Hi, i own maxxum 5000 with sigma 28-200mm. The problem is that even though the camera allows me to change aperture value e.g. 22, 19, 8, 4 etc, it doesn't physically open the aperure at all. I tried my lens on another maxxum 5000 and is working perfectly fine. The problem I believe is that camera doesn't send an electronic impulse to the lenses and thus the lenses refuse to open (I can see a tiny hole when looking through it's back) and I believe the lightmeter is OK. I tried using unimer to measure value on camera's pins onto which lens pins are laid and some of them do not show voltage at all. What do I do, please advise.
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First, check if you're taking the lens cap off. If you're taking it off, then check your exposure. See if your light meter responds to changes in illumination. If everything seems fine, then check if the aperture of the lens works as intended. Then, without a lens nor film in bulb mode, check for the mirror and shutter to work properly. If the light meter, aperture, mirror or shutter seem to flaw, then get your camera serviced by an experienced camera repair technician.
Minolta had two lens mounts. One for manual focus SLR film cameras and one for Auto Focus SLR Maxxum film and digital SLR cameras. Sony uses Minolta Maxxum lens mount. If the Sigma 400 f5.6 lens was made for Minolta X-700 series, XG, series, XD series, SRT series, then it will not fit on your camera.
The problem sounds like the camera did not reset properly after the last exposure. Minolta deigned the camera to keep the aperture fully open except during exposure. During exposure it snaps the aperture down to the selected opening, then opens it again to allow enough light for proper focusing. If it did not fully open the blades after the shot, much less light would pass through the lens. The viewfinder would be darker and look murky. Most likely cause? Dried up lubricants in the camera. Next likely cause? Teeth broken on a plastic gear. Get it to a camera repair place. Get estimates first.
Most likely: weak batteries on/off switch has internal corrosion Battery contacts corroded If fresh batteries do not cure the problem, it needs repair. Consider the cost of repair vs. replace with another Maxxum 5000/7000 on Ebay. They go pretty cheap these days. They're practically giving away the flashes for those early maxxums, even the 4000 flash.
Sounds like the aperture control mechanism is bad (Minolta Maxxums are famous for this problem). I would recommend sending the camera to Sony for repair (Sony now owns Minolta's photographic departments). I've been repairing the Minolta Maxxum cameras for over 15 years and I prefer to send the Maxxum 7 in for this repair do to Minolta's difficult design of this camera.
It sounds like a CPU chip incompatability issue. Sigma has that problem sometimes but are usually very good about rechipping at no cost (at least for Nikon-mount lenses). What did they say when you asked them?