Fisheye-Hemi (Page 2): I have a Nikon 16mm f2.8 for full frame and a Samyang 8mm f3.5 for crop frame. Both cover the frame. Your is, I believe, a full circular fisheye.

kymarto Loc: Portland OR and Milan Italy

elliott937 wrote:

Where did you learn all of this? Next question, what specific lens are you using, for which it is a 'full frame fisheye', and not a 'full circle fisheye'? I don't know if this tells you anything, but I recently bought a Sigma 8mm Fisheye. Now that I'm learning that there are more forms of fisheye, I'm suspecting mine is full circle fisheye?

I have a Nikon 16mm f2.8 for full frame and a Samyang 8mm f3.5 for crop frame. Both cover the frame. Your is, I believe, a full circular fisheye.

kymarto Loc: Portland OR and Milan Italy

Actually “circular" and "full frame" are the proper terms. "Full frame" is a bit misleading since digital days with crop sensors, as it does not mean a fisheye for full frame sensor.

elliott937 Loc: St. Louis

I'm learning, but ever so slowly. I can't believe that I can teach college physics, and it's a piece of cake. But, come Fisheye 8mm, and it all seems like a foreign language. So I got out the paperwork on my lens, the Sigma 8mm F3.5 EX DG, followed by "Circular Fisheye". Does this tell you more of what I'm working with here?

I'm just hoping that I can use this lens, with my Canon 5DII, and capture a superwide image without the bending. Unrealistic?

JD750 Loc: SoCal

elliott937 wrote:

I'm learning, but ever so slowly. I can't believe that I can teach college physics, and it's a piece of cake. But, come Fisheye 8mm, and it all seems like a foreign language. So I got out the paperwork on my lens, the Sigma 8mm F3.5 EX DG, followed by "Circular Fisheye". Does this tell you more of what I'm working with here?

I'm just hoping that I can use this lens, with my Canon 5DII, and capture a superwide image without the bending. Unrealistic?

Post a pic here maybe someone will recognize it?

elliott937 Loc: St. Louis

Here is an image I captured this morning.

JD750 Loc: SoCal

elliott937 wrote:

Here is an image I captured this morning.

That's cool!

kymarto Loc: Portland OR and Milan Italy

elliott937 wrote:

I'm learning, but ever so slowly. I can't believe that I can teach college physics, and it's a piece of cake. But, come Fisheye 8mm, and it all seems like a foreign language. So I got out the paperwork on my lens, the Sigma 8mm F3.5 EX DG, followed by "Circular Fisheye". Does this tell you more of what I'm working with here?

I'm just hoping that I can use this lens, with my Canon 5DII, and capture a superwide image without the bending. Unrealistic?

Yes, unrealistic. Fisheye Hemi won't do it, as it only straightens vertical. PS will do it, but two things will happen: first, you will lose a lot of resolution because the squeezed parts have to be stretched, and second, you will lose a lot in making it rectilinear, to the point that it will become equivalent to something around 21mm, and because you have to crop severely, it will give you a pixel count of around 6 MP, with the pixels near the edges already highly magnified.

rossk Loc: Melbourne, Australia

I have used it and find it very user friendly. Usually it is respectful of image quality and results are quite good. I use the Samyang 8mm fisheye lens on my xt4.

elliott937 Loc: St. Louis

Then I hear you saying that Fisheye Hemi won't gain much for me. That is good to know.

I've experimented with another approach. Keep in mind, I'm wanting to experience an increased in wide angle capture. I took an image from last week at our Botanical garden here in St. Louis. I took a couple of images so that I was intentionally distant from my target subject. Then I would do a 16:9 crop as we usually like, being sure the rectangle resided just inside the circular region you saw. Once the crop was complete, I then put that image into Fisheye Hemi. It was then able to 'unbend' the trees that needed to be unbent. I was pleased with the result.

Now I have to wonder, did this end product actually generate an image that was wider than I could capture with my standard 17-40 wide angle zoom lens. Any hunches you have to offer?

kymarto Loc: Portland OR and Milan Italy

elliott937 wrote:

Then I hear you saying that Fisheye Hemi won't gai... (show quote)

My understanding is that it would have been what you would have gotten with a 21mm lens if you were to make it strictly rectilinear. You could easily do an experiment to see, though if you left the horizontals curved, which happens with fisheye hemi, then it would be, I believe, quite a bit wider, though not rectilinear.

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

elliott937 wrote:

Two of us are discussing this piece of software for ultra wide angle lenses, including 8mm.

If there is anyone else who has used this software, we'd appreciate hearing from you.

Bill

You may want to take a look at DXO Viewpoint. IMHO, it is light years ahead of pretty much all the lens distortion correction software - including circular and full frame fisheye.

https://www.martijnkort-photography.com/dxo-viewpoint-3-review-english/

kymarto Loc: Portland OR and Milan Italy

Gene51 wrote:

You may want to take a look at DXO Viewpoint. IMHO, it is light years ahead of pretty much all the lens distortion correction software - including circular and full frame fisheye.

https://www.martijnkort-photography.com/dxo-viewpoint-3-review-english/

Photoshop also has this type of correction, if I am not mistaken. I have Viewpoint and have never noticed that it is much superior to later versions of PS, but I have not explored lens corrections on either in great depth. I do know that I did try to do rectilinear corrections of full frame fisheye shots many years ago and found results from rectilinear lenses much better.

elliott937 Loc: St. Louis

Gene, the Viewpoint 3 looks like an amazing piece of software. I do want to explore more photography with extreme wide angle, as in an 8mm lens. Thank you for the suggestion. I'm going to download a trial version tomorrow.