"Julian Loke" <[EMAIL PROTECTED]> wrote:
> Wow! A cadaver Canon 1.4X tele-extender!
>
> I can think of a number of additional experiments:
>
> 1) Reverse the optical elements so that the image circle is *SMALLER*
> Why make a 0.7X vignetter? To use wide angle lenses on the EOS D30
> CMOS sensor, of course! :-) It this works, this one would *REALLY*
> popular.
I'll give this a try next weekend, but i don't think it'll work very well.
On the lens-side mount, i'll need to dremel out some plastic and the switch,
or the reversed optics wont fit through. The wide end of the optics doesn't
fit in the back of any of the lenses i have, so it can't protrude on that
side.
On the camera-side mount, it looks like the mirror will hit the protruding
optics.
> 2) Try to fit a *tiny* switch to enable/disable the extra 3 pins.
> Maybe a reed switch activated by an external magnet?
I'm not sure a magnetic switch would work. There's plenty of metal in the
TC.
I have no experience with reed switches though, it might work.
But I don't think the switch has to be that tiny. There's enough space to
fit a normal cheap small switch.
I think i could drill a hole in the metal casing, or the plastic panel that
holds the button for releasing the lens, and fit a small switch through
that. It wouldn't be very waterproof or solid or anything though.
Anyway, i've got an F4 lens, so a lobotomized 1.4x TC has no value to me.
But see my other post "Teleconvertor surgery, was Budget birder report" for
how I modified a 2x TC to make its electronics act like those of a 1.4x TC.
Martijn Stol
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