The Minolta 4000 AF flash is for use with the new MAXXUM 7000 and other MAXXUM cameras.
The 4000 AF is a high performance medium-large flash. It has an automatic zoom head, swivels in two axes for bounce and a backlit LCD on its rear. Its performance is high, with a built-in infra-red AF illuminator, a great standby circuit so it can be left on all the time and modern thyristor circuitry for super-fast recycle times, however the early MAXXUM cameras weren't very smart in terms of exposure flexibility and sync speeds.
The 4000 AF may work on the newest Sony Alpha cameras, which descend from MAXXUM.
The 4000 AF uses a standard hot shoe. Minolta and then Sony used a screwy new shoe from about 1988-2012, and Minolta made adapters so that this flash will work on the slot-style hot shoe.
The 4000 AF has a long 15 minute standby time-out. It goes to sleep all by itself after 15 minutes, and wakes up with your camera. Therefore it's AOK to leave it turned on all the time.
Beside more power than the 1800 AF or 2800 AF, the 4000 AF adds manual power control, as well as bounce and a zoom head
Power Output
Rated guide number 131 feet (40 meters) at ISO 100 with zoom head at 50mm.
Exposure Modes
TTL and manual.
Lens Coverage
Zoom head automatically covers 28 to 70mm lenses.
Wide adapter covers to 24mm lenses.
Program Mode Distance Range
Program mode forces f/2.8:
2.3 to 46 feet at ISO 100 at 50mm.
AF Illuminator
3.3 to 23 feet range.
1 to 7 meters range.
Power Source
4-AA.
Rated 90 to 2,500 shots on alkaline.
Rated 40-500 shots on 1,000 mAh Ni-Cd.
Rated 80-1,000 shots on 2,000 mAh Ni-Cd.
Recycling
Rated 10 to 0.2 seconds on alkaline.
Rated 6 to 0.2 seconds on Ni-Cd.
Standby
Automatically goes to sleep after 15 minutes.
Wakes up as soon as a MAXXUM camera wakes up.
Size
Rated 3-1/4 x 5-11/16 x 4-1/16 inches.
Rated 82 x 144.5 x 102.5 mm.
Weight
Rated 17-7/16 oz. (495g) empty.
Quality
Made in Japan.