Question 1

What is an 8mm fisheye lens actually good for?

Accepted Answer

An 8mm circular fisheye like this Sigma maps a full 180° hemisphere onto a circular image inside the frame. In practice that means astrophotography (full sky dome in one shot), immersive skateboard or action photography where you shoot from ground level, and dramatic landscape compositions where straight lines deliberately become curves. It's a specialty tool — not a general walk-around lens — but within its niche it does things no rectilinear wide-angle can replicate.

Question 2

Is buying a used Sigma 8mm f/3.5 EX DG Fisheye worth it?

Accepted Answer

Yes, and this is actually one of the smarter used-lens buys in the Nikon F ecosystem. Fisheye lenses see lighter use than everyday primes, the EX-series housing ages well, and there are no moving zoom parts to degrade. At Camera-tweedehands.nl, every lens is professionally inspected and photographed before listing, and comes with a minimum 12 months warranty — giving you creative capability for considerably less than new, especially if astrophotography or fisheye landscapes are only part of your shooting rather than your daily job.

Question 3

Does the Sigma 8mm f/3.5 EX DG Fisheye work on a full-frame Nikon DSLR?

Accepted Answer

Yes. The lens is designed for full-frame (FX) Nikon F bodies and produces its signature circular fisheye image — a round picture with a black surrounding frame — on those cameras. On APS-C (DX) Nikon bodies the smaller sensor crops into the circle, so you lose the full circular look but gain a wider effective magnification of the fisheye effect. Most astrophotographers and circular-fisheye enthusiasts use it on full-frame to get the complete 180° circular projection.

Question 4

How close can the Sigma 8mm 3.5 fisheye focus?

Accepted Answer

The minimum focusing distance is 13.5 cm (about 5.3 inches) from the front of the lens. That's remarkably close, and combined with a maximum magnification of 1:4.6 it lets you fill the circular frame with a small subject in the foreground while still retaining a wide environmental background — a technique sometimes called 'close-focus wide-angle' and a signature look for fisheye environmental portraits or macro-adjacent nature shots.

Question 5

Can you use standard screw-on filters on the Sigma 8mm f/3.5 EX DG Fisheye?

Accepted Answer

No. The bulbous protruding front element rules out any screw-on or drop-in front filters. Instead, the lens uses a rear slip-in gelatin filter system — a small slot at the back of the barrel where you can insert cut-to-size gel filters. For astrophotography this is actually useful, since you can slot in a light-pollution filter without needing a front-mounted solution.

Question 6

How does the Sigma 8mm f/3.5 compare to the Rokinon 8mm f/3.5 Fisheye for Nikon F?

Accepted Answer

Both share the Nikon F mount and the same maximum aperture, so the optical formula and price tier are comparable. The key practical difference is autofocus: the Sigma 8mm f/3.5 EX DG supports autofocus, while the Rokinon equivalent is fully manual focus. For astrophotography manual focus is standard anyway (you're focusing at infinity), but for action or street use the Sigma's AF is a genuine advantage. Build quality on the Sigma EX series is generally considered a step above the Rokinon.

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Sigma 8mm f/3.5 EX DG Fisheye - Nikon F

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