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 such case a possible solution is to select a non-bolted option for one of the devices, if available.
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 trying
to create such an adapter.
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