[tomcook]

What are the lens options for a full circle, 180° fisheye view?

[UncleVanya]

Crop or full frame?

[tomcook]

Full frame preferred, since it seems more practicable.

[sprint113]

It may not be optimal, but the Samyang/Rokinon 8mm fisheye II. Originally, version I had a permanent built-in hood restricting the FOV to an APS-C view. Version II has a detachable hood which results in a 180 degree circular image in full frame view.

[cmohr]

I have the Sigma 8mm F4 EX Circular Fisheye. It's a lot of fun.

give a full circle on the K-1, I shoot in 1:1 square crop mode when using it.

[Bophoto]

Sigma 4.5 / 2.8 gives you circular fisheye in APS mode on K1.
Sigma 4.5mm F2.8 EX DC HSM Circular Fisheye Lens Reviews - Sigma Lenses - Pentax Lens Review Database

[kayakfari]

If you're willing to go with Sony APSC, the Meike 6.5mm is a bright f/2.0 which makes a huge difference in the dark!
Also for APSC if you can find it, the Jenoptik Coastal Optics 4.88mm is an excellent lens, a bit slow at f/5.2. It's a t-mount so you can use it with any cam.

Here's a link to some "bubbles" :
On the fine ART of living in a lens Bubble! | kayakfari ( kayak .. far .. i )
(Most of the daytime is the Coastal, and the night ones with the Meike)


The main difference between the circular fisheyes is going to be cost and type of projection and coatings used.
The Coastal lens and the Samyang have a more pleasing look than most others, with less squashing near the circle edge! You can see the dramatic difference in the cactus bubble and the one with the tree below it.

Also, the old Sigma 8mm f/4.0 is a very nice FF lens if you can find it. If you have a Sony APSC, put it in front of a cheap focal reducer to get the full circle. IQ is great since only the center part is used!

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Last edited by kayakfari; 08-01-2018 at 09:58 AM.