Q. Build-An-Adapter says the adapter "is not possible" or "cannot be built".
A. Certain custom adapters cannot be created as a single piece. Typically custom adapters
requiring a bolted flange at both ends are not possible.
Also, if an adapter is bolted at one end the feature at the other end cannot have a diameter value
too close to the diameter of the bolt circle since this would prevent drilling the holes or installing the screws;
in both case a possible solution is to select a non-bolted option, if available for the selected device.
There are also other constraints when building a SLR/DSLR lens adapter for an astronomical
camera. Please see
this answer if you get
an error when attempting to design this kind of adapter.
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