The Minolta Dynax 9xi (known as the Minolta Maxxum 9xi in the US and the Minolta α-9xi in Japan) is a professional 35mm autofocus SLR camera introduced in June 1992. It replaced the 1985 Minolta 9000 as the flagship model in Minolta's AF SLR lineup. ​ The "xi" in the model name stands for "eXpert Intelligence," signifying that the camera's underlying technologies were built upon the expertise of professional photographers. Innovations introduced with the xi generation included the use of fuzzy logic within the camera’s exposure programs, alongside additional automated features. For instance, several of the new lenses launched with the xi series were equipped with a power zoom. ​ Personally, I don't consider a power zoom to be a hallmark of professional photography; in fact, when paired with a pro-grade body like this one, it feels rather obstructive. A professional photographer wants to adjust the focal length with precise, tactile control—something that is simply not possible with any of the xi power zoom lenses I have encountered. More substantial innovations, however, include the transparent LCD matrix overlay beneath the focusing screen, which projects status information directly into the viewfinder, and the dual control dial interface, a layout already popularized by the Canon EOS lineup.

I had heard many positive reports about the optical quality of this lens. Unfortunately, its mechanics are quite fragile. The core structure of this 16-element lens consists of three nested metal barrels. And these exact metal barrels often pose a problem, as they can lose their alignment and precision due to bumps, impacts to the barrel, or other accidents.

Other weaknesses include a susceptibility to lens flare, chromatic aberrations (CAs, where different wavelengths of light refract at varying angles, causing color fringing), and blooming in high-contrast situations. To maximize sharpness, stopping down to f/8 or f/11 is required.

Nevertheless, I enjoy using this lens when traveling light or when shooting interior lost places under unproblematic lighting conditions. I also like using it on my Sony A7 III via the Sony LA-EA4 adapter. The autofocus is usually spot-on and sufficiently fast, and any distortion can be easily corrected in post-processing—provided you are shooting in RAW.

AF system: Minolta's through-the-lens phase detection system (TTL) with four CCD sensors; activated by Eye-Start; multidimensional predictive focus control; built-in AF illuminator, which is automatically activated in low light conditions or low contrast; AF sensitivity range: EV −1 to 19 (at ISO100)

Measurement: TTL type; 14-segment silicon honeycomb photocell (SPC) automatically activated by Eye-Start; second SPC for TTL flash metering of a dedicated flash unit; Range: Honeycomb EV 0-20, Center Weighted Average EV 0-20, Spot EV 3-20 (ISO100, 50mm f1.4 lens)

Shutter: electronically controlled type with vertical traverse and focal plane; automatic shutter speeds: in the "P" and "A" modes stepless from 1/12000 to 30 seconds, showing the nearest half-stop;

manual shutter speeds: in "S" and "M" modes 1/12000 to 30 seconds in increments of 1/2 stop plus BULB in M mode; x-sync shutter speed: 1/300 second; X-sync shutter speed in wireless/remote flash mode: 1/60 

Viewfinder: Fixed pentaprism at eye level with 92% vertical and 94% horizontal field of view; Magnification: 0.75× with 50mm lens at infinity; transparent LCD screen and acute matte screen; Diopter: -2.5 to +0.5 adjustable; long eye relief.

Screen: changeable at an authorized Minolta service facility; Type L (matte panel with grid) or Type S (matte panel with vertical-horizontal scales)

Film Speed Range:  Auto range: ISO 25-5000 in 1/3 increments; Manual Range: ISO 6-6400 in 1/3 stop increments

Battery: 6 volt 2CR5 lithium battery 

Battery Performance Approximately 50 KB movies (based on Minolta's standard testing method using movies  with 24 exposures)

Dimensions: 6 7/16 × 3 7/8 × 2 1/2 in. (163 × 98.5 × 64 mm)

Weight:  740 g (1 lb. 10 1/8 oz) without lens and battery; Quartz Data Back model: 755 g (1 lb. 10 5/8 oz) without lens and battery

Technical data without guarantee.

Minolta is fun too!!