Kategorien: Fotografie - Borbin the 🐱

7Artisans Fisheye 7.5mm f/2.8 Nikon Z gets a makeover

📅 24. Juni 2023 · Fotografie

The support ring of the 7Artisans Fisheye for Nikon Z mount is 55.04mm, while the Nikon Z mount itself is 55mm.
Tight fit. You can barely screw that thing on.

The Nikkor 16-50mm is 54.91mm.

Even a cheap F to Z mount adapter is within tolerances.

To fix this, first unscrew the lens mount.

The support ring needed to be reduced to 54.60mm. The mount is not perfectly round and a first trial to 54.80mm was still too tight.
Chinese tolerances of the overall mount, I guess.

If you don't have access to a Lathe, you can use a fine file and make several rounds to take off the 0.2mm. Take your time and use tape to protect the ring.
Note: The mount is positioned with the red dot next to the Aperture print.

Done, Lens meets Camera.
Now it fits mirrorless.

Update:

The lens is sharp only on one side.
Crop from the top part of the test picture. This is with f/5.6:

Camera rotated 180°:

Stopping down to f/8 improves things and of course its getting better with f/16.
Pay for a f/2.8 lens and use it like a pinhole camera.

Another creative feature is the remarkable colored lens flare when you point towards the sun with f/8-f/16. You get that for free when doing a 360°×180° panoramic image on a sunny day.

Update of the Update:

I contacted 7artisans through both their main site and store but received no response.

The issue was resolved by switching to a TTArtisan 7.5mm f/2.0, which matches the sharpness of my 7artisans copy even at f/2.0. The support ring measures a perfect 54.90 mm in diameter and mounts smoothly.

With that, my chapter with 7artisans ends here.

Stadtbilder von Rom

📅 11. April 2022 · Fotografie

A Day in Florence, Italy

📅 11. April 2022 · Fotografie

Photo series from a day in Florence, Italy.
Starting with arrival by train, the images capture various aspects of the city: entrances, local merchandise, architectural details, and culinary impressions. The selection reflects a spontaneous walk through urban spaces, offering a straightforward visual impression of Florence.

Arrival by Train:

Entrance:

Merchandise is all about leather in this town:

Uncropped equirectangular projections of the town:

(Mercator projection, perfectly vertical aligned)

(Mercator projection, 7° pitch)

(Mercator projection, perfectly vertical aligned)

(Mercator projection, 7° pitch)

The Map:

5-star Tiramisu cake:

More Panoramic Scenes from Florence:

Ponte Vecchio
Piazza della Signoria
Kathedrale Santa Maria del Fiore
Ponte Vecchio over the Arno river
Michelangelo's David

Fisheye as the universal wide angle lens

📅 18. März 2022 · Fotografie

Using a fisheye lens for street pictures as a universal wide angle lens lets you choose how the projection should look like.

Index strip created with cPicture.

Rectangular projection

Equirectangular projection

Using a wide angle lens, you need to step much further to the back to get this field of view. With the fisheye, you stand right at the first step line.