Excellent illustration of the problem, bad enough if the adapter is brass,
much worse if it's aluminium.
...Wayne
>
> They all should be made by NC machine, even in mainland China they
> can't
> affort to hand made them and sell at such low price. The lens adapters
> I
> have are very accurate (from sample to sample), of course it is
> possible
> that some cheaper manufacturer just don't control it very well in the
> process or the design is weaker. 5mm movement is too much, the lens
> lock
> simply does not fit in.
>
> The major problem of these EOS adapter is there is no steel spring in
> use
> like the original OM lens adapter. The brass is too soft, if you mount
> heavy
> lenses, after playing it for some time the three "springs" will be
> flatten
> out and the friction is reduced, worse cases there will be a gap
> between the
> lens and adapter but there should be no play if the lens lock works.
>
> This image shown the construction of the original OM mount:
>
> http://www.accura.com.hk/temp/IMG_8106.JPG
>
> This image shown the Chinese adapter, note the lens lock see if this is
> the
> problem for lens rotation:
>
> http://www.accura.com.hk/temp/IMG_8107.JPG
>
> C.H.Ling
>
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