TTArtisan 250mm f/5.6 Full Frame Reflex Lens M42
The TTArtisan 250mm f/5.6 Full Frame Reflex Lens M42 is a compact telephoto lens featuring a mirror lens design and distinctive donut bokeh. Unlike traditional lenses that rely solely on glass elements, mirror lenses combine concave mirrors and lenses to focus light.
These lenses are significantly smaller and lighter than conventional telephoto lenses with a comparable focal length. Their typically long focal length makes them popular for photographing distant subjects.
Due to their unique optical design, mirror lenses cannot be stopped down and produce a characteristic 'donut bokeh': a background with ring-shaped out-of-focus areas around the main subject.
Thanks to this optical design, the lens is not only compact and lightweight, but also achieves low chromatic aberration and excellent image quality.
The TTArtisan 250mm f/5.6 creates dreamy, distinctive donut bokeh. Combined with rich colours, this results in a unique visual style that is particularly well suited to creative portrait and nature photography.
Highly reflective metal mirror
The lens features a metal mirror structure (48× high-reflective coating) with a reflectivity of up to 98%.
Thanks to its catadioptric design, weight and size are kept easily manageable, even without image stabilisation or autofocus. Designed for the M42 mount, it can be used with any mount via a separately available compatible mount adapter (EF, EF-M, RF, X, F, Z, L, GFX, XCD).
The TTArtisan 250mm f/5.6 is a full-frame lens. The actual image circle can also cover almost medium format. There is very slight vignetting in the outermost corners.
It is normal for the centreline of the screw-mount lens not to align perfectly with the centreline of the camera body. This does not affect usability. A tip worth noting: if you use a mount adapter with this lens, it is advisable to choose one with a centreline adjustment feature.
The lens design has a distinctive retro look, with a delicate diamond-pattern texture on the focus and bayonet ring, providing a pleasantly tactile feel.
