Quote:
Originally Posted by bojan
Aa a result of last night (unsuccessful) observation of Procyon B with my C11, I was thinking about building of suitable "coronograph"...
Obviously, I will need to place it in the system focal plane, and I wil have to use relay lens to project the image of the blocked star and remained star field onto the image sensor.
The blocking shade should be suspended by thin wire and it should be quite small, 10-20 pixels maybe? That is ~100um, 0.1mm..
Quite a challenge....
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Hi Bojan,
As a quick solution, For a 100 micron wide blocking shade, the wire and the shade could be one in the same thing. Just use a 100 micron wire to block the star (or whatever diam is appropriate).
Most speaker and hookup cable will have individual strands diameter in the 100 to 200 micron range. Some RF/Coax cable shields and Litz wire also use tiny wire. Silicon test lead is also a good source of <100 micron diameter wire strands. The thinnest I've noted were 50 micron diameter strands in a silicone rubber flexible cable that a friend like to use for speaker cable.
The only other solution would be to microdeposit an appropriatelty positioned 100 micron dot on glass in the optical train. Wire suspension of a 100 micron dot, would be extremely difficult since the suspending wires would be difficult to obtain in much thinner than 50microns, let alone finding a suspending a 100micron dot on the wire. Hence my suggestion to simply use a 100micron wire to obscure the star (and unfortunately of course everything else along the wire)
Best
JA