Question 1

Does the Sigma 8mm f/3.5 EX DG Fisheye produce a circular or full-frame image?

Accepted Answer

On a full-frame Canon DSLR, the Sigma 8mm f/3.5 EX DG produces a circular fisheye image — a round bubble surrounded by black — with a 180-degree angle of view. On an APS-C body, the crop factor means the circle fills more of the frame, reducing the black border and giving a different compositional result.

Question 2

Is the Sigma 8mm fisheye good for astrophotography?

Accepted Answer

Yes — the f/3.5 aperture lets in a solid amount of light for night sky work, and the 180-degree field of view is ideal for capturing full dome star trails or the Milky Way arch in a single shot. The rear drop-in gelatin filter slot also lets you use light-pollution filters without needing a front filter ring, which is a practical bonus for astro shooters.

Question 3

Can I use filters on the Sigma 8mm f 3.5 EX DG Fisheye?

Accepted Answer

Standard front-mounted filters aren't possible because of the extremely curved front element, but the lens includes a rear drop-in gelatin filter slot. This lets you cut small pieces of gel filter material and slot them in — useful for ND, light-pollution, or colour correction filters in the field.

Question 4

How does the Sigma 8mm f/3.5 compare to the Sigma 15mm 2.8 fisheye?

Accepted Answer

The Sigma 8mm f/3.5 EX DG is a circular fisheye — it produces a round image circle on full-frame. The Sigma 15mm f/2.8 EX DG is a diagonal fisheye, which fills the entire frame edge-to-edge with the distorted fisheye look. If you want the full circular bubble effect, go with the 8mm. If you prefer a fisheye image that uses the whole sensor, the 15mm is the better fit. The 15mm also has a wider maximum aperture at f/2.8.

Question 5

Is buying a used Sigma 8mm fisheye for Canon a safe choice?

Accepted Answer

It can be a smart move. This is a prime lens with no zoom mechanism, which means fewer moving parts that can wear out. Every second-hand Sigma 8mm f/3.5 EX DG on Camera-tweedehands.nl is individually inspected and photographed before listing, and comes with a minimum 12 months warranty — so you're covered if anything is off. Check the condition grade on the variant listing for the exact warranty period.

Question 6

Is the Sigma 8mm f/3.5 EX DG compatible with Canon APS-C DSLRs?

Accepted Answer

Yes — the Canon EF mount fits both full-frame and APS-C Canon DSLRs. On an APS-C body with a 1.6x crop factor, the effective field of view narrows and the circular image fills more of the frame, which some photographers prefer for a more dramatic fisheye look rather than the classic full circular presentation.

Mount	Canon EF
Focal range	Fisheye
Prime / Zoom	Prime
Focal length (min)	8 mm
Focal length (max)	8 mm
Max. aperture	f/3.5
Year of release	2006
Maximum Aperture - Tele (f)	3.5

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Sigma 8mm f/3.5 EX DG Fisheye - Canon EF

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About the Sigma 8mm f/3.5 EX DG Fisheye - Canon EF

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