The Brightin Star MF 7.5mm f/2.8 IV is a manual fisheye lens for mirrorless APS-C cameras like those from Fujifilm. With its extremely short focal length, it offers photographers a compact option to deliberately use unusual perspectives and strong image distortion as a creative element.
Technical Data and Optical Construction
The Brightin Star MF 7.5mm f/2.8 IV is specifically designed for camera systems with APS-C format sensors. On a Fujifilm camera, the effective focal length corresponds to approximately 11 millimeters in full-frame format, considering the usual crop factor.
The lens covers a diagonal angle of view of nearly 180 degrees, allowing extremely wide subject capture. The maximum aperture is f/2.8, which permits solid exposure even in lower ambient light. The lens can be stopped down continuously to a minimum aperture of f/16.
The optical construction consists of several glass elements housed in a solid barrel. As this is a purely manual lens, there are no electronic contacts to the camera. This means that no information about aperture or focal length is recorded in the EXIF data of the image files. Automatic focus control is also completely absent. Focusing is done manually via the focus ring.
The minimum focusing distance is very short, just a few centimeters from the front lens. A built-in lens hood protects the strongly curved front element from mechanical impact and stray light.
A conventional filter thread is not available due to the curved design of the lens. Instead, a 27mm filter can be attached at the rear.
The package includes a protective cap that fits precisely over the lens hood. The weight of the optic is very low at just under 200 grams, and the dimensions are extremely compact.
In Practice with the Brightin Star 7.5mm f/2.8 IV
First Impression and Build Quality
The first tactile test after unboxing the Brightin Star 7.5mm f/2.8 IV is consistently positive. The lens is very solidly built and entirely made of metal, conveying a pleasant sense of quality.
Mounted on a Fujifilm camera, the small optic looks good. The black metal body blends seamlessly with the classic design of the camera. The lens looks very stylish and chic on the Fujifilm camera, forming a balanced unit with the camera body.
In practical handling tests, however, one point becomes apparent. The aperture ring from the manufacturer rotates smoothly and has no noticeable detents. In everyday use, it turns out that this Brightin Star aperture ring is a bit too sensitive. Because the ring rotates very easily, it can easily happen that you unintentionally change the set aperture when adjusting focus or gripping the camera.
Here, a click stop at each aperture value would have been better to prevent unnoticed adjustment during work. Apart from this characteristic, the mechanical construction of the lens leaves a robust impression.
The Peculiarities of the Extreme Focal Length
Working with a focal length of 7.5mm presents an interesting challenge. This focal length restricts you in a certain way, as the wide angle of view does not suit every subject. At the same time, it gives you many interesting creative possibilities if you engage intensively with the optics and seek unusual angles. Vertical and horizontal lines curve strongly as soon as they do not run exactly through the center of the image, giving spaces and landscapes a dynamic effect.
What someone using the lens for the first time will surely find surprising is the clear difference between perception in the viewfinder and the actual environment. When you look through the electronic viewfinder, the chosen subject appears very small and far away.
However, when you take the camera away from your eye, you are astonished to find that you are standing directly in front of the subject. This optical effect requires a change in your habits. You have to get much closer to objects than you are used to with standard focal lengths to fill the frame meaningfully.
Tips for Optimal Everyday Use
To achieve quick and sharp results when photographing with the manual fisheye, some settings on the Fujifilm camera prove very helpful.
As a first step, you should enable Focus Peaking in the camera menu. This function highlights sharp contours in the viewfinder in color and noticeably simplifies manual focusing. Although focusing at 7.5mm is quite straightforward due to the large depth of field, this focusing aid provides reliable orientation for close-up shots.
Additionally, it is useful to use the zoom function of the electronic viewfinder. With a simple press of the camera's control dial, you can magnify the selected image section to precisely control the focus point.
Besides camera settings, the extremely wide angle of view of almost 180 degrees also requires some discipline in how you hold the camera. Constant care must be taken with your fingers on the lens barrel, as they can quickly appear at the edge of the frame if you are not careful. Likewise, be careful with your feet, because if you tilt the camera slightly downward, your own shoe tips can easily enter the frame.
A practical trick also applies to accessories. Use a hand strap instead of a neck strap to get very close to subjects and reach unusual positions. A neck strap can get in the way when the camera is positioned low near the ground.
A flexible hand strap, on the other hand, provides full freedom of movement, allowing the camera to be easily guided just above the ground or held high above your head to discover new perspectives.
Image Quality in Practical Use
The image sharpness of the Brightin Star 7.5mm f/2.8 IV shows solid performance in the center at open aperture f/2.8. For everyday subjects and creative experiments, the sharpness in the center is already completely sufficient. Stopping down to values like f/5.6 or f/8 noticeably increases sharpness in the center and shows clear detail rendering.
Towards the outermost edges and corners, sharpness drops off somewhat due to the design. For a fisheye in this price and size class, this edge sharpness falloff is a normal optical phenomenon. Vignetting is visible at the corners at f/2.8, but decreases significantly with slight stopping down.
Chromatic aberration on high-contrast edges occasionally occurs in strong backlight, but remains within a moderate range. The imaging performance is down-to-earth and honest for the intended purpose.
Correcting Distortion with Lightroom
For photographers who want to reduce the typical fisheye curvature, the manufacturer provides a correction profile on their website. This profile can be loaded into editing programs like Adobe Lightroom to digitally convert the barrel distortion to straight lines.
In practice, however, this digital adjustment shows a mixed picture. Personally, I don't really like the corrected look. The digital rectification of the images stretches the corners extremely, leading to a noticeable loss of sharpness at the edges.
Moreover, the actual character that makes a fisheye lens what it is gets lost. The curved optics are intended as a creative tool. If you want a straight wide-angle photo, you usually achieve more balanced results with a true wide-angle lens than by subsequent alignment in software.
Conclusion
The Brightin Star MF 7.5mm f/2.8 IV proves to be a handy specialty lens for creative photography projects in everyday testing. What I like about the lens is that it is relatively compact. Especially compared to other lenses in this focal length range, particularly in full-frame, it is pleasantly small, even if you certainly pay for this partly with compromises in image quality.
For me, compactness is clearly more important here because, for me personally, it is a less frequently used focal length. The larger the lens, the lower the chance that I will take it with me and not leave it at home.
The solid metal construction, the handy form, and the appealing exterior fit well with the Fujifilm system. The aperture ring without detents requires some attention in handling but does not impair the core function.
The image quality is good in the center and absolutely practical for the given size. If you are looking for a light and affordable fisheye for occasional experiments, this prime lens offers an interesting option.
Buy
The Brightin Star MF 7.5mm f/2.8 IV lens is available through various retail channels. An easy ordering option is available on well-known online platforms like Amazon. Alternatively, the lens can be purchased directly from the manufacturer's official store at Brightin Star Official Store. When purchasing, be sure to select the correct mount for your camera system to ensure compatibility with the Fujifilm X mount.
More Sample Images
All images in this article were taken with the Brightin Star MF 7.5mm f/2.8 IV and the Fujifilm X-T20 or Fujifilm X-E5. All images were edited with Adobe Lightroom.
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