Time was, you wouldn't see a plastic drive gear in $300 body let alone a $3500 one

On 9/11/2016 7:57 PM, Eric Stevens wrote:
On Sun, 11 Sep 2016 13:29:48 -0400, PeterN
wrote:

On 9/11/2016 1:34 AM, android wrote:
In article ,
Eric Stevens wrote:

On Sun, 11 Sep 2016 09:24:42 +1200, Me wrote:

On 10/09/2016 20:41, Eric Stevens wrote:
On Fri, 9 Sep 2016 21:03:51 -0700 (PDT), RichA
wrote:

I remember the Pentax K1000 which was a cheap DSLR at the time ($120) and
it had a gear like that that would strip. A problem OM-1n's and Nikon
FE's didn't have.
Meanwhile...

https://www.dpreview.com/news/914199...side-the-canon
-eos-5d-iv?slide=7

It's good enough for timing gears inside an engine. Why should it not
be good enough for a camera?

Plastic and plastic coated timing gears inside an engine were a pretty
awful idea - often with a high failure rate (they also created a market
for non-OEM metal replacement gears).
However I doubt the plastic gear in the Canon 5D IV is expected to
endure operation for thousands of hours at high temperatures.

So what is essentially wrong with using it?

You se plastic gears in lots of things that lasts well but the precision
in manufacturing of the device have to be high since a slightly
displaced gear like this will be milled down fast.
This is a $3k+ camera and this is a likely kill switch for it over time.
Not that I don't think that competition as similar ones in less
inspectoral places. Reminds me of the dysfunctional A-1 that I
disassembled years ago.


IIRC my Nikon FM had plastic gears on the winding spool., They failed
after about a year.

Was yours an FM or a FM2?

I had an FM and it was real work horse which never gave me any
trouble.


Probably an FM, but I wouldn't swear either way.

--
PeterN

On Sat, 17 Sep 2016 14:09:05 -0400, PeterN
wrote:

On 9/11/2016 7:57 PM, Eric Stevens wrote:
On Sun, 11 Sep 2016 13:29:48 -0400, PeterN
wrote:

On 9/11/2016 1:34 AM, android wrote:
In article ,
Eric Stevens wrote:

On Sun, 11 Sep 2016 09:24:42 +1200, Me wrote:

On 10/09/2016 20:41, Eric Stevens wrote:
On Fri, 9 Sep 2016 21:03:51 -0700 (PDT), RichA
wrote:

I remember the Pentax K1000 which was a cheap DSLR at the time ($120) and
it had a gear like that that would strip. A problem OM-1n's and Nikon
FE's didn't have.
Meanwhile...

https://www.dpreview.com/news/914199...side-the-canon
-eos-5d-iv?slide=7

It's good enough for timing gears inside an engine. Why should it not
be good enough for a camera?

Plastic and plastic coated timing gears inside an engine were a pretty
awful idea - often with a high failure rate (they also created a market
for non-OEM metal replacement gears).
However I doubt the plastic gear in the Canon 5D IV is expected to
endure operation for thousands of hours at high temperatures.

So what is essentially wrong with using it?

You se plastic gears in lots of things that lasts well but the precision
in manufacturing of the device have to be high since a slightly
displaced gear like this will be milled down fast.
This is a $3k+ camera and this is a likely kill switch for it over time.
Not that I don't think that competition as similar ones in less
inspectoral places. Reminds me of the dysfunctional A-1 that I
disassembled years ago.


IIRC my Nikon FM had plastic gears on the winding spool., They failed
after about a year.

Was yours an FM or a FM2?

I had an FM and it was real work horse which never gave me any
trouble.


Probably an FM, but I wouldn't swear either way.

Very likely an FM as FM2s had that fact embossed large on the front of
the body's upper metal cover and I would expect that you would have
noticed.

FM https://dl.dropboxusercontent.com/u/...3/_DSC1807.jpg

FM2
https://upload.wikimedia.org/wikiped...FM2_-_face.jpg
--

Regards,

Eric Stevens