5, 2013
    San Diego
    Doug Green
    Why would you get a 14mm Samyang for M4/3, when there's a perfectly good 14mm non-fisheye Panasonic lens that's faster, much cheaper, and FAR smaller, that's designed for the 4/3 frame.
     
  5. Dangermouse

    Dangermouse Mu-43 Rookie

    21
    Oct 20, 2010
    I already have the PL14 mm and there is no way that it has the same field of view as the Samyang.

    Maybe I need to splash out on Lightroom?
     
  6. dougjgreen

    dougjgreen Mu-43 All-Pro

    Jun 5, 2013
    San Diego
    Doug Green
    I was specifically referring to Henk's recommendation of getting the 14mm Samyang. Not the much wider Samyang that you are considering - you're exploring a reasonable idea - you were given a silly recommendation.
     
  7. Henk

    Henk Mu-43 Veteran

    211
    Aug 18, 2010
    the Netherlands
    thank you..
     
  8. pdk42

    pdk42 One of the "Eh?" team

    Jan 11, 2013
    Leamington Spa, UK
    Hugin does a good job too. DO some googling for how to use it to defish. There are some examples out there.
     
    • Like Like x 1
  9. byron92806

    byron92806 New to Mu-43

    5
    May 16, 2010
    Why defish?

    Why defish? That is the coolness of that lens.
     
  10. voltcontrol

    voltcontrol Mu-43 Regular

    133
    Apr 26, 2013
  11. Ian.

    Ian. Mu-43 All-Pro

    Mar 13, 2013
    Munich
    Ian
    Yes Hugin has a whole load of geometric and projection tools. Including panorama stitching. And it's free.
     
  12. Dangermouse

    Dangermouse Mu-43 Rookie

    21
    Oct 20, 2010
    Thanks, I've downloaded Hugin so presumably now I could defish a picture if I had one. I've tried taking something off the web to defish but could not get it in a readable format but I can safely go out and spend my £230 sure in the knowledge that it can be done, yes?
     
  13. Ian.

    Ian. Mu-43 All-Pro

    Mar 13, 2013
    Munich
    Ian
  14. Dangermouse

    Dangermouse Mu-43 Rookie

    21
    Oct 20, 2010
    thank you :)
     
  15. yehuda

    yehuda Mu-43 Veteran

    200
    Mar 14, 2013
    Not true. I defish my 7.5mm rokinon fisheye and the defished image is MUCH wider than my 12-35 @ 12mm. More like an 8-9mm lens.
     
  16. pdk42

    pdk42 One of the "Eh?" team

    Jan 11, 2013
    Leamington Spa, UK
    100% - done it lots of times. BUT - be prepared for quite a drop in resolution towards the corners after defishing - the defish projection spreads the image significantly. Here are some links to very fishy jpegs that you can download and play with. All with the Sammy 7.5:


    Fishy1

    Fishy2

    Fishy3

    Oh - 1 final thing. Don't forget to set the manual focal length on your IS configuration. I forgot at first and got some blurring.
     
  17. byron92806

    byron92806 New to Mu-43

    5
    May 16, 2010
    Try shooting the fisheye in 16:9!
     
  18. RevBob

    RevBob Super Moderator Subscribing Member

    Jun 4, 2011
    NorthWestern PA
    Bob
    It's a fun lens, easily de-fished in Hugin and cool even when not de-fished! :thumbup:
     
  19. Dave in Wales

    Dave in Wales Mu-43 All-Pro

    Nov 5, 2011
    West Wales