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If you use a lens with a plastic bayonet, run your finger (or a q-tip)
around the rim of the lens mount. See that black stuff? That's fine,
black powder created by abrasion from the metal camera lens mount,
screw holes, etc, rubbing against the softer plastic lens mount each
time the lens is taken on or off the camera. That powder can and will
in-part end up on your sensor. This contrasts strongly with the far
lower wear level of metal to metal lens mounting systems. In
addition, the plastic powder is light and has a greater tendency to
float around when the lens is removed.

In article
<5b877747-415e-485f-89ad-(E-Mail Removed)>,
RichA <(E-Mail Removed)> wrote:

> If you use a lens with a plastic bayonet, run your finger (or a q-tip)
> around the rim of the lens mount. See that black stuff? That's fine,
> black powder created by abrasion from the metal camera lens mount,
> screw holes, etc, rubbing against the softer plastic lens mount each
> time the lens is taken on or off the camera. That powder can and will
> in-part end up on your sensor. This contrasts strongly with the far
> lower wear level of metal to metal lens mounting systems. In
> addition, the plastic powder is light and has a greater tendency to
> float around when the lens is removed.

Are you sure you're rubbing your finger around the right circle?

On Mar 19, 7:49 am, "Mr. Strat" <r...@nospam.techline.com> wrote:
> In article
> <5b877747-415e-485f-89ad-fb6fab9b5...@m44g2000hsc.googlegroups.com>,
>
> RichA <rander3...@gmail.com> wrote:
> > If you use a lens with a plastic bayonet, run your finger (or a q-tip)
> > around the rim of the lens mount. See that black stuff? That's fine,
> > black powder created by abrasion from the metal camera lens mount,
> > screw holes, etc, rubbing against the softer plastic lens mount each
> > time the lens is taken on or off the camera. That powder can and will
> > in-part end up on your sensor. This contrasts strongly with the far
> > lower wear level of metal to metal lens mounting systems. In
> > addition, the plastic powder is light and has a greater tendency to
> > float around when the lens is removed.
>
> Are you sure you're rubbing your finger around the right circle?

Lets not get vulgar.

In article
<4a5e0397-afae-4ea5-8a23-(E-Mail Removed)>,
RichA <(E-Mail Removed)> wrote:

> Lets not get vulgar.

Just pointing out yet again that you're a one-trick pony idiot.

On Mar 19, 9:46 pm, "Mr. Strat" <r...@nospam.techline.com> wrote:
> In article
> <4a5e0397-afae-4ea5-8a23-425ebb5e4...@q78g2000hsh.googlegroups.com>,
>
> RichA <rander3...@gmail.com> wrote:
> > Lets not get vulgar.
>
> Just pointing out yet again that you're a one-trick pony idiot.

What's a "pony idiot?."

On 20 Mar, 05:03, RichA <rander3...@gmail.com> wrote:
> On Mar 19, 9:46 pm, "Mr. Strat" <r...@nospam.techline.com> wrote:
>
> > In article
> > <4a5e0397-afae-4ea5-8a23-425ebb5e4...@q78g2000hsh.googlegroups.com>,
>
> > RichA <rander3...@gmail.com> wrote:
> > > Lets not get vulgar.
>
> > Just pointing out yet again that you're a one-trick pony idiot.
>
> What's a "pony idiot?."

Look in the mirror Rich. Shouldn't be too hard for you to find.

Doc

In article
<24aff3c6-f57e-403d-b22d-(E-Mail Removed)>, Dr
Hfuhruhurr <(E-Mail Removed)> wrote:

> On 20 Mar, 05:03, RichA <rander3...@gmail.com> wrote:
> > On Mar 19, 9:46 pm, "Mr. Strat" <r...@nospam.techline.com> wrote:
> >
> > > In article
> > > <4a5e0397-afae-4ea5-8a23-425ebb5e4...@q78g2000hsh.googlegroups.com>,
> >
> > > RichA <rander3...@gmail.com> wrote:
> > > > Lets not get vulgar.
> >
> > > Just pointing out yet again that you're a one-trick pony idiot.
> >
> > What's a "pony idiot?."
>
> Look in the mirror Rich. Shouldn't be too hard for you to find.

you may be overestimating his abilities.