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Re: [OM] New Digital Back - How much play should there be in the adapter

Subject: Re: [OM] New Digital Back - How much play should there be in the adapter EOS-OM
From: "Wayne Harridge" <wayneharridge@xxxxxxxxxxxxxxx>
Date: Wed, 30 Dec 2009 09:24:48 +1100
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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