Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-11-2015, 12:44 PM   #1
Forum Member




Join Date: Jun 2015
Location: Dortmund
Posts: 58
LR/PS Profile Samyang/Walimex 8mm

Hi everyone,

I am not sure if this forum section is right for my question, so maybe if it is wrong one of the admins can push it.

I have a Walimex Pro 8mm f3.5 (same as Samyang 8mm) prime lens and I am looking for a Lightroom profile to defish my pictures.
I' ve found some profiles online, but most of them were taken with Canon/Nikon DSLR.
So, if you have a profile of a Pentax + 8mm combination (I have a K30) please let me know.
I tried to create my own profile, but failed
Results are more or less crap

At the moment I am trying the Nikon/Canon profiles, some results are okay, but I think with Pentax they will be evene better

Phil

06-11-2015, 01:37 PM   #2
Pentaxian
mgvh's Avatar

Join Date: Sep 2010
Location: MD
Photos: Gallery | Albums
Posts: 952
I'm chiming in her to see if anyone else comes up with anything. I have the Rokinon 8mm, so the same lens. In LR, I'm using the Canon Samyang 8mm Fisheye profile. Works fairly well, but I've probably used manual lens correction more often.
06-11-2015, 03:36 PM   #3
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 42,007
QuoteOriginally posted by pentaphil Quote
I am looking for a Lightroom profile to defish my pictures.
I have not attempted to use LR for the purpose, but I can recommend PTLens. I have it configured as a pass-through editor from LR and it does a good job.

PTLens Home Page


Steve

(...has the Rokinon/Samyang 8mm and can't understand why the need or desire to defish...different strokes for different folks...)
06-12-2015, 03:48 AM - 1 Like   #4
Site Supporter
Site Supporter
narual's Avatar

Join Date: Jun 2013
Location: South Bend (Notre Dame), Indiana
Photos: Gallery
Posts: 1,982
I feel like I'm posting this way too often, but here it is again:

Lightroom won't do what you want. The closest match is probably the Sigma 15mm fisheye profile, and it's not very good.

Take a look at FisheyeHemi. It does a truly amazing job with the 8mm fisheye.

Image Trends - Fisheye-Hemi Plug-In - Corrects Fisheye Lens Distortion and retains Image Content Details

I just redid my original example to get rid of the watermarks and put the before/during/after shots into a single image. The middle one makes it easy to see how little of the original image you actually lose.

I didn't include LR's best attempt in that file, but I have it as a separate file, which I'll also include.

It's not a great photo. I don't use the lens indoors much (because I just haven't done much indoor photography of places rather than people lately), but it's much easier to see the improvement in an indoor shot with lots of straight lines.

Not sure if you can click through on these to full size versions. Usually I'd post on Flickr, but it seems to be offline for me.

Attached Images
 
View Picture EXIF
PENTAX K-5  Photo 
06-12-2015, 06:06 AM   #5
Forum Member




Join Date: Jun 2015
Location: Dortmund
Posts: 58
Original Poster
Thank you I will have a closer look to this tool
06-12-2015, 06:33 AM   #6
Site Supporter
Site Supporter
narual's Avatar

Join Date: Jun 2013
Location: South Bend (Notre Dame), Indiana
Photos: Gallery
Posts: 1,982
There are instructions for using it here: The Best Method of Defishing a Fisheye Photo – Lonely Speck

The short version is -- get it looking the way you want in Lightroom, then edit a copy in photoshop. For the best results, you'll need to run it twice. It only runs along the longest dimension, so you need to modify the canvas size a couple times, and then crop the results down.

There are 3 versions of the plugin - circular, full, and cropped. You'll want to use full, because the 8mm lens is designed for a crop sensor camera, so it's effectively full. If you were using it on a full frame camera, you'd just get a circle, and would need to use circular. (If you used it on 4/3 with an adapter, you'd use cropped).
06-12-2015, 06:44 AM   #7
Forum Member




Join Date: Jun 2015
Location: Dortmund
Posts: 58
Original Poster
QuoteOriginally posted by narual Quote
There are instructions for using it here: The Best Method of Defishing a Fisheye Photo Lonely Speck

The short version is -- get it looking the way you want in Lightroom, then edit a copy in photoshop. For the best results, you'll need to run it twice. It only runs along the longest dimension, so you need to modify the canvas size a couple times, and then crop the results down.

There are 3 versions of the plugin - circular, full, and cropped. You'll want to use full, because the 8mm lens is designed for a crop sensor camera, so it's effectively full. If you were using it on a full frame camera, you'd just get a circle, and would need to use circular. (If you used it on 4/3 with an adapter, you'd use cropped).
Thanks, I've read this article in the morning ;-) But I think I was really tired, because I didn't remember anything about fisheye hemi I will read it again now

06-12-2015, 08:02 AM   #8
Site Supporter
Site Supporter
narual's Avatar

Join Date: Jun 2013
Location: South Bend (Notre Dame), Indiana
Photos: Gallery
Posts: 1,982
just realized - the reason the walls aren't perfectly straight (I think they were when I did the same shot with the demo version) is that I thought it would be a good idea to add a little extra width to the canvas at the same time I added height. The extra width made the curve correction a touch less pronounced. Don't do what I did.
06-14-2015, 05:38 PM   #9
Veteran Member
kh1234567890's Avatar

Join Date: Sep 2010
Location: Manchester, UK
Photos: Gallery
Posts: 2,653
QuoteOriginally posted by pentaphil Quote
At the moment I am trying the Nikon/Canon profiles, some results are okay, but I think with Pentax they will be evene better
The usual rough-and-ready way is to use the Sigma DG 8mm profile in ACR and tweak the correction about to about 70
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
8mm, defish, k-mount, lens profile corrections, lightroom, pentax, pentax k30, pentax lens, profile, profiles, results, samyang 8mm f3.5, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Unable to use embedded profile in LR - 645Z Primus Pentax Medium Format 8 04-07-2015 03:38 AM
How to Update 28-45mm Lens Profile in ACR/PS CS6 Ryan Tischer Pentax Medium Format 5 03-16-2015 09:52 AM
samyang 8mm won't focus anymore guus giesbergen Troubleshooting and Beginner Help 6 07-20-2013 12:39 PM
File Size After LR or PS Deiberson Digital Processing, Software, and Printing 9 11-11-2011 12:46 PM
LR 2 Camera Calibration Profile RollsUp Digital Processing, Software, and Printing 5 02-15-2009 05:37 PM



All times are GMT -7. The time now is 06:58 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top