Re: [hugin-ptx] Abridged summary of hugin-ptx@googlegroups.com - 9 updates in 1 topic

[Jan Steinman]

With circular fisheye lenses, you need to crop so there is no black border. 

Even then, I've had poor luck with the Laowa and the 7Artisans circular fishes.

I realize it doesn't have the same angle of view, but I've had much better results with the M.Zuiko 8mm ƒ/1.8 full-frame fish and even the oddball Meike 6.5mm semi-circular fish.

The latter is an odd duck. It appears to be an APS-C circular fish on a µ4/3rds mount, with all the disadvantages of both full-frame and circular fishes. The top and bottom of the circle are cropped, but the sides are not. The only way I've been able to get this to stitch is to crop the sides about equal to the top/bottom crop.

Bottom line: hugin doesn't seem to like unexposed areas in the frame. If you really want to make a circular fish stich, I recommend cropping into both the sides and the top. At which point, you're better off with a full-frame fish.

On Feb 4, 2025, at 07:53, hugi...@googlegroups.com wrote:

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• Experience with 7Artisans 4 mm fisheye? - 9 Updates

Experience with 7Artisans 4 mm fisheye?

Greg 'groggy' Lehey <groo...@gmail.com>: Feb 04 01:16PM +1100 I have recently got a 7Artisans 4 mm f/2.8 circular fisheye lens with an angle of view of claimed 225°. I'm using it on an Olympus E-PM2, and I'm having no luck at all stitching panoramas. ...more

David W. Jones <gnome...@gmail.com>: Feb 03 08:08PM -1000 On 2/3/25 16:16, Greg 'groggy' Lehey wrote: > clearly wrong. Is there any way to tell the GUI or the underlying > scripts what the real angle of view is?   > Greg   Hi, Greg! ...more

Greg 'groggy' Lehey <groo...@gmail.com>: Feb 04 05:24PM +1100 On Monday, 3 February 2025 at 20:08:38 -1000, David W. Jones wrote:   > I tried several different ways of generating control points with > your JPEGs, and was unable to generate any control points ...more

David W. Jones <gnome...@gmail.com>: Feb 03 08:43PM -1000 On 2/3/25 20:24, Greg 'groggy' Lehey wrote: > Did you set the lens type to circular fisheye? What angle of view did > the GUI claim? I did get something like a panorama, but it was ...more

Greg 'groggy' Lehey <groo...@gmail.com>: Feb 04 05:55PM +1100 On Monday, 3 February 2025 at 20:43:18 -1000, David W. Jones wrote:   > I didn't change the lens type, I just left it to whatever it > automatically selected. I've never used a fisheye lens at all, ...more

Marius Loots <marius...@up.ac.za>: Feb 04 09:01AM +0200 I have the Laowa 4mm f/2.8 Fisheye lens. Used on Olympus OMD-EM5 II. Not any useful results. Certainly nothing like the examples here. This was a few years ago, and I should revisit the lens again. ...more

Bruno Postle <bruno...@gmail.com>: Feb 04 09:52AM Hi Greg, these pictures stitch ok.   ..but you really need to centre the lens on the tripod as there is a lot of parallax error in this scene. In this situation you should only use control ...more

Bruno Postle <bruno...@gmail.com>: Feb 04 10:09AM Also, once you have calibrated your distortion and vignetting parameters (use four shots for this), you should be able to take good two-shot 360 panoramas with this setup (but always optimise FoV ...more

Bruno Postle <br...@postle.net>: Feb 04 11:21AM As a first approximation, the point you need to rotate the lens around is where the aperture *appears* to be when you look at the lens from the outside.   With a fisheye like this, this point will ...more

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