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Minolta Maxxum/Dynax 7 aperture problem common?

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Post Options Post Options   Quote boomshtick Quote  Post ReplyReply Direct Link To This Post Topic: Minolta Maxxum/Dynax 7 aperture problem common?
    Posted: 05 November 2018 at 14:41
Hello, I would like to get a maxxum/dynax 7, but I keep reading about this aperture base assembly error/problem. I've basically accepted that it's a risk, but I was wondering, how common is it really? Is it this evil beast lurking behind the film door of every 7, or is it just something that can happen but has been talked about a lot? I know it doesn't help that there's a youtube video up basically starring it.

thanks!
-Adam
 



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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 05 November 2018 at 15:00
The aperture mechanism was broken on the only one I've held.
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AudioDoc View Drop Down
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Post Options Post Options   Quote AudioDoc Quote  Post ReplyReply Direct Link To This Post Posted: 05 November 2018 at 16:14
Whether it is the Maxxum 7 or any other camera, or product, for that matter, it could possibly break. Don't let that keep you from buying the camera. The Maxxum 7 is a great one. Find one in good working order and you will likely never have any problems with it. I have one that I purchased new and one that was used a lot, and both work fine. Don't spend too much time reading that type of stuff on the internet. And don't spend a lot of money on any film camera that you intend to use. There is a flood of them out there that are no longer in use since there are only a few of us analog die-hards out there still shooting film.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 05 November 2018 at 16:28
Welcome to Dyxum, Boomshtick

The aperture mechanism is a relative weak spot on several A-mount cameras. Having said this, none of my A-mount cameras have problems, that includes my Dynax 7. There is AFAIK no reason to avoid the camera. The advice by AudioDoc is sound. Get one and enjoy it.

Come to think of it, in this thread there are three perfectly fine Dynax/Maxxum 7 cameras and only one that is faulty.
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boomshtick View Drop Down
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Post Options Post Options   Quote boomshtick Quote  Post ReplyReply Direct Link To This Post Posted: 05 November 2018 at 21:01
Good points, all; thanks! The biggest impression I've gotten is that everyone loves this camera and the 9; they both seem to be the film world's best kept secret!

Also, it's more of an A-mount issue than a camera issue?
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Post Options Post Options   Quote petesidewalk Quote  Post ReplyReply Direct Link To This Post Posted: 06 November 2018 at 00:11

Gents,
I have two. One is in like-new condition with a grip and original strap. The other has broken plastic on the top from an apparent blow of some sort. They both function flawlessly. The only negative experience I have had so far is that my Sigma 12-24 HSM II refuses to work on either 7 body. Oddly enough, it works very well on my Maxxum 9 with SSM upgrade. Belated happy birthday to AudioDoc, a wise and appreciated fellow!

Greg
 



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Post Options Post Options   Quote glefebvre Quote  Post ReplyReply Direct Link To This Post Posted: 06 November 2018 at 00:25
I purchased my Maxxum 7 new and just recently it developed an aperture issue and therefore is no long a usable camera. Bummer.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 06 November 2018 at 00:37
Both of mine have worked fine for a number of years .
A bit of isopropyl alcohol cured the sticky back problem great .
What aperture issue ?!
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Post Options Post Options   Quote AudioDoc Quote  Post ReplyReply Direct Link To This Post Posted: 06 November 2018 at 01:04
Originally posted by petesidewalk petesidewalk wrote:


Belated happy birthday to AudioDoc, a wise and appreciated fellow!

Greg


Thank you, Greg!

Neil, with the Minolta 7, there is a separate motor with gears that drive the lens's aperture blades. When something fails, either with the motor, gears or drive circuit the camera will display "error" and won't operate. I've never had one disassembled (perhaps someone else here has) but I would guess the plastic gear press fit to the motor, cracks, as result the motor spins but the gears don't turn. Parts are NLA, and sadly that is probably the case with many older products. Like I say that is a guess based on my experience with other consumer electronic products. I wouldn't worry about it. It can happen, but I still think the percentage of cameras that fail with that problem is low. It probably may happen with other cameras as well, but Minolta sold a lot Maxxum/Dynax/Alpha 7s so there are a lot of them out there.

Kind regards,

Kelly
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Post Options Post Options   Quote vitor Quote  Post ReplyReply Direct Link To This Post Posted: 06 November 2018 at 22:17
I don't know the figures for this problem. Is it a common issue for only the 7 or is it a shared problem with other A-mount cameras?
I have several cameras including two 7 and never saw it happening.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2018 at 01:01
Originally posted by AudioDoc AudioDoc wrote:

Originally posted by petesidewalk petesidewalk wrote:


Belated happy birthday to AudioDoc, a wise and appreciated fellow!

Greg


Thank you, Greg!

Neil, with the Minolta 7, there is a separate motor with gears that drive the lens's aperture blades. When something fails, either with the motor, gears or drive circuit the camera will display "error" and won't operate. I've never had one disassembled (perhaps someone else here has) but I would guess the plastic gear press fit to the motor, cracks, as result the motor spins but the gears don't turn. Parts are NLA, and sadly that is probably the case with many older products. Like I say that is a guess based on my experience with other consumer electronic products. I wouldn't worry about it. It can happen, but I still think the percentage of cameras that fail with that problem is low. It probably may happen with other cameras as well, but Minolta sold a lot Maxxum/Dynax/Alpha 7s so there are a lot of them out there.

Kind regards,

Kelly


The only issue/fault I tend to hear of with the Dynax 7 is caused by over tightening into the tripod mount either a tripod or vertical grip .
It put's excess strain to a part "under there" and causes a problem , I can't remember off the top of my head if it causes the film to auto rewind early , or prevents the whole roll from rewinding at all .
But it's something on those lines ....
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Post Options Post Options   Quote AudioDoc Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2018 at 05:21
Vitor,

I haven't heard of many problems with the 7. The aperture base assy problem is one, along with the sticky back and I remember hearing once or twice about the film advance problem that Neil mentioned in his post.

I suppose most other Minolta AF cameras must use something similar to control the aperture. But I can't tell you if there have been similar failure in those cameras, but I'm sure it is possible. The symptom might be different. They may not display an "error" message (they might not have that capability -- the 7 had a lot more CPU hp then most -- very advanced for its time). Remember the 7 had a large display on the camera back for displaying data, which was quite unique for a film camera. Remember shooting film with 7 after using the 7D and glancing at that display after a shot? (Chimping).

Kelly
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2018 at 13:21
I have a large collection of Minolta film cameras and not had this fault on any of them, though the pentamirror stain on Dynax 4 and 5 is common.

I now have two 7D models, both with card read failures.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2018 at 17:18
I think that if something breaks, it often is the aperture base, but that does not mean it happens a lot.

The card read failure might be bent pins inside the CF slot. I do not know how people do it, but somehow some people jam these memory cards into their cameras in a way that bends these pins The weak spot of the 7D was the AS (Minolta called their IBIS Anti Shake) that caused the First Frame Black problem. Sony did warranty repair for it for years after they acquired Minolta.

ps. I think it was the AS, else it was the shutter assembly or a combination of both.
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