I had a T 90 for a few years but I part exchanged for another Canon F1n body, about two years ago that I much prefer.The T90 was considered by many to a pro level camera, I had one along with a couple of lens and used it off and on for a few years, as I was ramping up Minolta AF I sold it on. I thought it was well made, from the Canon Camera Museum
"Developed as the top-of-the-line T-series camera, the T90 is a multi-mode SLR with built-in motor drive. The form of the pentaprism hump is a distinct characteristic. Instead of being sharp-edged like on previous cameras, it is rounded with smooth curves. The camera was designed to lessen the picture-taking burden on the user via automation. It aimed for seamless operation to respond to the user’s will. A lot of top-notch technology and thought went into the camera.
The camera has three metering systems to suit diverse shooting conditions. Eight autoexposure modes and two manual exposure modes also make the camera highly versatile. Drive operations are divided among three small coreless motors to consume less power. With four size-AA batteries, the built-in motor drive can shoot at a maximum of 4.5 fps. It was truly a top-of-the-line camera. In Japan, the camera’s nickname was “Tank.”
The internal lithium battery allows the camera to retain the ISO setting and the frame counter data when the main AA batteries are removed / replaced. Not an issue if you will shoot a roll of film using the same set of batteries. In the worst case with a dead internal battery you may have to reset the ISO for the metering when new AA batteries are loaded. You will, however, lose the frame counter data but the camera will detect the end of roll by tension on the film and rewind automatically. I don't mind leaving a set of NiMH batteries in the camera for a period where I don't finish a roll of film for a few days.The T90 had an internal Lithium battery that powered the memory that according to Canon when the camera was in current production wasn't user replaceable, and would last about ten years that involves almost completely dismantling the camera to replace,and it's been about 35 years since then.
I will never own a T-90, but i appreciate that info.The internal lithium battery allows the camera to retain the ISO setting and the frame counter data when the main AA batteries are removed / replaced. Not an issue if you will shoot a roll of film using the same set of batteries. In the worst case with a dead internal battery you may have to reset the ISO for the metering when new AA batteries are loaded. You will, however, lose the frame counter data but the camera will detect the end of roll by tension on the film and rewind automatically. I don't mind leaving a set of NiMH batteries in the camera for a period where I don't finish a roll of film for a few days.
I have the instructions for the internal battery replacement and it's not a job for the faint hearted. The lithium battery is not a standard button cell but it has two tags which must be unsoldered / resoldered during replacement. There are also a couple of extra wires which must be disconnected to allow access to the battery. The lithium battery should have just been a standard cell, (stored under the palm wing?), which could be replaced by the user. Much the same as in the date backs on later AF SLR's.
I don't fear losing the facility of the internal battery.
I’ve had a T90 for years. Yes, I’ve found that if the camera wouldn’t work, a good smacking on the floor addressed the issue (I have a vague recall that the problem involved magnets that needed to be jarred into freedom). One aspect of the T90 that I like is the multi-read spot meter that allows the photographer to take up to 9 spot readings in a scene, with the camera calculating the final exposure. So you can meter a highlight, then meter a shadow, then maybe meter another shadow knowing that the final exposure will be slightly skewed toward more exposure by that third meter reading. It’s almost like using exposure compensation when you can add additional spot meter reading of various shadows or highlights to swing the final aggregate reading one way or the other. I’ve probably not explained this very well....
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